Unit converter
Convert 16 quantities including energy, power, pressure, length and temperature.
Unit converter
One measurement, every unit of the same quantity.
Equivalent units · Length
Select a target or copy its value.US and UK gallons differ. The calorie used equals 4.184 J. Calendar months and years vary and are excluded from time conversions.
How to convert engineering units
Convert a measurement between the available units without changing the physical quantity it represents. The converter supports 16 quantities, including energy, power, pressure, flow, torque and temperature. Available source and destination units change with the selected quantity.
Step by step
- Choose one of 16 quantities or use search.
- Enter the value and source unit. All equivalent units update together.
- Choose a target in the unit panel or copy a value. Check the quick references beside it.
Calculation method
Compatible units use scale factors relative to the quantity’s reference unit. Temperature also uses scale offsets. The full panel uses your input value; quick references use the values written in each equality.
Assumptions and limitations
Results use up to ten significant digits and scientific notation for very large or small values. Rounding is not measurement accuracy. Values below absolute zero or outside numerical range are rejected. No dimensional analysis of formulas.
Common questions
Does the converter include inches?
Yes. The pol option represents an inch, using 0.0254 metres per inch.
Why does temperature require a different formula?
Celsius, Fahrenheit and kelvin use different scales and reference points, so conversion includes the appropriate offsets.