Converter Categories
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Length
Convert between metric and imperial length. The family converter covers meters, kilometers, feet, inches, yards, and miles. Dedicated pages such as meters to feet include the exact factor (1 m = 3.28084 ft) and a table.
7 tools
Weight
Convert mass between kilograms, grams, pounds, and ounces. The international pound is exactly 0.45359237 kg. Use kilograms to pounds for the everyday pair, or the family converter to switch any unit.
5 tools
Temperature
Convert Celsius, Fahrenheit, and Kelvin. These scales do not share a zero, so the conversion is a formula, not a single multiply. Water freezes at 0 °C / 32 °F / 273.15 K.
5 tools
Area
Convert square meters, square feet, acres, and hectares. Area units are squared lengths: 1 hectare is 10,000 m², and 1 acre is 43,560 square feet.
5 tools
Volume
Convert liters, milliliters, and US liquid gallons, quarts, pints, and cups. The US gallon used here is 3.785411784 liters, not the imperial gallon.
5 tools
Speed
Convert km/h, mph, m/s, and knots. A knot is one nautical mile (1,852 m) per hour. Useful for road limits, running pace, and marine or aviation notes.
6 tools
Data
Convert bytes through petabytes using decimal prefixes (1 kB = 1,000 bytes), which matches how storage is often advertised.
1 tools
Time
Convert seconds, minutes, hours, days, and weeks with 60 / 24 / 7 relationships. A day here is 86,400 seconds.
1 tools
Energy
Convert joules, kilocalories, watt-hours, kilowatt-hours, and BTU. A food Calorie is 1 kcal = 4,184 J.
1 tools
Pressure
Convert pascals, bars, atmospheres, psi, and mmHg. 1 atm is exactly 101,325 Pa; tire and blood-pressure figures often use psi or mmHg.
1 tools
Power
Convert watts, kilowatts, megawatts, and mechanical horsepower. 1 kW is 1,000 W.
1 tools
Angle
Convert degrees, radians, gradians, and turns. A full circle is 360°, 2π rad, 400 gon, or 1 turn.
1 tools
Frequency
Convert hertz, kHz, MHz, GHz, and RPM. 1 Hz is one cycle per second; RPM is revolutions per minute.
1 tools