How it works
Every unit is defined as a number of meters, so converting between any two units is a matter of converting the source to meters and then to the target unit. The bridge between metric and imperial is the internationally agreed exact definition of an inch: precisely 2.54 centimeters.
Why not round conversion factors
Older conversion charts sometimes round the metric-imperial relationship for convenience, which compounds into visible error for large values. This tool always uses the exact defined ratios, so results stay accurate at any scale.
Common uses
Converting a recipe, a home improvement measurement, or a running distance between the unit system you think in and the one a source material uses.