Age Calculator

Exact age, zodiac & milestones

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Time Calculator

Add & subtract time

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GPA Calculator

Semester & cumulative GPA

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Height Calculator

Predict adult height

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IP Subnet Calculator

Network subnet & IP ranges

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Password Generator

Strong & secure passwords

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Conversion Calculator

Unit conversions

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Date Calculator

Difference between dates

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Hours Calculator

Work hours & payroll

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Grade Calculator

Weighted grades & finals

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Concrete Calculator

Cement, sand & gravel

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Bra Size Calculator

Find your perfect bra size

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Dice Roller

Roll any dice combination

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Fuel Cost Calculator

Trip fuel cost estimate

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BTU Calculator

Heating & cooling BTU needs

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Time Card Calculator

Weekly timesheet & hours

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Love Calculator

Fun love compatibility

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Gas Mileage Calculator

MPG & fuel efficiency

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Engine Horsepower Calculator

Engine HP estimate

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Resistor Calculator

Resistor color code & value

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Electricity Calculator

kWh, appliances & bill

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Tip Calculator

Restaurant tip & split bill

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Density Calculator

D=M/V with unit conversions

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Weight Calculator

Weight conversions & BMI

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Molarity Calculator

C=n/V, dilutions & molar mass

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Roman Numeral Converter

Arabic ↔ Roman conversion

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Sleep Calculator

Optimal sleep cycles

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Roofing Calculator

Squares, shingles & cost

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Mulch Calculator

Cubic yards, bags & cost

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Wind Chill Calculator

Real feel temperature

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Dew Point Calculator

Humidity & dew point

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Base64 Encode / Decode

Encode & decode Base64

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Time Duration Calculator

Duration between two times

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Day of the Week Calculator

Find day for any date

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Voltage Drop Calculator

Calculate voltage drop across a wire based on length, gauge, and current

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Square Footage Calculator

Calculate square footage for rooms and flooring projects

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Time Zone Calculator

Convert time between time zones and calculate time differences

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GDP Calculator

Calculate GDP using the expenditure approach and GDP per capita

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Horsepower Calculator

Calculate horsepower from torque and RPM, or trap speed

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Stair Calculator

Calculate stair rise, run, number of steps, and stringer length

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Ohms Law Calculator

Calculate voltage, current, resistance, or power using Ohm’s Law

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Shoe Size Conversion

Convert shoe sizes between US, UK, EU, and foot length

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Mileage Calculator

Calculate fuel mileage (MPG), trip cost, and fuel needed

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Mass Calculator

Convert between units of mass - kg, lbs, grams, ounces, tons

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Speed Calculator

Calculate speed, distance, or time using the speed formula

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Molecular Weight Calculator

Calculate molecular weight of a chemical compound from its formula

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Golf Handicap Calculator

Calculate golf handicap index from recent scores

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Tire Size Calculator

Compare tire sizes and calculate diameter and speedometer difference

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Tile Calculator

Calculate how many tiles needed for a room, with waste factor

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Gravel Calculator

Calculate gravel needed for a project by volume, weight, and cost

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Heat Index Calculator

Calculate the heat index from air temperature and humidity

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Bandwidth Calculator

Calculate file transfer time based on file size and connection speed

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URL Encode / Decode

Encode or decode URLs and query string parameters

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Day Counter

Count days between two dates, or add/subtract days from a date

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