Convert values between common measurement units for length, weight, mass, volume, area, temperature, speed, time, energy, and pressure using accurate conversion factors.
1 meter equals approximately 3.28084 feet.
Converted value = Source value × Conversion factor
For affine conversions such as temperature, an offset is also applied.The tool applies the relevant factor or temperature offset to the source value. Currency outputs require a current exchange-rate source, while cooking volume-to-weight conversions can vary by ingredient density and measuring method.
Conversion of units. Utilize the Unit Converter to change units from comparable units of measurement. Choose the category of measurement, input the value, choose the unit of measurement to convert from and to and then obtain the converted value. Conversion factors vary for different units of measurement so the proper conversion equation and factor must be used according to the category of measurement selected.
For conversions that use a constant multiplicative factor, the general formula is:
Converted value = Original value × Conversion factor
Some reverse conversions instead use division by the same factor. Temperature conversions are different because they may require both multiplication and addition or subtraction.
For example, 1 inch is exactly equal to 2.54 centimeters.
Starting value: 10 inches
Calculation: 10 × 2.54 = 25.4
Result: 10 inches = 25.4 centimeters
| Conversion | Equivalent |
|---|---|
| 1 inch to centimeters | 2.54 cm |
| 1 foot to inches | 12 in |
| 1 foot to meters | 0.3048 m |
| 1 yard to feet | 3 ft |
| 1 yard to meters | 0.9144 m |
| 1 mile to kilometers | 1.609344 km |
| 1 kilometer to miles | 0.621371 mi |
| 1 meter to centimeters | 100 cm |
| 1 centimeter to millimeters | 10 mm |
| 1 kilogram to grams | 1,000 g |
| 1 kilogram to pounds | 2.204623 lb |
| 1 pound to ounces | 16 oz |
| 1 pound to kilograms | 0.453592 kg |
| 1 ounce to grams | 28.349523 g |
| 1 liter to milliliters | 1,000 mL |
| 1 US gallon to US quarts | 4 qt |
| 1 US quart to US pints | 2 pt |
| 1 US cup to US fluid ounces | 8 fl oz |
| 1 hour to minutes | 60 min |
| 1 minute to seconds | 60 sec |
United States users commonly convert between US customary units and metric units. Examples include inches to centimeters, feet to meters, miles to kilometers, pounds to kilograms, ounces to grams, gallons to liters, and Fahrenheit to Celsius.
Metric conversions within the same measurement family are often based on powers of 10. For example, 1 meter equals 100 centimeters, 1 kilogram equals 1,000 grams, and 1 liter equals 1,000 milliliters.
Some unit relationships are exactly defined. For example, 1 inch is exactly 2.54 centimeters, and 1 pound is exactly 0.45359237 kilograms. A calculator may display fewer decimal places to make the result easier to read.
For measurements requiring high precision, keep more decimal places during calculations and round only the final result. For everyday conversions, a shorter rounded value is usually sufficient.
Not every pair of units can be converted directly. Units must normally describe the same type of physical quantity.
For example, liters measure volume while kilograms measure mass. Converting liters to kilograms requires the density of the material. One liter of water and one liter of another substance may have different masses.
Similarly, mass units such as kilograms should not be treated as force units such as newtons. Energy units and power units also represent different quantities and cannot be directly converted without additional information such as time.
A unit converter calculates an equivalent measurement in another compatible unit. It can be used for measurements such as length, mass, volume, area, temperature, speed, time, energy, and pressure.
Enter the original measurement and apply the correct conversion factor or conversion formula for the two units. A unit converter performs this calculation automatically.
Some conversion factors are exact by definition, while displayed results may be rounded. The required precision depends on the units and the purpose of the calculation.
Units from different measurement systems often do not have simple whole-number relationships. Decimal values are therefore necessary to represent the converted measurement accurately.
Yes. Common examples include kilometers to miles, meters to feet, centimeters to inches, kilograms to pounds, liters to gallons, and Celsius to Fahrenheit.
Not universally. A volume-to-mass conversion requires the density of the material. Without density, there is no single conversion factor that works for every substance.
Enter a known source value, confirm the direction of conversion and compare the result with the level of precision required. Keep extra decimal places for technical work and round only at the final step.
A Unit Converter makes it easier to switch between compatible measurement units without manually calculating each conversion factor. It is useful for everyday measurements, education, engineering, travel, cooking, fitness, construction, science, and international comparisons.
Many users need to convert between metric units and US customary units. Common examples include centimeters to inches, meters to feet, kilometers to miles, kilograms to pounds, liters to gallons, and Celsius to Fahrenheit.
Some unit relationships are exact, while others may be displayed as rounded decimal values. For calculations that require higher precision, keep additional decimal places until the final step and round only the final converted value.
Units must generally measure the same physical quantity to be converted directly. For example, liters measure volume while kilograms measure mass. Converting between volume and mass requires additional information such as the density of the substance.