Everyday Tools
Free everyday utilities — date math, age and day counters, password generation, dice rolling, base64 and URL encoding, roman numerals, tip splitting and more. Everything runs in your browser.
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.