The millimeter (metric) and the foot (US/UK customary) both have exact definitions, making this a precise length conversion.
How it works
Dividing millimeters by 304.8 gives feet; multiplying feet by that same constant gives millimeters back. Type into either field and the other updates instantly.
What this does not include
This does not include inches — for that, use this site’s mm-to-inches calculator instead.
How to use this calculator
- Enter a value in either millimeters or feet — the other field fills in automatically.
Frequently asked questions
Why is 1 foot exactly 304.8 mm?
It’s the exact international definition set by a 1959 agreement standardizing the foot at 0.3048 meters.
Where is this conversion most commonly needed?
Engineering and construction specs that mix metric and imperial measurements.
Is this different from converting millimeters to inches?
Only in scale — a foot is 12 inches, so this handles the larger unit directly without an intermediate inches step.
