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. The same amount is also shown in in, m, cm.
- To go from feet back to millimetres, type into the Feet field instead. Every field also has a unit menu with all 27 length units, for example m, km, cm, dm, µm, nm, Å, in, yd, mi, nmi, mil, furlong.
Results update as you type, and everything is calculated in your browser.
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, for example 609.6 mm is 2 ft.
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 |
Length units explained
- Millimetre (mm)
- A millimetre is one thousandth of a metre. Engineering drawings, construction plans, rainfall, screws, bolts and jewellery are all dimensioned in millimetres.
- Foot (ft)
- 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.
Formula
1 mm = 0.0032808399 ft
1 ft = 304.8 mm
ft = mm × 0.0032808399
Worked example
Inputs: Millimetres: 304.8 mm.
Results: Feet = 1 ft; Inches = 12 in; Metres = 0.3048 m; Centimetres = 30.48 cm.
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 the millimetres to feet conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 ft = 304.8 mm exactly, so the only difference you may see is rounding in the last displayed digit.