When to use this calculator
Use this when you already know the conversion factor, such as converting inches to centimetres with a factor of 2.54. Use offset 0 for most linear unit conversions.
Example
To convert 10 inches to centimetres, enter value 10, factor 2.54 and offset 0. The result is 25.4 centimetres.
When to use offset
Temperature-style conversions can need both a factor and offset, but the main unit converter is better for common units because it already includes the standard temperature formulas.
Common mistakes
Check whether the conversion is value x factor or value divided by factor. If you are converting back the other way, you may need the reciprocal factor.
Last reviewed: 2026-05-17