Numbers and money
Converters & Units
32 free tools for switching between units: length, weight, volume, temperature, speed, pressure and energy, kW and HP, fuel economy, clothing, shoe, ring and bra sizes, TV inches, bytes, paper sizes, Roman numerals and numbers in words, plus a number base converter.
Most popular
Fuel economy converter
Convert MPG (US/UK), L/100 km and km/L, and compute real-world gas mileage.
Time unit converter
Seconds, minutes, hours, days, weeks, months, and years, instant conversion.
kW to HP converter
Convert kilowatts, horsepower and metric horsepower (PS) instantly.
Temperature converter
Fahrenheit, Celsius and Kelvin in one click, with formulas and references.
Clothing size converter
US, UK, EU, IT and XS–XXL sizes for men and women, with clear charts.
TV size calculator
Width, height and area from a TV's diagonal inches, plus viewing distance.
All tools, A to Z 32
Angle converter
Degrees, radians, and gradians in real time, with exact values in pi.
Area converter
Convert acres, square feet, hectares and m² with football-field comparisons.
Battery capacity
mAh ⇄ Wh, power bank charges, airplane rule
Bra size
Find your size from two tape measurements
Clothing size converter
US, UK, EU, IT and XS–XXL sizes for men and women, with clear charts.
Data storage converter
Convert bits, bytes, KB, MB, GB and TB in decimal and binary units.
Density converter
kg/m³, g/cm³, g/L, kg/L, lb/ft³.
Download time
How long it takes to download a file
Energy converter
Convert joules, calories, kcal, watt-hours, kWh and BTU in real time.
Flow rate converter
L/s, L/min, m³/h and other flow units.
Force converter
newton, kgf, pound-force and other force units.
Frequency converter
hertz, kilohertz, megahertz, gigahertz, rpm.
Fuel economy converter
Convert MPG (US/UK), L/100 km and km/L, and compute real-world gas mileage.
Illuminance converter
lux, foot-candle, phot and other light units.
kW to HP converter
Convert kilowatts, horsepower and metric horsepower (PS) instantly.
Length converter
Inches, feet, yards, miles, meters, cm and km converted in real time.
Model scale converter
Convert real sizes to scale (1:87, 1:43…)
Number Base Converter
Convert numbers between binary, octal, decimal, hex and any base 2-36 live.
Number to words
Spell out any amount in words for writing checks, up to 999 billion.
Paper sizes A0–A7
Sheet dimensions in mm, cm, inches and pixels
Power converter
watt, kilowatt, metric hp, HP, BTU/h and kcal/h.
Pressure converter
Convert PSI, bar, atm, pascals, kPa and mmHg, with tire pressure references.
Ring size
Find the size from diameter or circumference
Roman numerals
Convert Roman and Arabic numbers up to 3999, with error checking.
Shoe size converter
US, UK, EU sizes from foot length in inches or cm: men, women and kids.
Speed converter
Convert mph, km/h, knots and m/s in real time, with Mach number.
Temperature converter
Fahrenheit, Celsius and Kelvin in one click, with formulas and references.
Time unit converter
Seconds, minutes, hours, days, weeks, months, and years, instant conversion.
Torque converter
newton meter, kgf·m, pound-foot and more.
TV size calculator
Width, height and area from a TV's diagonal inches, plus viewing distance.
Volume converter
Convert gallons, liters, cups, pints, ml and cubic meters in real time.
Weight converter
Convert pounds, ounces, stone, kilograms and grams in real time.