Turn raw screenshots into polished mockups with backgrounds, window chrome, 3D tilt and text — free, in your browser. Export PNG, JPEG, SVG. Updated 2026.

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.

Free online markdown previewer (2026). Drop multiple .md files, reorder them, switch between four reading themes and read continuously. Renders locally — nothing uploaded.

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.

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.

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.

Free calorie calculator for 2026. Find daily calorie targets for weight loss, maintenance and gain at sustainable rates. Uses Mifflin–St Jeor + activity multiplier.

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.

Free body fat percentage calculator using the US Navy circumference method. Tape measurements + height + sex give you body fat % within 3 % accuracy. Updated 2026.

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.

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.

Free ideal weight calculator. Compare four published formulas (Devine, Robinson, Miller, Hamwi) for your healthy weight target by height and sex. Updated 2026.

Free BSA calculator. Compute total body surface area in m² using both the DuBois (1916) and Mosteller (1987) formulas. Updated 2026.

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.

Free pregnancy calculator. Get your gestational age, due date, trimester boundaries and pregnancy milestones from LMP, conception, or ultrasound. Updated 2026.

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.

Free pregnancy conception calculator. Estimate the date of conception from your due date, last menstrual period (LMP), or current gestational age. Updated 2026.

Free ovulation calculator. Predict your ovulation day and most-fertile window from your last period and cycle length. Updated 2026.

Free conception calculator. Find your best days to conceive over the next 3 cycles based on your typical cycle and last period. Updated 2026.

Free period calculator. Predict the dates of your next 6 periods and see ovulation/fertile days for each cycle. Updated 2026.

Free running pace calculator. Solve for pace, time, or distance — supports km and miles, plus race-distance splits (5K, 10K, half, marathon). Updated 2026.

Free 1RM calculator using Epley, Brzycki, and Lombardi formulas. Estimate your one-rep max from a submaximal lift and see training percentages. Updated 2026.

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.

Free calories-burned calculator using the MET method. Estimate kcal burned for running, walking, cycling, swimming, weights, HIIT and more. Updated 2026.

Free daily protein calculator. Get a recommended grams-per-day target based on your weight and goal — sedentary, training, hypertrophy, or cutting. Updated 2026.

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.

Free dietary fat intake calculator. Get a daily g/day target from your TDEE — balanced, low-fat, low-carb, or keto. Updated 2026.

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.

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.

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.

Free body type calculator. Estimate your somatotype (ectomorph, mesomorph, endomorph) and your body shape (apple, pear, hourglass, rectangle, inverted triangle). Updated 2026.

Free educational BAC calculator using the Widmark formula. Estimate your blood alcohol content from drinks, body weight, sex, and time. Updated 2026.

Free mortgage calculator. Compute your monthly payment, total interest paid, and full amortization schedule for any home loan. Updated 2026.

Free loan calculator. Find monthly payment, total interest and amortization for personal, auto, student and business loans. Updated 2026.

Free auto loan calculator. Compute your monthly car payment with sales tax, fees, down payment and trade-in value. Updated 2026.

Free compound interest calculator. See your money grow with daily, monthly, quarterly or annual compounding. Updated 2026.

Free simple interest calculator. Compute interest, total amount, and the difference vs. compound interest. Updated 2026.

Free investment calculator. Project portfolio growth with starting balance + monthly contributions over any time horizon. Updated 2026.

Free savings calculator. Reach a savings goal with regular monthly deposits — see required contribution, total interest and time to goal. Updated 2026.

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.

Free salary calculator. Convert between annual, monthly, weekly, daily and hourly pay with custom hours-per-week. Updated 2026.

Free ROI calculator. Compute return on investment as a percentage, plus annualized ROI when you supply a holding period. Updated 2026.

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.

Free sales tax calculator. Add tax to a pre-tax price, or back-calculate the tax-exclusive price from a total. Updated 2026.

Free amortization schedule calculator. See every month's interest, principal and remaining balance for any loan. Updated 2026.

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.

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.

Free debt payoff calculator. Compare the snowball (smallest balance first) and avalanche (highest rate first) methods across multiple debts. Updated 2026.

Free rent vs. buy calculator. Compare the long-term cost of renting against buying — including mortgage, taxes, maintenance and opportunity cost. Updated 2026.

Free home affordability calculator. Find the maximum home price you can afford based on income, debts, down payment and current rates. Updated 2026.

Free budget calculator. Apply the 50/30/20 rule to your income — needs, wants, and savings — or set custom percentages. Updated 2026.

Free inflation calculator. Project future prices or compute the real purchasing power of money across years at any inflation rate. Updated 2026.

Free mortgage refinance calculator. Compare your current mortgage to a refinance and see monthly savings, break-even month and lifetime interest saved. Updated 2026.

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.

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.

Free future value calculator. Compute the future worth of a lump sum, regular deposits, or both — at any rate over any period. Updated 2026.

Free present value calculator. Compute today's worth of a future lump sum or stream of cash flows at any discount rate. Updated 2026.

Free profit margin calculator. Compute gross margin, markup, profit, or selling price from any two known values. Updated 2026.

Free sales commission calculator. Compute commission on a sale at a flat rate, plus tiered/accelerator commission on amounts above a threshold. Updated 2026.

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.

Free CD calculator. See total interest, final balance, and effective APY for any certificate of deposit term and compounding frequency. Updated 2026.

Free lease calculator. Compute monthly lease payment, total cost, and effective interest rate from price, residual value, money factor and term. Updated 2026.

Free auto lease calculator. Compute monthly car lease payment with sales tax, money factor, residual, down payment and trade-in. Updated 2026.

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.

Free payback period calculator. Compute how long it takes to recover an initial investment from periodic cash flows — even or uneven. Updated 2026.

Free IRR calculator. Compute the internal rate of return for any series of cash flows — investments, projects, real estate. Updated 2026.

Free annuity calculator. Solve for future value, present value, or payment of an annuity (regular cash flows over time). Updated 2026.

Free bond calculator. Compute bond price, yield to maturity, current yield and duration from face value, coupon, term and market rate. Updated 2026.

Free real estate investment calculator. Compute cap rate, cash-on-cash return, gross rent multiplier and NOI for any rental property. Updated 2026.

Free rental property calculator. Detailed monthly + annual cash flow with vacancy, repairs, capex, management and HOA — plus 5-year ROI projection. Updated 2026.

Free college cost calculator. Project total 4-year cost with tuition inflation and find the monthly savings needed to fund it. Updated 2026.

Free average return calculator. Compute arithmetic mean, geometric mean (CAGR), and the difference between them across any series of returns. Updated 2026.

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.

Free mutual fund calculator. Project growth net of expense ratio + load fees. See how much fees actually cost you over decades. Updated 2026.

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.

Free repayment calculator. Solve how long it takes to pay off any balance at any monthly payment, with extra-payment scenarios. Updated 2026.

Free interest rate calculator. Solve for the APR given loan amount, monthly payment and term — useful when only the payment is quoted. Updated 2026.

Free annuity payout calculator. Compute the periodic payout from any annuity balance over a fixed term or for life. Updated 2026.

Free debt consolidation calculator. Compare your existing debts against a single consolidation loan — see if consolidating saves money. Updated 2026.

Free student loan calculator. Compute monthly payment and total interest under standard, extended, and income-driven repayment scenarios. Updated 2026.

Free pension calculator. Estimate monthly pension income from years of service, final salary, and a benefit factor — for defined-benefit plans. Updated 2026.

Free home equity loan calculator. Compute maximum loan amount based on home value, mortgage balance, and lender LTV cap — plus monthly payment. Updated 2026.

Free HELOC calculator. Compute maximum credit line, draw period interest-only payments, and repayment-period principal+interest payments. Updated 2026.

Free personal loan calculator. Compute monthly payment, total interest, and impact of origination fees for unsecured personal loans. Updated 2026.

Free percentage calculator. Solve all three forms: X% of Y, X is what % of Y, and X is Y% of what. Updated 2026.

Free fraction calculator. Add, subtract, multiply or divide fractions and get simplified result + decimal equivalent. Updated 2026.

Free percent error calculator. Compute the absolute percent error between an experimental (measured) value and a theoretical (true) value. Updated 2026.

Free ratio calculator. Simplify any ratio to lowest terms, scale up or down, or solve A:B = C:? proportions. Updated 2026.

Free average calculator. Compute the arithmetic mean of any list of numbers — paste from spreadsheet or enter inline. Updated 2026.

Free calculator for mean, median, mode and range of any data set. Paste from spreadsheet or enter inline. Updated 2026.

Free circle calculator. Solve for radius, diameter, circumference and area from any one known measurement. Updated 2026.

Free area calculator. Compute the area of square, rectangle, circle, triangle, trapezoid, parallelogram, sector and more shapes. Updated 2026.

Free volume calculator. Compute volume of cube, sphere, cylinder, cone, pyramid, rectangular prism, and capsule. Updated 2026.

Free triangle solver. Compute all sides, angles, area, and perimeter from any valid combination of three known values. Updated 2026.

Free quadratic formula calculator. Solve any ax² + bx + c = 0 — real or complex roots, with discriminant and step-by-step. Updated 2026.

Free slope calculator. Compute slope, equation of the line, and angle between two points (x₁, y₁) and (x₂, y₂). Updated 2026.

Free distance calculator. Compute Euclidean distance between two points in 2D or 3D using the distance formula. Updated 2026.

Free Pythagorean theorem calculator. Solve for any side of a right triangle given the other two. Updated 2026.

Free right triangle calculator. Solve for all sides, angles and area from any two known values. Updated 2026.

Free standard deviation calculator. Compute population (σ) and sample (s) standard deviation, plus variance, mean, and range. Updated 2026.

Free exponent calculator. Compute base^exponent including negative, fractional, and decimal exponents — works for any real numbers. Updated 2026.

Free logarithm calculator. Compute log₁₀, ln (natural log), log₂, or log of any base — quickly and precisely. Updated 2026.

Free root calculator. Compute square root, cube root, and any n-th root of any number — including negative numbers (cube root only). Updated 2026.

Free random number generator. Generate one or many random numbers in any range — uses crypto.getRandomValues for true randomness. Updated 2026.

Free probability calculator. Compute single, combined (AND/OR), conditional, and complement probabilities for two events. Updated 2026.

Free z-score calculator. Compute z-score from value, mean, and standard deviation — plus probability from the normal CDF. Updated 2026.

Free confidence interval calculator. Compute the CI of a sample mean at any confidence level (90/95/99% etc.). Updated 2026.

Free p-value calculator. Compute p-value from a z-score for one-tailed (left/right) or two-tailed test. Updated 2026.

Free sample size calculator. Find the survey sample size needed for a target margin of error and confidence level. Updated 2026.

Free permutation and combination calculator. Compute nPr, nCr, and factorials for counting problems. Updated 2026.

Free GCF / GCD calculator. Find the greatest common factor of two or more numbers using the Euclidean algorithm. Updated 2026.

Free LCM calculator. Find the least common multiple of two or more integers — useful for fractions and scheduling. Updated 2026.

Free prime factorization calculator. Factor any positive integer into its prime factors with exponents. Updated 2026.

Free number sequence calculator. Generate arithmetic and geometric sequences, find n-th term and sum. Updated 2026.

Free scientific notation calculator. Convert between decimal and scientific notation, plus engineering notation and E-notation. Updated 2026.

Free rounding calculator. Round to decimal places, significant figures, or to the nearest integer / multiple. Updated 2026.

Free binary calculator. Add, subtract, multiply, divide binary numbers and convert to decimal, octal, hex. Updated 2026.

Free hex calculator. Add, subtract, multiply, divide hexadecimal and convert to decimal, octal, binary. Updated 2026.

Free half-life calculator. Solve for remaining quantity, half-life, decay constant, or elapsed time. Updated 2026.

Free surface area calculator. Compute surface area of cubes, prisms, spheres, cylinders, and cones. Updated 2026.

Free long division calculator. Divide whole numbers and see each subtraction step plus quotient and remainder. Updated 2026.

Free basic calculator with order of operations and percent support. Add, subtract, multiply, divide. Updated 2026.

Free big number calculator. Exact arithmetic on huge integers using BigInt — no rounding, no precision loss. Updated 2026.

Free statistics calculator. Mean, median, mode, range, variance, and standard deviation from any list of numbers. Updated 2026.

Free matrix calculator. Add, subtract, multiply matrices and compute determinant and transpose. Updated 2026.

Free modulo calculator. Compute the remainder a mod n for any integers, including negatives. Updated 2026.

Free factorial calculator. Compute n! exactly using BigInt — no overflow up to thousands of digits. Updated 2026.

Free mixed number calculator. Add, subtract, multiply, divide mixed numbers and convert to improper fractions. Updated 2026.

Free decimal to fraction calculator. Convert any decimal to a simplified fraction or mixed number. Updated 2026.

Free midpoint calculator. Compute the midpoint between two coordinates and the distance between them. Updated 2026.

Free perimeter calculator. Compute perimeter (or circumference) of squares, rectangles, circles, triangles, and parallelograms. Updated 2026.

Free trigonometry calculator. Compute sin, cos, tan, and their inverses in degrees or radians. Updated 2026.

Free exponential growth calculator. Project quantity over time at a constant growth rate. Updated 2026.

Free hours calculator. Find total hours and minutes between a start and end time, with optional break deduction. Updated 2026.

Free age calculator. Compute your exact age in years, months, days, hours, and minutes from your date of birth. Updated 2026.

Free date calculator. Add or subtract days, weeks, months, or years from a date. Updated 2026.

Free day counter. Count exact days, business days, and weeks between any two dates. Updated 2026.

Free day of the week calculator. Find what day of the week any date falls on — past or future. Updated 2026.

Free tip calculator. Compute tip amount, total bill, and per-person split for any percentage. Updated 2026.

Free password generator. Generate strong random passwords with custom length and character sets. Updated 2026.

Free online dice roller. Roll any number of dice with any number of sides — D4, D6, D8, D10, D12, D20, D100. Updated 2026.

Free Roman numeral converter. Convert between Arabic numbers and Roman numerals (1 to 3999). Updated 2026.

Free Base64 encoder and decoder. Convert between text and Base64 instantly. Supports UTF-8. Updated 2026.

Free URL encoder and decoder. Convert spaces and special characters to percent-encoded form. Updated 2026.

Free time zone calculator. Convert any date and time between IANA time zones with DST handled automatically. Updated 2026.

Free GPA calculator. Compute your weighted GPA on the 4.0 scale from your courses, grades, and credit hours. Updated 2026.

Free grade calculator. Compute your weighted final grade and what you need on a final exam. Updated 2026.

Free fuel cost calculator. Estimate the cost of a trip from distance, fuel economy, and fuel price. Updated 2026.

Free gas mileage calculator. Compute MPG, L/100km, and km/L from distance and fuel used. Updated 2026.

Free speed calculator. Solve for speed, distance, or time. Convert between mph, km/h, m/s, and knots. Updated 2026.

Free wind chill calculator. Compute the feels-like temperature from air temperature and wind speed using the NWS formula. Updated 2026.

Free heat index calculator. Compute the apparent temperature from air temperature and humidity using the NWS Rothfusz formula. Updated 2026.

Free dew point calculator. Compute dew point from temperature and relative humidity using the Magnus formula. Updated 2026.

Free square footage calculator. Compute floor area for rooms, lots, and projects in sq ft, sq m, and sq yd. Updated 2026.

Free tile calculator. Find how many tiles and boxes you need for any room, including waste allowance. Updated 2026.

Free mulch calculator. Compute cubic yards and bags of mulch for any garden area and depth. Updated 2026.

Free gravel calculator. Compute cubic yards, cubic meters, and tons of gravel for driveways, paths, and projects. Updated 2026.

Free concrete calculator. Compute cubic yards and bags of pre-mix concrete needed for slabs, footings, and posts. Updated 2026.

Free roofing calculator. Compute roof area, squares, and shingle bundles for any pitched roof. Updated 2026.

Free IP subnet calculator. Decode IPv4 CIDR blocks into network, broadcast, mask, and usable host range. Updated 2026.

Free Ohm's law calculator. Solve for voltage, current, resistance, or power from any two known values. Updated 2026.

Free resistor color code calculator. Decode 4-band and 5-band resistor color codes into resistance and tolerance. Updated 2026.

Free bandwidth calculator. Compute file download time, transfer speed, or required bandwidth for any size. Updated 2026.

Free time duration calculator. Compute the duration between two times in hours, minutes, and seconds. Updated 2026.

Free voltage drop calculator. Compute voltage drop in copper or aluminum wire from length, gauge, and current. Updated 2026.

Free BTU calculator. Estimate the BTUs needed to heat or cool a room from square footage and climate. Updated 2026.

Free time card calculator. Add daily clock-in/clock-out times to compute weekly hours and gross pay. Updated 2026.

Free GDP calculator. Compute nominal GDP from C+I+G+NX, real GDP from a deflator, and GDP per capita. Updated 2026.

Free horsepower calculator. Convert between HP, kW, and PS, or compute HP from torque (lb-ft) × RPM. Updated 2026.

Free engine horsepower calculator. Estimate flywheel HP from vehicle weight and quarter-mile trap speed. Updated 2026.

Free stair calculator. Compute riser height, tread depth, and stringer length from total rise and run. Updated 2026.

Free electricity cost calculator. Compute kWh and cost from device wattage and runtime per day. Updated 2026.

Free shoe size conversion. Convert between US, UK, EU, and Japanese sizes for men, women, and kids. Updated 2026.

Free mileage calculator. Compute reimbursement and trip cost from miles driven and rate per mile. Updated 2026.

Free density calculator. Solve for density, mass, or volume using ρ = m/V. Updated 2026.

Free mass calculator. Compute mass from density and volume — for solids, liquids, or gases. Updated 2026.

Free weight calculator. Compute weight (force) from mass and gravity — Earth, Moon, Mars, and more. Updated 2026.

Free molarity calculator. Compute molarity, moles, or volume from any two — or convert mass to moles using molar mass. Updated 2026.

Free molecular weight calculator. Compute molar mass from any chemical formula like H2O, C6H12O6, or NaCl. Updated 2026.

Free golf handicap calculator. Compute handicap index from up to 20 score differentials per the World Handicap System. Updated 2026.

Free sleep calculator. Find optimal bedtimes or wake-up times based on 90-minute sleep cycles. Updated 2026.

Free tire size calculator. Compute tire diameter, circumference, revs/mile, and speedometer error from any P-metric size. Updated 2026.

Free height calculator. Convert between feet/inches and centimeters with instant precision. Updated 2026.

Free unit conversion calculator. Convert length, mass, volume, temperature, and more between metric and imperial. Updated 2026.

Free paint calculator. Compute gallons of paint needed for any room from wall area, doors, windows, and number of coats. Updated 2026.

Free lumber calculator. Compute board feet, linear feet, and total cost from board dimensions. Updated 2026.

Free fence calculator. Compute posts, rails, pickets, and concrete bags for a wood fence run. Updated 2026.

Free plant spacing calculator. Find how many plants fit a garden bed at a given spacing using a triangular or square grid. Updated 2026.

Free boiling point calculator. Find the boiling point of water at any altitude using barometric pressure. Updated 2026.