Converters
Convert measurements, units, encoded text, and formats.
Explore 13 free converters, including Area Converter, Data Size Converter, Energy Converter, Fuel Economy Converter, and more.
Choose the right tool
Identify both the source unit and the destination unit before entering a value. Converting changes how a quantity is expressed; it does not change the quantity itself. Some conversions use a scale factor, temperature needs an offset, and fuel economy can use a reciprocal relationship. Select the conversion that matches the measurement rather than copying a factor from an unrelated unit pair.
- Length Converter: Translate linear measurements such as inches, feet, centimetres, and metres.
- Area Converter: Convert surface measurements; square units need their own conversion factors.
- Temperature Converter: Compare Celsius, Fahrenheit, and Kelvin with the correct scale and offset.
- Data Size Converter: Distinguish decimal storage units from binary units and bits from bytes.
Showing all 13 tools.
Area Converter
PopularConvert square meters, square feet, acres, hectares, and more.
Data Size Converter
Convert bits, bytes, kB, MB, GB, KiB, MiB, GiB, and more.
Energy Converter
Convert J, kJ, MJ, Wh, kWh, cal, kcal, and BTU.
Fuel Economy Converter
Convert km/L, L/100 km, US mpg, and UK mpg.
Image Resizer
Resize images by pixels and download them privately.
Length Converter
PopularConvert common length and distance units.
Power Converter
Convert W, kW, MW, hp, PS, BTU/h, and kcal/h.
Pressure Converter
Convert Pa, kPa, MPa, bar, psi, atm, mmHg, and Torr.
Roman Numeral Converter
Convert numbers to Roman numerals or Roman numerals back to numbers.
Speed Converter
Convert km/h, mph, m/s, ft/s, and knots instantly.
Temperature Converter
PopularConvert Celsius, Fahrenheit, and Kelvin temperatures.
Volume Converter
PopularConvert liters, gallons, cups, fluid ounces, and cubic units.
Weight Converter
PopularConvert kilograms, pounds, ounces, grams, stone, and tons.
Worked example: measure a rectangular panel
- A panel measuring 12 inches by 24 inches has sides of 30.48 cm and 60.96 cm because one inch is exactly 2.54 cm.
- Multiply the original sides to get 288 square inches. Convert that area to 1,858.0608 square centimetres, or multiply the two converted lengths to check the same result.
- Round only the final answer to the precision your measurement supports. A tape-measure reading does not justify every decimal produced by an exact conversion factor.
Common mistakes to avoid
- For area, square the length factor; for volume, cube it. Multiplying square inches by 2.54 alone is incorrect.
- A US gallon and an imperial gallon differ. MB and MiB also differ. Verify the full unit name when comparing labels, specifications, or prices.