Exact unit definition · Catalogue uniruler-preview-2026-10-19-r4
What is being measured?
Exactly 0.3048 metres per international foot.
The unit relationship is exact. A measured input can still have its own uncertainty.
Dimension
length
Reference value
1 ft
Evidence
Exact unit definition
In metres
0.3048 m
Put the length in perspective
One Foot (international) represents approximately 3.56 card lengths measured end to end. This is a length ratio; it does not calculate how the objects pack or fit.
Foot (international) · 0.3048 m
Metre · 1 m
ID-1 size card · 0.08560 m
One of each reference, on the same linear scale. Very small lengths may not be visible. This compares length, not area or physical fit.Open this worked comparison
