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 years, months, weeks and days from a date, or find the time between two dates in years, months and days.
Time Calculator
Convert a time value between seconds, minutes, hours, days, weeks, months and years.
Hours Calculator
Calculate total hours between two clock times, minus breaks.
GPA Calculator
Work out a term or cumulative GPA on a 4.0 scale, or a weighted GPA with Honors and AP/IB bonuses, from each course's letter grade and credits.
Grade Calculator
Calculate your weighted course grade and letter grade, or the score you need on the final exam.
Height Calculator
Convert a height between feet and inches, centimeters and meters, or get a rough estimate of a child's adult height from the parents' heights.
Concrete Calculator
Calculate the concrete volume and bag count for a slab, footing, round column, tube or solid stairs.
IP Subnet Calculator
Subnet an IPv4 or IPv6 address in CIDR notation: network, address range, mask and host or address count.
Bra Size Calculator
Estimate US, UK and EU bra sizes from underbust and bust measurements, by the two common band methods.
Password Generator
Generate random passwords in your browser with a custom length and character sets.
Dice Roller
Roll 1 to 20 standard or custom dice with a modifier and see each face, the total and the possible range.
Conversion Calculator
Convert units of length, weight, volume, area, speed, temperature, energy, pressure and time between metric and US measures.
Fuel Cost Calculator
Work out the fuel or electricity a trip uses and its cost, from MPG, L/100 km, km/L, kWh/100 mi or mi/kWh and the price.
Voltage Drop Calculator
Estimate single-phase, DC or three-phase voltage drop in a wire from current, length and AWG size.
BTU Calculator
Estimate the BTU and AC tons for a room from its floor area, sun exposure and ceiling height.
Square Footage Calculator
Find the area of a rectangle, triangle, circle or trapezoid in square feet and square meters, with flooring cost, waste and boxes.
Time Card Calculator
Calculate weekly work hours and pay from daily time-card entries.
Time Zone Calculator
Convert a date and time from one city to 20 world cities, with daylight saving time applied for the date you pick.
Love Calculator
Turn two names into a score from 0 to 100%, for fun only. It predicts nothing.
GDP Calculator
Calculate GDP from C + I + G + (X − M), then real GDP and GDP per capita.
Gas Mileage Calculator
Calculate US MPG, UK MPG, km/L and L/100 km from one trip in US gallons, UK gallons or liters, with fuel cost per mile or km.
Horsepower Calculator
Find horsepower from torque and RPM or torque from horsepower, convert kW and HP, and work out power from force and velocity.
Engine Horsepower Calculator
Estimate quarter-mile ET and trap speed from power and weight, or engine horsepower from weight and ET or trap speed.
Stair Calculator
Find the number of risers, riser height, total run and stringer length for a straight staircase.
Resistor Calculator
Decode resistor color bands or find the color code for a resistance value.
Ohm's Law Calculator
Enter any two of voltage, current, resistance and power to get the other two, including watts to amps and amps to watts.
Electricity Calculator
Calculate the electricity cost of any appliance.
Shoe Size Conversion
Convert adult and kids' shoe sizes between US, UK, EU, CM / JP and AU on Nike's charts, or find a size from a foot length.
Tip Calculator
Calculate tip amount and split the bill among any number of people.
Mileage Calculator
Work out the fuel used, fuel cost, driving time and an optional reimbursement for one trip.
Density Calculator
Solve ρ = m / V for density, mass, or volume in g/cm³, kg/m³ or lb/ft³.
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 molarity from solute mass, molar mass and volume, or the grams of solute for a target molarity.
Molecular Weight Calculator
Get the molar mass of a chemical formula in g/mol and its percent composition by element, with brackets and hydrates, for the 84 elements with a standard atomic weight.
Roman Numeral Converter
Convert whole numbers from 1 to 3,999,999 to Roman numerals, with bars from 4,000 up, and standard Roman numerals back to numbers.
Golf Handicap Calculator
Work out your Handicap Index and Course Handicap from 3 to 20 rounds under the World Handicap System.
Sleep Calculator
Find bedtimes or wake-up times for 4, 5 or 6 sleep cycles of 90 minutes, with 15 minutes to fall asleep.
Tire Size Calculator
Compare two tire sizes and see the difference in diameter and speedometer reading.
Roofing Calculator
Find the roof area from the footprint and pitch, then roofing squares and shingle bundles.
Tile Calculator
Calculate the number of tiles needed for any room, with your own waste percentage.
Mulch Calculator
Calculate how much mulch you need for your garden or landscaping.
Gravel Calculator
Work out gravel volume in cubic yards, feet and meters, its weight in tons, the number of bags and the cost at your price.
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
Get the download time for a file at a connection speed or the speed a file needs to arrive within a set time. Or turn an average speed and daily hours of use into data per month, checked against an optional data cap.
Base64 Encode / Decode
Encode UTF-8 text to Base64 or base64url and decode it back, decode a JWT without verifying it, or turn Base64 into an image.
URL Encode / Decode
URL percent-encode or decode any string.
Time Duration Calculator
Add two times in hours, minutes and seconds, subtract one from the other, or add hours to a clock time or take them off it.
Day Counter
Count the days between two dates, with weeks, months and weekdays, or add or subtract days from a date.
Day of the Week Calculator
Find what day of the week any date falls on.