Fathom to Zeptometer

How it is calculated

Each unit is defined via the base unit (meter (m)). The value is first converted to the base unit, then to the selected unit.

1 ftm = 1.8288 m

1 zm = 1.00000000e-21 m

1 ftm × 1.8288 = 1.8288 m

1.8288 m ÷ 1.00000000e-21 = 1.82880000e21 zm