A foot is exactly 304.8 mm. Architects and builders working between metric and imperial drawings use this to translate dimensions.
How to use the mm to Feet Converter
- Type the number of millimetres into the Millimetres field. Decimals such as 152.4 are fine.
- Read the answer in Feet – it updates as you type, with no button to press.
- To convert the other way, type into Feet and the millimetres are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only mm ⇄ ft. Need a different unit? Use the general length converter, where you can choose any “from” and “to” unit.
How it works
Both units measure length, so they are always in the same ratio: one millimetre equals 0.0032808399 feet. The calculator multiplies the number of millimetres you type by 0.0032808399 to give feet, and when you type into the feet field it divides by the same factor to give millimetres. Because the ratio never changes, doubling the millimetres always doubles the feet. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert millimetres to feet
- Write down the value in millimetres, for example 304.8 mm.
- Multiply by the conversion factor 0.0032808399 (because 1 millimetre = 0.0032808399 ft).
- 304.8 × 0.0032808399 = 1 ft.
- To go back from feet to millimetres, divide by 0.0032808399 – or multiply by 304.8.
mm to ft conversion table
| Millimetres | Feet | Feet | Millimetres |
|---|---|---|---|
| 100 mm | 0.32808399 ft | 1 ft | 304.8 mm |
| 250 mm | 0.82020997 ft | 2 ft | 609.6 mm |
| 304.8 mm | 1 ft | 5 ft | 1,524 mm |
| 500 mm | 1.6404199 ft | 10 ft | 3,048 mm |
| 600 mm | 1.9685039 ft | 20 ft | 6,096 mm |
| 1,000 mm | 3.2808399 ft | 50 ft | 15,240 mm |
| 1,200 mm | 3.9370079 ft | 100 ft | 30,480 mm |
| 2,400 mm | 7.8740157 ft | 1,000 ft | 304,800 mm |
| 3,000 mm | 9.8425197 ft |
What is a millimetre?
A millimetre is one thousandth of a metre. Engineering drawings, construction plans, rainfall, screws, bolts and jewellery are all dimensioned in millimetres.
What is a foot?
The international foot is exactly 0.3048 m and contains 12 inches. It remains the everyday unit for height, room dimensions and altitude in the U.S., and for aviation altitude worldwide.
Quick mental conversion
For a fast estimate, multiply millimetres by about 0.0033 to get feet; the error is about 0.6%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Mixing the international foot (0.3048 m) with the old u.s. survey foot, confusing nautical and statute miles, and writing decimal feet such as 5.5 ft as “5 ft 5 in” (it is 5 ft 6 in).
Formula
1 mm = 0.0032808399 ft1 ft = 304.8 mmft = mm × 0.0032808399Worked example
Inputs — Millimetres: 304.8 mm.
Results — Feet = 1 ft.
Frequently asked questions
How many mm in a foot?
304.8 mm.
How many feet is 1,000 mm?
About 3.28 ft.
How do I convert millimetres to feet?
Multiply the number of millimetres by 0.0032808399. For example, 304.8 mm × 0.0032808399 = 1 ft.
How do I convert feet back to millimetres?
Divide by 0.0032808399 (or multiply by 304.8), or simply type the value into the feet field above.
What is 100 mm in feet?
100 mm = 0.32808399 ft.
What is 1,000 mm in feet?
1,000 mm = 3.2808399 ft.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between millimetres and feet. To pick any length unit, use the general length converter linked under Related calculators.
What formula does the mm to Feet Converter use?
1 mm = 0.0032808399 ft.