Millimeters to Feet
Type a value in either box to convert between millimeters and feet. The factor is 0.00328084.
| Millimeters | Feet |
|---|---|
| 1 mm | 0.003281 ft |
| 2 mm | 0.006562 ft |
| 3 mm | 0.009843 ft |
| 5 mm | 0.016404 ft |
| 10 mm | 0.032808 ft |
| 25 mm | 0.082021 ft |
| 50 mm | 0.164042 ft |
| 100 mm | 0.328084 ft |
How to use
- Enter a value in the Millimeters field.
- The Feet figure appears immediately — no button to press.
- Typing in the Feet field converts back to Millimeters the same way.
- Use the reference table for the values that come up most often.
Millimeters to Feet formula
To convert millimeters to feet, multiply by 0.0032808399.
ft = mm × 0.0032808399
Why this factor: the millimeter and the foot are both defined against the meter, so dividing one definition by the other gives 0.0032808399 directly. Both definitions are set out in full below.
To go the other way, divide by 0.0032808399 — or use the Feet to Millimeters converter, which is the same calculation reversed.
Worked example
Take 100 mm and multiply by the factor 0.0032808399: the result is 0.328084 ft.
100 mm × 0.0032808399 = 0.328084 ft
The converter above does this for any value you type, in either direction.
What is a millimeter?
A millimeter is one thousandth of a meter — the working precision unit of manufacturing and construction.
Definition: Exactly 0.001 meter by SI prefix definition.
Where it is used: Engineering drawings, machining tolerances, timber and steel dimensions, rainfall totals.
What is a foot?
A foot is twelve inches, the primary unit for human-scale dimensions in the US.
Definition: Exactly 0.3048 meter since 1959 — one third of the international yard.
Where it is used: Building heights, room dimensions, aviation altitude worldwide, and personal height in the US and UK.
Worth knowing: The US survey foot, very slightly longer, was used in land surveying until it was officially retired at the end of 2022.
Millimeters vs Feet
The millimeter is a metric unit while the foot is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many feet are in a millimeter?
One millimeter equals 0.0032808399 feet.
What is the formula to convert millimeters to feet?
Multiply the number of millimeters by 0.0032808399. To reverse it, divide by 0.0032808399 instead.
How do I convert feet back to millimeters?
Divide by 0.0032808399, which is the same as multiplying by 304.8.
How many feet are in 10 millimeters?
10 mm works out to 0.032808 ft.
Is there anything to watch out for with feet?
The US survey foot, very slightly longer, was used in land surveying until it was officially retired at the end of 2022.
How is the millimeter defined?
Exactly 0.001 meter by SI prefix definition.