Weight Converter

Weight Converter translates one mass value into equivalent values across metric, imperial/US, scientific, and astronomical units. It is useful when a label, specification, laboratory value, or scale uses a different unit from the one needed for your calculation.

The three groups cover fixed metric fields for $\mathrm{mg}$, $\mathrm{g}$, and $\mathrm{kg}$; imperial/US fields for $\mathrm{oz}$, $\mathrm{lb}$, and $\mathrm{st}$; plus selectable scientific and astronomical references such as atomic mass units, particle rest masses, Earth masses, and solar masses.

1. 1Choose the group containing the unit you know, then enter the value in its field.
2. 2Read the equivalent values in the other groups. Each field represents the same underlying mass.
3. 3For the “other” fields, select the scientific or astronomical unit that matches the result you want to report.

Internally, every field is converted through kilograms. If $M_s$ is the entered value and $f_s$ is the number of kilograms represented by one source unit, the common mass is calculated as follows: