Unit Converter
Free online unit converter tool. Instantly convert between units of length, weight, volume, temperature, area, speed, time, pressure, energy, power, data storage, and more.
Available Conversion Categories
Length Converter
Convert between different units of length and distance including meters, feet, inches, kilometers, miles, and more.
Units: Meter, Kilometer, Centimeter, Millimeter, Mile, Yard, Foot, Inch, Nautical Mile
Weight Converter
Convert between weight and mass units including kilograms, pounds, ounces, grams, and tons.
Units: Kilogram, Gram, Milligram, Pound, Ounce, Stone, Tonne
Volume Converter
Convert between volume units including liters, gallons, cups, milliliters, and cubic meters.
Units: Liter, Milliliter, Gallon (US), Gallon (UK), Quart, Pint, Cup, Fluid Ounce
Temperature Converter
Convert between temperature scales including Celsius, Fahrenheit, and Kelvin.
Units: Celsius, Fahrenheit, Kelvin
Area Converter
Convert between area units including square meters, acres, hectares, square feet, and square miles.
Units: Square Meter, Square Kilometer, Hectare, Acre, Square Mile, Square Foot, Square Inch
Speed Converter
Convert between speed units including km/h, mph, meters per second, knots, and mach.
Units: Meter/Second, Kilometer/Hour, Mile/Hour, Knot, Mach
Time Converter
Convert between time units including seconds, minutes, hours, days, weeks, months, and years.
Units: Second, Minute, Hour, Day, Week, Month, Year
Pressure Converter
Convert between pressure units including Pascal, Bar, PSI, and atmospheres.
Units: Pascal, Kilopascal, Bar, PSI, Atmosphere
Energy Converter
Convert between energy units including Joules, calories, kilowatt-hours, and BTU.
Units: Joule, Kilojoule, Calorie, Kilocalorie, Watt Hour, Kilowatt Hour, BTU
Power Converter
Convert between power units including Watts, Kilowatts, Horsepower, and BTU/hour.
Units: Watt, Kilowatt, Megawatt, Horsepower
Data Storage Converter
Convert between digital storage units including bytes, kilobytes, megabytes, gigabytes, and terabytes.
Units: Bit, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte
Angle Converter
Convert between angle units including degrees, radians, and gradians.
Units: Degree, Radian, Gradian
Fuel Economy Converter
Convert between fuel economy units including km/L, L/100km, MPG (US), and MPG (UK).
Units: Kilometer/Liter, Liter/100km, MPG (US), MPG (UK)
Frequency Converter
Convert between frequency units including Hertz, Kilohertz, Megahertz, and Gigahertz.
Units: Hertz, Kilohertz, Megahertz, Gigahertz
Frequently Asked Questions
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. This is the international standard conversion, defined since 1959. To convert inches to centimeters, multiply the number of inches by 2.54.
How many pounds are in a kilogram?
There are approximately 2.20462 pounds in one kilogram. To convert kilograms to pounds, multiply the weight in kilograms by 2.20462. For a quick estimate, multiply by 2.2.
How do I convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, use the formula: °F = (°C × 9/5) + 32. For example, 20°C equals 68°F. For a quick estimate, double the Celsius and add 30.
How many feet are in a meter?
There are approximately 3.28084 feet in one meter. To convert meters to feet, multiply by 3.28084. For the reverse, one foot equals 0.3048 meters.
How many kilometers are in a mile?
There are approximately 1.60934 kilometers in one mile. To convert miles to kilometers, multiply by 1.60934. To convert kilometers to miles, multiply by 0.62137.
How many liters are in a gallon?
A US gallon contains approximately 3.78541 liters. A UK (imperial) gallon contains about 4.54609 liters. Always check which gallon type is being used.
How many ounces are in a gram?
One gram equals approximately 0.03527 ounces. Conversely, one ounce equals about 28.3495 grams. For cooking, 30 grams per ounce is a common approximation.
How many bytes are in a gigabyte?
In decimal (SI) units, 1 gigabyte = 1,000,000,000 bytes (10⁹). In binary units, 1 gibibyte (GiB) = 1,073,741,824 bytes (2³⁰). Storage manufacturers use decimal, while operating systems often use binary.
Disclaimer: The information and conversion results provided by this tool are for general informational purposes only. While we strive for accuracy, we make no warranties regarding completeness, reliability, or suitability for any purpose. Conversions may be approximate due to rounding and differences in standards. Do not rely on this tool for safety-critical, medical, legal, engineering, or financial decisions—please consult qualified professionals or official references.