Converting units

Length, mass, time and temperature are different quantities. Conversion is meaningful only within a matching dimension: metres cannot be converted to kilograms.

Metric prefixes such as milli-, kilo- and mega- represent fixed powers of ten and simplify many linear conversions.

For linear units, a fixed factor is usually enough. A distance stays the same whether it is displayed in metres or kilometres.

Temperature shows why an offset may matter: Celsius and Fahrenheit have different zero points and step sizes. Some consumption measures also use an inverse relationship.

Each category therefore needs its own conversion rule rather than a universal factor.

A conversion can be exact while the input is already measured or rounded. A long decimal is not automatically a more accurate real measurement.

Round for display, but avoid unnecessary early rounding in intermediate steps.

Conversion does not check whether the underlying concept is appropriate: volume, mass and nutritional value are different things. Correct category selection matters for technical quantities.

A consumption per distance cannot be treated like an ordinary linear unit when its reference is zero.

Our tool assigns units to categories and converts through defined reference values. It supports everyday, physical and technical quantities, and available units can be searched within a chosen category.

Linear categories use factors. Temperature and other special cases use their appropriate rule so a factor-only assumption does not produce a wrong result.