Screenshot Mockup
Turn raw screenshots into polished mockups with backgrounds, window chrome, 3D tilt and text — free, in your browser. Export PNG, JPEG, SVG. Updated 2026.
App Icon Generator
Free app icon generator for 2026. Drop one icon, get every size for iOS, macOS, Android, Chrome and the favicon set — packaged as a ZIP. No upload, runs in-browser.
Markdown Preview
Free online markdown previewer (2026). Drop multiple .md files, reorder them, switch between four reading themes and read continuously. Renders locally — nothing uploaded.
BMI Calculator
Free BMI calculator for 2026. Enter your height and weight in metric or imperial units to see your Body Mass Index, healthy weight range and category — instantly, in your browser.
BMR Calculator
Free BMR calculator using the Mifflin–St Jeor equation. Enter your height, weight, age and sex to find how many calories your body burns at rest. Updated 2026.
TDEE Calculator
Free TDEE calculator. Find how many calories you burn per day at your activity level using Mifflin–St Jeor BMR plus an activity multiplier. Updated 2026.
Calorie Calculator
Free calorie calculator for 2026. Find daily calorie targets for weight loss, maintenance and gain at sustainable rates. Uses Mifflin–St Jeor + activity multiplier.
Macro Calculator
Free macro calculator. Enter your stats and pick a split (Balanced, Low fat, Low carb, High protein, Keto) to get your daily protein, carbs and fat in grams. Updated 2026.
Body Fat Calculator
Free body fat percentage calculator using the US Navy circumference method. Tape measurements + height + sex give you body fat % within 3 % accuracy. Updated 2026.
Army Body Fat Calculator
Free Army body fat calculator using the AR 600-9 circumference method. Enter your tape measurements and see whether you fall within Army standards for your age and sex. Updated 2026.
Lean Body Mass Calculator
Free lean body mass calculator using the Boer formula. Estimate the mass of muscle, bone, organs and water in your body — everything that isn't fat. Updated 2026.
Ideal Weight Calculator
Free ideal weight calculator. Compare four published formulas (Devine, Robinson, Miller, Hamwi) for your healthy weight target by height and sex. Updated 2026.
Body Surface Area Calculator
Free BSA calculator. Compute total body surface area in m² using both the DuBois (1916) and Mosteller (1987) formulas. Updated 2026.
Due Date Calculator
Free pregnancy due date calculator using Naegele's rule. Enter your last menstrual period (LMP) to estimate your baby's due date and trimester milestones. Updated 2026.
Pregnancy Calculator
Free pregnancy calculator. Get your gestational age, due date, trimester boundaries and pregnancy milestones from LMP, conception, or ultrasound. Updated 2026.
Pregnancy Weight Gain Calculator
Free pregnancy weight gain calculator based on IOM/NAM guidelines. Get a recommended total gain and weekly target tailored to your pre-pregnancy BMI. Updated 2026.
Pregnancy Conception Calculator
Free pregnancy conception calculator. Estimate the date of conception from your due date, last menstrual period (LMP), or current gestational age. Updated 2026.
Ovulation Calculator
Free ovulation calculator. Predict your ovulation day and most-fertile window from your last period and cycle length. Updated 2026.
Conception Calculator
Free conception calculator. Find your best days to conceive over the next 3 cycles based on your typical cycle and last period. Updated 2026.
Period Calculator
Free period calculator. Predict the dates of your next 6 periods and see ovulation/fertile days for each cycle. Updated 2026.
Pace Calculator
Free running pace calculator. Solve for pace, time, or distance — supports km and miles, plus race-distance splits (5K, 10K, half, marathon). Updated 2026.
One Rep Max Calculator
Free 1RM calculator using Epley, Brzycki, and Lombardi formulas. Estimate your one-rep max from a submaximal lift and see training percentages. Updated 2026.
Target Heart Rate Calculator
Free target heart rate calculator. Get your max heart rate (Tanaka formula) and the 5 training zones for fat burn, endurance, tempo, threshold, and VO₂ max. Updated 2026.
Calories Burned Calculator
Free calories-burned calculator using the MET method. Estimate kcal burned for running, walking, cycling, swimming, weights, HIIT and more. Updated 2026.
Protein Calculator
Free daily protein calculator. Get a recommended grams-per-day target based on your weight and goal — sedentary, training, hypertrophy, or cutting. Updated 2026.
Carbohydrate Calculator
Free daily carbohydrate intake calculator. Get a g/day target based on your TDEE, training volume and goal — endurance, strength, low-carb or keto. Updated 2026.
Fat Intake Calculator
Free dietary fat intake calculator. Get a daily g/day target from your TDEE — balanced, low-fat, low-carb, or keto. Updated 2026.
Healthy Weight Calculator
Free healthy weight calculator. Find the weight range that puts you in the BMI 18.5–24.9 'healthy' band for your height. Updated 2026.
Overweight Calculator
Free overweight calculator. Find out how many kg or lb above the healthy BMI band you are, and see realistic timelines to reach BMI 24.9. Updated 2026.
GFR Calculator
Free GFR calculator using CKD-EPI 2021 (race-free) — the current ASN/NKF standard for kidney function. Returns eGFR in mL/min/1.73 m² with CKD stage. Updated 2026.
Body Type Calculator
Free body type calculator. Estimate your somatotype (ectomorph, mesomorph, endomorph) and your body shape (apple, pear, hourglass, rectangle, inverted triangle). Updated 2026.
BAC Calculator
Free educational BAC calculator using the Widmark formula. Estimate your blood alcohol content from drinks, body weight, sex, and time. Updated 2026.
Mortgage Calculator
Free mortgage calculator. Compute your monthly payment, total interest paid, and full amortization schedule for any home loan. Updated 2026.
Loan Calculator
Free loan calculator. Find monthly payment, total interest and amortization for personal, auto, student and business loans. Updated 2026.
Auto Loan Calculator
Free auto loan calculator. Compute your monthly car payment with sales tax, fees, down payment and trade-in value. Updated 2026.
Compound Interest Calculator
Free compound interest calculator. See your money grow with daily, monthly, quarterly or annual compounding. Updated 2026.
Simple Interest Calculator
Free simple interest calculator. Compute interest, total amount, and the difference vs. compound interest. Updated 2026.
Investment Calculator
Free investment calculator. Project portfolio growth with starting balance + monthly contributions over any time horizon. Updated 2026.
Savings Calculator
Free savings calculator. Reach a savings goal with regular monthly deposits — see required contribution, total interest and time to goal. Updated 2026.
Retirement Calculator
Free retirement calculator. Project your nest egg, see if you're on track, and find the monthly contribution needed to reach your goal. Updated 2026.
Salary Calculator
Free salary calculator. Convert between annual, monthly, weekly, daily and hourly pay with custom hours-per-week. Updated 2026.
ROI Calculator
Free ROI calculator. Compute return on investment as a percentage, plus annualized ROI when you supply a holding period. Updated 2026.
Discount Calculator
Free discount calculator. Find the sale price after a percent-off discount, or work out the actual percent off from before/after prices. Updated 2026.
Sales Tax Calculator
Free sales tax calculator. Add tax to a pre-tax price, or back-calculate the tax-exclusive price from a total. Updated 2026.
Amortization Calculator
Free amortization schedule calculator. See every month's interest, principal and remaining balance for any loan. Updated 2026.
Mortgage Payoff Calculator
Free mortgage payoff calculator. See how much you save in interest and how many years you cut off your loan with extra principal payments. Updated 2026.
Credit Card Payoff Calculator
Free credit card payoff calculator. See how long it takes to pay off a balance and how much interest you'll pay at any monthly payment level. Updated 2026.
Debt Payoff Calculator
Free debt payoff calculator. Compare the snowball (smallest balance first) and avalanche (highest rate first) methods across multiple debts. Updated 2026.
Rent vs. Buy Calculator
Free rent vs. buy calculator. Compare the long-term cost of renting against buying — including mortgage, taxes, maintenance and opportunity cost. Updated 2026.
House Affordability Calculator
Free home affordability calculator. Find the maximum home price you can afford based on income, debts, down payment and current rates. Updated 2026.
Budget Calculator
Free budget calculator. Apply the 50/30/20 rule to your income — needs, wants, and savings — or set custom percentages. Updated 2026.
Inflation Calculator
Free inflation calculator. Project future prices or compute the real purchasing power of money across years at any inflation rate. Updated 2026.
Refinance Calculator
Free mortgage refinance calculator. Compare your current mortgage to a refinance and see monthly savings, break-even month and lifetime interest saved. Updated 2026.
APR Calculator
Free APR calculator. Convert a quoted interest rate plus fees into the true Annual Percentage Rate — the apples-to-apples loan comparison number. Updated 2026.
Down Payment Calculator
Free down payment calculator. Find the down payment amount needed and how long it takes to save it from current savings + monthly contributions. Updated 2026.
Future Value Calculator
Free future value calculator. Compute the future worth of a lump sum, regular deposits, or both — at any rate over any period. Updated 2026.
Present Value Calculator
Free present value calculator. Compute today's worth of a future lump sum or stream of cash flows at any discount rate. Updated 2026.
Margin Calculator
Free profit margin calculator. Compute gross margin, markup, profit, or selling price from any two known values. Updated 2026.
Commission Calculator
Free sales commission calculator. Compute commission on a sale at a flat rate, plus tiered/accelerator commission on amounts above a threshold. Updated 2026.
Debt-to-Income Ratio Calculator
Free debt-to-income ratio (DTI) calculator. Compute front-end and back-end ratios — what lenders use to qualify mortgages, auto loans, and personal loans. Updated 2026.
CD Calculator
Free CD calculator. See total interest, final balance, and effective APY for any certificate of deposit term and compounding frequency. Updated 2026.
Lease Calculator
Free lease calculator. Compute monthly lease payment, total cost, and effective interest rate from price, residual value, money factor and term. Updated 2026.
Auto Lease Calculator
Free auto lease calculator. Compute monthly car lease payment with sales tax, money factor, residual, down payment and trade-in. Updated 2026.
Depreciation Calculator
Free depreciation calculator. Compute asset depreciation using straight-line, declining-balance, or sum-of-years-digits methods with a year-by-year schedule. Updated 2026.
Payback Period Calculator
Free payback period calculator. Compute how long it takes to recover an initial investment from periodic cash flows — even or uneven. Updated 2026.
IRR Calculator
Free IRR calculator. Compute the internal rate of return for any series of cash flows — investments, projects, real estate. Updated 2026.
Annuity Calculator
Free annuity calculator. Solve for future value, present value, or payment of an annuity (regular cash flows over time). Updated 2026.
Bond Calculator
Free bond calculator. Compute bond price, yield to maturity, current yield and duration from face value, coupon, term and market rate. Updated 2026.
Real Estate Calculator
Free real estate investment calculator. Compute cap rate, cash-on-cash return, gross rent multiplier and NOI for any rental property. Updated 2026.
Rental Property Calculator
Free rental property calculator. Detailed monthly + annual cash flow with vacancy, repairs, capex, management and HOA — plus 5-year ROI projection. Updated 2026.
College Cost Calculator
Free college cost calculator. Project total 4-year cost with tuition inflation and find the monthly savings needed to fund it. Updated 2026.
Average Return Calculator
Free average return calculator. Compute arithmetic mean, geometric mean (CAGR), and the difference between them across any series of returns. Updated 2026.
Cash Back or Low Interest Calculator
Free auto rebate calculator. Compare a cash-back rebate at standard APR against a manufacturer's low/0% APR financing — see which saves more total. Updated 2026.
Mutual Fund Calculator
Free mutual fund calculator. Project growth net of expense ratio + load fees. See how much fees actually cost you over decades. Updated 2026.
VAT Calculator
Free VAT calculator. Add VAT to a net price or back-calculate the net amount from a gross total. Works for any country's VAT rate. Updated 2026.
Repayment Calculator
Free repayment calculator. Solve how long it takes to pay off any balance at any monthly payment, with extra-payment scenarios. Updated 2026.
Interest Rate Calculator
Free interest rate calculator. Solve for the APR given loan amount, monthly payment and term — useful when only the payment is quoted. Updated 2026.
Annuity Payout Calculator
Free annuity payout calculator. Compute the periodic payout from any annuity balance over a fixed term or for life. Updated 2026.
Debt Consolidation Calculator
Free debt consolidation calculator. Compare your existing debts against a single consolidation loan — see if consolidating saves money. Updated 2026.
Student Loan Calculator
Free student loan calculator. Compute monthly payment and total interest under standard, extended, and income-driven repayment scenarios. Updated 2026.
Pension Calculator
Free pension calculator. Estimate monthly pension income from years of service, final salary, and a benefit factor — for defined-benefit plans. Updated 2026.
Home Equity Loan Calculator
Free home equity loan calculator. Compute maximum loan amount based on home value, mortgage balance, and lender LTV cap — plus monthly payment. Updated 2026.
HELOC Calculator
Free HELOC calculator. Compute maximum credit line, draw period interest-only payments, and repayment-period principal+interest payments. Updated 2026.
Personal Loan Calculator
Free personal loan calculator. Compute monthly payment, total interest, and impact of origination fees for unsecured personal loans. Updated 2026.
Percentage Calculator
Free percentage calculator. Solve all three forms: X% of Y, X is what % of Y, and X is Y% of what. Updated 2026.
Fraction Calculator
Free fraction calculator. Add, subtract, multiply or divide fractions and get simplified result + decimal equivalent. Updated 2026.
Percent Error Calculator
Free percent error calculator. Compute the absolute percent error between an experimental (measured) value and a theoretical (true) value. Updated 2026.
Ratio Calculator
Free ratio calculator. Simplify any ratio to lowest terms, scale up or down, or solve A:B = C:? proportions. Updated 2026.
Average Calculator
Free average calculator. Compute the arithmetic mean of any list of numbers — paste from spreadsheet or enter inline. Updated 2026.
Mean, Median, Mode & Range Calculator
Free calculator for mean, median, mode and range of any data set. Paste from spreadsheet or enter inline. Updated 2026.
Circle Calculator
Free circle calculator. Solve for radius, diameter, circumference and area from any one known measurement. Updated 2026.
Area Calculator
Free area calculator. Compute the area of square, rectangle, circle, triangle, trapezoid, parallelogram, sector and more shapes. Updated 2026.
Volume Calculator
Free volume calculator. Compute volume of cube, sphere, cylinder, cone, pyramid, rectangular prism, and capsule. Updated 2026.
Triangle Calculator
Free triangle solver. Compute all sides, angles, area, and perimeter from any valid combination of three known values. Updated 2026.
Quadratic Formula Calculator
Free quadratic formula calculator. Solve any ax² + bx + c = 0 — real or complex roots, with discriminant and step-by-step. Updated 2026.
Slope Calculator
Free slope calculator. Compute slope, equation of the line, and angle between two points (x₁, y₁) and (x₂, y₂). Updated 2026.
Distance Calculator
Free distance calculator. Compute Euclidean distance between two points in 2D or 3D using the distance formula. Updated 2026.
Pythagorean Theorem Calculator
Free Pythagorean theorem calculator. Solve for any side of a right triangle given the other two. Updated 2026.
Right Triangle Calculator
Free right triangle calculator. Solve for all sides, angles and area from any two known values. Updated 2026.
Standard Deviation Calculator
Free standard deviation calculator. Compute population (σ) and sample (s) standard deviation, plus variance, mean, and range. Updated 2026.
Exponent Calculator
Free exponent calculator. Compute base^exponent including negative, fractional, and decimal exponents — works for any real numbers. Updated 2026.
Log Calculator
Free logarithm calculator. Compute log₁₀, ln (natural log), log₂, or log of any base — quickly and precisely. Updated 2026.
Root Calculator
Free root calculator. Compute square root, cube root, and any n-th root of any number — including negative numbers (cube root only). Updated 2026.
Random Number Generator
Free random number generator. Generate one or many random numbers in any range — uses crypto.getRandomValues for true randomness. Updated 2026.
Probability Calculator
Free probability calculator. Compute single, combined (AND/OR), conditional, and complement probabilities for two events. Updated 2026.
Z-Score Calculator
Free z-score calculator. Compute z-score from value, mean, and standard deviation — plus probability from the normal CDF. Updated 2026.
Confidence Interval Calculator
Free confidence interval calculator. Compute the CI of a sample mean at any confidence level (90/95/99% etc.). Updated 2026.
P-Value Calculator
Free p-value calculator. Compute p-value from a z-score for one-tailed (left/right) or two-tailed test. Updated 2026.
Sample Size Calculator
Free sample size calculator. Find the survey sample size needed for a target margin of error and confidence level. Updated 2026.
Permutation & Combination Calculator
Free permutation and combination calculator. Compute nPr, nCr, and factorials for counting problems. Updated 2026.
Greatest Common Factor Calculator
Free GCF / GCD calculator. Find the greatest common factor of two or more numbers using the Euclidean algorithm. Updated 2026.
Least Common Multiple Calculator
Free LCM calculator. Find the least common multiple of two or more integers — useful for fractions and scheduling. Updated 2026.
Prime Factorization Calculator
Free prime factorization calculator. Factor any positive integer into its prime factors with exponents. Updated 2026.
Number Sequence Calculator
Free number sequence calculator. Generate arithmetic and geometric sequences, find n-th term and sum. Updated 2026.
Scientific Notation Calculator
Free scientific notation calculator. Convert between decimal and scientific notation, plus engineering notation and E-notation. Updated 2026.
Rounding Calculator
Free rounding calculator. Round to decimal places, significant figures, or to the nearest integer / multiple. Updated 2026.
Binary Calculator
Free binary calculator. Add, subtract, multiply, divide binary numbers and convert to decimal, octal, hex. Updated 2026.
Hex Calculator
Free hex calculator. Add, subtract, multiply, divide hexadecimal and convert to decimal, octal, binary. Updated 2026.
Half-Life Calculator
Free half-life calculator. Solve for remaining quantity, half-life, decay constant, or elapsed time. Updated 2026.
Surface Area Calculator
Free surface area calculator. Compute surface area of cubes, prisms, spheres, cylinders, and cones. Updated 2026.
Long Division Calculator
Free long division calculator. Divide whole numbers and see each subtraction step plus quotient and remainder. Updated 2026.
Basic Calculator
Free basic calculator with order of operations and percent support. Add, subtract, multiply, divide. Updated 2026.
Big Number Calculator
Free big number calculator. Exact arithmetic on huge integers using BigInt — no rounding, no precision loss. Updated 2026.
Statistics Calculator
Free statistics calculator. Mean, median, mode, range, variance, and standard deviation from any list of numbers. Updated 2026.
Matrix Calculator
Free matrix calculator. Add, subtract, multiply matrices and compute determinant and transpose. Updated 2026.
Modulo Calculator
Free modulo calculator. Compute the remainder a mod n for any integers, including negatives. Updated 2026.
Factorial Calculator
Free factorial calculator. Compute n! exactly using BigInt — no overflow up to thousands of digits. Updated 2026.
Mixed Number Calculator
Free mixed number calculator. Add, subtract, multiply, divide mixed numbers and convert to improper fractions. Updated 2026.
Decimal to Fraction Calculator
Free decimal to fraction calculator. Convert any decimal to a simplified fraction or mixed number. Updated 2026.
Midpoint Calculator
Free midpoint calculator. Compute the midpoint between two coordinates and the distance between them. Updated 2026.
Perimeter Calculator
Free perimeter calculator. Compute perimeter (or circumference) of squares, rectangles, circles, triangles, and parallelograms. Updated 2026.
Trigonometry Calculator
Free trigonometry calculator. Compute sin, cos, tan, and their inverses in degrees or radians. Updated 2026.
Exponential Growth Calculator
Free exponential growth calculator. Project quantity over time at a constant growth rate. Updated 2026.
Hours Calculator
Free hours calculator. Find total hours and minutes between a start and end time, with optional break deduction. Updated 2026.
Age Calculator
Free age calculator. Compute your exact age in years, months, days, hours, and minutes from your date of birth. Updated 2026.
Date Calculator
Free date calculator. Add or subtract days, weeks, months, or years from a date. Updated 2026.
Day Counter
Free day counter. Count exact days, business days, and weeks between any two dates. Updated 2026.
Day of the Week Calculator
Free day of the week calculator. Find what day of the week any date falls on — past or future. Updated 2026.
Tip Calculator
Free tip calculator. Compute tip amount, total bill, and per-person split for any percentage. Updated 2026.
Password Generator
Free password generator. Generate strong random passwords with custom length and character sets. Updated 2026.
Dice Roller
Free online dice roller. Roll any number of dice with any number of sides — D4, D6, D8, D10, D12, D20, D100. Updated 2026.
Roman Numeral Converter
Free Roman numeral converter. Convert between Arabic numbers and Roman numerals (1 to 3999). Updated 2026.
Base64 Encode / Decode
Free Base64 encoder and decoder. Convert between text and Base64 instantly. Supports UTF-8. Updated 2026.
URL Encode / Decode
Free URL encoder and decoder. Convert spaces and special characters to percent-encoded form. Updated 2026.
Time Zone Calculator
Free time zone calculator. Convert any date and time between IANA time zones with DST handled automatically. Updated 2026.
GPA Calculator
Free GPA calculator. Compute your weighted GPA on the 4.0 scale from your courses, grades, and credit hours. Updated 2026.
Grade Calculator
Free grade calculator. Compute your weighted final grade and what you need on a final exam. Updated 2026.
Fuel Cost Calculator
Free fuel cost calculator. Estimate the cost of a trip from distance, fuel economy, and fuel price. Updated 2026.
Gas Mileage Calculator
Free gas mileage calculator. Compute MPG, L/100km, and km/L from distance and fuel used. Updated 2026.
Speed Calculator
Free speed calculator. Solve for speed, distance, or time. Convert between mph, km/h, m/s, and knots. Updated 2026.
Wind Chill Calculator
Free wind chill calculator. Compute the feels-like temperature from air temperature and wind speed using the NWS formula. Updated 2026.
Heat Index Calculator
Free heat index calculator. Compute the apparent temperature from air temperature and humidity using the NWS Rothfusz formula. Updated 2026.
Dew Point Calculator
Free dew point calculator. Compute dew point from temperature and relative humidity using the Magnus formula. Updated 2026.
Square Footage Calculator
Free square footage calculator. Compute floor area for rooms, lots, and projects in sq ft, sq m, and sq yd. Updated 2026.
Tile Calculator
Free tile calculator. Find how many tiles and boxes you need for any room, including waste allowance. Updated 2026.
Mulch Calculator
Free mulch calculator. Compute cubic yards and bags of mulch for any garden area and depth. Updated 2026.
Gravel Calculator
Free gravel calculator. Compute cubic yards, cubic meters, and tons of gravel for driveways, paths, and projects. Updated 2026.
Concrete Calculator
Free concrete calculator. Compute cubic yards and bags of pre-mix concrete needed for slabs, footings, and posts. Updated 2026.
Roofing Calculator
Free roofing calculator. Compute roof area, squares, and shingle bundles for any pitched roof. Updated 2026.
IP Subnet Calculator
Free IP subnet calculator. Decode IPv4 CIDR blocks into network, broadcast, mask, and usable host range. Updated 2026.
Ohm's Law Calculator
Free Ohm's law calculator. Solve for voltage, current, resistance, or power from any two known values. Updated 2026.
Resistor Color Code Calculator
Free resistor color code calculator. Decode 4-band and 5-band resistor color codes into resistance and tolerance. Updated 2026.
Bandwidth Calculator
Free bandwidth calculator. Compute file download time, transfer speed, or required bandwidth for any size. Updated 2026.
Time Duration Calculator
Free time duration calculator. Compute the duration between two times in hours, minutes, and seconds. Updated 2026.
Voltage Drop Calculator
Free voltage drop calculator. Compute voltage drop in copper or aluminum wire from length, gauge, and current. Updated 2026.
BTU Calculator
Free BTU calculator. Estimate the BTUs needed to heat or cool a room from square footage and climate. Updated 2026.
Time Card Calculator
Free time card calculator. Add daily clock-in/clock-out times to compute weekly hours and gross pay. Updated 2026.
GDP Calculator
Free GDP calculator. Compute nominal GDP from C+I+G+NX, real GDP from a deflator, and GDP per capita. Updated 2026.
Horsepower Calculator
Free horsepower calculator. Convert between HP, kW, and PS, or compute HP from torque (lb-ft) × RPM. Updated 2026.
Engine Horsepower Calculator
Free engine horsepower calculator. Estimate flywheel HP from vehicle weight and quarter-mile trap speed. Updated 2026.
Stair Calculator
Free stair calculator. Compute riser height, tread depth, and stringer length from total rise and run. Updated 2026.
Electricity Cost Calculator
Free electricity cost calculator. Compute kWh and cost from device wattage and runtime per day. Updated 2026.
Shoe Size Conversion
Free shoe size conversion. Convert between US, UK, EU, and Japanese sizes for men, women, and kids. Updated 2026.
Mileage Calculator
Free mileage calculator. Compute reimbursement and trip cost from miles driven and rate per mile. Updated 2026.
Density Calculator
Free density calculator. Solve for density, mass, or volume using ρ = m/V. Updated 2026.
Mass Calculator
Free mass calculator. Compute mass from density and volume — for solids, liquids, or gases. Updated 2026.
Weight Calculator
Free weight calculator. Compute weight (force) from mass and gravity — Earth, Moon, Mars, and more. Updated 2026.
Molarity Calculator
Free molarity calculator. Compute molarity, moles, or volume from any two — or convert mass to moles using molar mass. Updated 2026.
Molecular Weight Calculator
Free molecular weight calculator. Compute molar mass from any chemical formula like H2O, C6H12O6, or NaCl. Updated 2026.
Golf Handicap Calculator
Free golf handicap calculator. Compute handicap index from up to 20 score differentials per the World Handicap System. Updated 2026.
Sleep Calculator
Free sleep calculator. Find optimal bedtimes or wake-up times based on 90-minute sleep cycles. Updated 2026.
Tire Size Calculator
Free tire size calculator. Compute tire diameter, circumference, revs/mile, and speedometer error from any P-metric size. Updated 2026.
Height Calculator
Free height calculator. Convert between feet/inches and centimeters with instant precision. Updated 2026.
Unit Conversion Calculator
Free unit conversion calculator. Convert length, mass, volume, temperature, and more between metric and imperial. Updated 2026.
Paint Calculator
Free paint calculator. Compute gallons of paint needed for any room from wall area, doors, windows, and number of coats. Updated 2026.
Lumber Board Foot Calculator
Free lumber calculator. Compute board feet, linear feet, and total cost from board dimensions. Updated 2026.
Fence Calculator
Free fence calculator. Compute posts, rails, pickets, and concrete bags for a wood fence run. Updated 2026.
Plant Spacing Calculator
Free plant spacing calculator. Find how many plants fit a garden bed at a given spacing using a triangular or square grid. Updated 2026.
Boiling Point Calculator
Free boiling point calculator. Find the boiling point of water at any altitude using barometric pressure. Updated 2026.