Convert Millimeters to Feet
Millimeters to feet crosses from the fine-grained metric system into the imperial system, so it comes up mostly in engineering and construction. One millimeter is approximately 0.003281 feet.
Millimeters to Feet conversion table
| Millimeters (mm) | Feet (ft) |
|---|---|
| 1 | 0.003281 |
| 2 | 0.006562 |
| 3 | 0.009843 |
| 5 | 0.016404 |
| 10 | 0.032808 |
| 20 | 0.065617 |
| 50 | 0.164042 |
| 100 | 0.328084 |
| 500 | 1.64042 |
| 1,000 | 3.28084 |
The formula
To convert millimeters to feet, multiply the length in millimeters by 0.003281:
feet = millimeters × 0.003281
A worked example
Converting 100 mm into feet:
100 × 0.003281 = 0.328084 ft
Smaller values scale the same way: 10 mm is 0.032808 ft, and 5 mm is 0.016404 ft.
When you'll use it
Checking a machined part's dimension against a US drawing, comparing a millimeter-based spec sheet to a construction plan measured in feet, or converting sensor data. Because the result is approximate, round it to the precision your project actually needs.
Frequently asked questions
How many feet are in a millimeter?
About 0.003281 feet. It's a rounded figure — the true value doesn't terminate cleanly, so this is the practical number to use.
Is the millimeter to feet conversion exact?
No, it's approximate. Millimeters and feet come from different measurement systems, and the ratio between them has to be rounded for everyday use.
Why is the millimeter to feet number so small?
Because a foot is roughly 305 millimeters long. A single millimeter is a tiny sliver of a foot, so the converted value stays close to zero for small lengths.