Misc Calculators

Convert a dog's age to human-equivalent years using a logarithmic formula.

Convert between common area units.

Estimate download or transfer time for a file.

Encode text to Base64 or decode Base64 back to text.

Estimate a bra band and cup size from underbust and bust measurements.

Rough BTU requirement estimate for heating or cooling a room.

Quickly convert a single Celsius temperature to Fahrenheit.

Count characters in a block of text, including spaces.

Convert a US women's clothing size to the approximate EU size.

Flip one or more coins and count heads.

Check WCAG contrast ratio between two hex colors.

Calculate cubic yards of concrete needed for a slab.

Convert between bytes, KB, MB, GB, and TB.

Calculate density from mass and volume.

Calculate dew point from temperature and relative humidity.

Roll one or more dice and see the total.

Estimate the monthly cost of running an appliance.

Convert between common energy units.

Find the score needed on a final exam to hit a target grade.

Estimate trip fuel cost from distance, fuel economy, and gas price.

Calculate miles per gallon from distance and fuel used.

Calculate GDP using the expenditure approach.

Estimate a golf handicap index from a single round.

Calculate GPA from two courses' grade points and credit hours.

Calculate a weighted grade from two assignment categories.

Estimate tons of gravel needed for a project.

Calculate the 'feels like' heat index from temperature and humidity.

Estimate a child's adult height from both parents' heights (mid-parental method).

Convert a hex color code to RGB values.

Calculate horsepower from torque and RPM.

A fun novelty compatibility percentage from two names — for entertainment only.

Calculate the molarity of a solution.

Calculate molecular weight from atom counts (H, C, N, O).

Translate text into Morse code.

Calculate cubic yards of mulch needed for a garden bed.

Randomly pick one name from a list.

Calculate voltage from current and resistance.

Generate a random secure password.

Convert between common pressure units.

Generate a random whole number in a range.

Calculate resistance from two significant digits and a multiplier band.

Convert a number to Roman numerals.

Convert roof area into roofing squares.

Convert a US men's shoe size to foot length in centimeters.

Convert between common speed units.

Calculate the square footage of a rectangular space.

Calculate riser height for a staircase.

Find usable host count from a CIDR prefix.

Convert between Celsius, Fahrenheit, and Kelvin.

Calculate how many tiles you need including waste allowance.

Convert between seconds, minutes, hours, days, and weeks.

Calculate overall tire diameter from a standard tire size code.

Calculate words per minute from a word count and time.

Convert a length to every common unit at once — mm, cm, m, km, inches, feet, yards, and miles.

Encode text for safe use in a URL, or decode a URL-encoded string.

Estimate voltage drop over a wire run.

Convert between metric and US customary volume units.

Convert between metric and imperial weight units.

Calculate wind chill temperature from air temperature and wind speed.

Count words in a block of text.