About the mm to ft calculation
One millimeter is exactly 0.00328084 feet, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The standard fine unit on engineering drawings and rainfall figures. Used for human height in the US and UK, and for altitude in aviation globally.
Formula
ft = mm × 0.00328084
1 mm = 0.00328084 ft
1 ft = 304.8 mmWorked example
To convert 100 mm, multiply by 0.00328084: 100 × 0.00328084 = 0.328084 ft.
Frequently asked questions
How many feet are in a millimeter?
There are 0.00328084 feet in one millimeter. To convert any amount, multiply the number of millimeters by 0.00328084.
How do I convert feet back to millimeters?
Divide instead of multiplying, or equivalently multiply by 304.8. One foot is 304.8 millimeters.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between millimeters and feet is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Millimeters: the standard fine unit on engineering drawings and rainfall figures. Feet: used for human height in the US and UK, and for altitude in aviation globally.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units