Temperature
Switch from degrees Celsius to degrees Fahrenheit or kelvins.
20 °C corresponds to 68 °F and 293.15 K.
Tips and precautions
The scales do not have the same origin. To convert from Celsius to Fahrenheit, multiply by 9/5 then add 32. To get kelvins, add 273.15 to the degrees Celsius.
Do not confuse a temperature with a temperature difference. A difference of 1 °C is equal to 1 K, whereas a temperature of 1 °C is 274.15 K.
Length
Compare millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
1 mile is equivalent to 1.609344 km; 1 inch is equivalent to 2.54 cm.
Tips and precautions
The calculation first converts the value to meters, then divides it by the factor of the output unit. Conversions in this family involve a single dimension.
For a plan, also check the scale of the drawing. A length does not convert using the same factor as an area.
Mass
Converting from milligrams to grams, kilograms, tons, ounces, or pounds.
1 pound corresponds to 0.45359237 kg.
Tips and precautions
The factors on this page use the avoirdupois pound and ounce. The value is reduced to grams to convert from one unit to another.
The ounce of mass should not be confused with a fluid ounce. The troy units used in some fields are not those of this calculator.
Area
Compare areas in cm², m², km², hectares, square feet, or acres.
1 hectare corresponds to 10,000 m².
Tips and precautions
An area concerns two dimensions. One meter is one hundred centimeters, but one square meter is ten thousand square centimeters.
Check the squared symbol and the unit of the plan. A mistake between m and m² completely changes the meaning of the result.
Volume
Compare milliliters, centiliters, liters, cubic meters, gallons, and pints.
1 m³ corresponds to 1,000 L. A US gallon is worth 3.785411784 L.
Tips and precautions
This calculator uses the US gallons and pints from the existing component. A US pint is worth 0.473176473 liters.
The British imperial units have different values. Check the origin of the measurement before using a gallon or a pint.