Other Calculators
Age, date, time, conversions, and everyday tools. Browse all 54 free other calculators below.
Age Calculator
Calculate your exact age in years, months, days, and hours.
Date Calculator
Add or subtract days from a date, or find the difference between two dates.
Time Calculator
Add or subtract times and compute time differences.
Hours Calculator
Calculate total hours between two clock times, minus breaks.
GPA Calculator
Calculate your cumulative GPA from your courses and grades.
Grade Calculator
Calculate your final grade or what you need on the final exam.
Height Calculator
Predict a child's adult height from parents' heights.}
Concrete Calculator
Calculate concrete volume needed for slabs, columns, stairs, and more.
IP Subnet Calculator
Calculate IPv4/IPv6 subnet information from an IP address and mask.
Bra Size Calculator
Find your correct bra size from band and bust measurements.
Password Generator
Generate strong, random passwords with custom length and character sets.
Dice Roller
Roll any number and type of dice — d4, d6, d8, d10, d12, d20.
Conversion Calculator
Convert units of length, weight, volume, temperature, speed, and more.
Fuel Cost Calculator
Estimate the fuel cost for any trip based on distance and gas price.
Voltage Drop Calculator
Calculate voltage drop in a wire based on current, length, and AWG size.
BTU Calculator
Find the right HVAC BTU capacity for your room size and climate.
Square Footage Calculator
Calculate area in square feet and estimate material costs.
Time Card Calculator
Calculate weekly work hours and pay from daily time-card entries.
Time Zone Calculator
Convert times between any two time zones.
Love Calculator
Find out your love compatibility score — just for fun!
GDP Calculator
Calculate GDP using the expenditure or income approach.
Gas Mileage Calculator
Calculate your MPG or L/100km fuel efficiency from a trip.
Horsepower Calculator
Calculate horsepower from torque and RPM or quarter-mile performance.
Engine Horsepower Calculator
Estimate engine horsepower from elapsed time and trap speed.
Stair Calculator
Calculate stair rise, run, and stringer length for a perfect staircase.
Resistor Calculator
Decode resistor color bands or find the color code for a resistance value.
Ohms Law Calculator
Solve Ohm's law (V=IR) for voltage, current, resistance, or power.
Electricity Calculator
Calculate the electricity cost of any appliance.
Shoe Size Conversion
Convert shoe sizes between US, UK, EU, Japanese, and Australian sizing.
Tip Calculator
Calculate tip amount and split the bill among any number of people.
Mileage Calculator
Estimate driving distance, time, and fuel cost between two places.
Density Calculator
Solve ρ = m / V for density, mass, or volume.
Mass Calculator
Calculate mass from density and volume, or from weight and gravity.
Weight Calculator
Calculate weight (force) from mass and gravitational acceleration.
Speed Calculator
Solve v = d / t for speed, distance, or time.
Molarity Calculator
Calculate solution molarity from solute mass, molar mass, and volume.
Molecular Weight Calculator
Calculate the molar mass of any chemical formula.
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers.
Golf Handicap Calculator
Calculate your USGA golf handicap index from recent rounds.
Sleep Calculator
Find the optimal bedtime or wake-up time based on 90-minute sleep cycles.
Tire Size Calculator
Compare two tire sizes and see the difference in diameter and speedometer reading.
Roofing Calculator
Estimate roofing materials and cost for your home.
Tile Calculator
Calculate the number of tiles needed for any room with wastage factor.
Mulch Calculator
Calculate how much mulch you need for your garden or landscaping.
Gravel Calculator
Calculate gravel volume, weight, and cost for any project.
Wind Chill Calculator
Calculate the "feels like" temperature in cold, windy conditions.
Heat Index Calculator
Calculate the "feels like" temperature when it's hot and humid.
Dew Point Calculator
Calculate the dew point from temperature and relative humidity.
Bandwidth Calculator
Calculate data transfer time, required bandwidth, or monthly usage.
Base64 Encode / Decode
Encode or decode any text to/from Base64 format.
URL Encode / Decode
URL percent-encode or decode any string.
Time Duration Calculator
Calculate the exact time elapsed between two date-times.
Day Counter
Count days, weeks, and months between two dates.
Day of the Week Calculator
Find what day of the week any date falls on.