# mm to Feet Converter URL: https://speedycalculator.com/calculators/conversion/mm-to-foot/ Last updated: 2026-10-25 > Convert millimetres (mm) to feet (ft): 1 millimetre = 0.0032808399 ft, so multiply by 0.0032808399 or divide by 304.8. Both fields are editable, so you can also type in feet and get millimetres back. ## Inputs - Millimetres (mm) ## Results - Feet ## Formula ``` 1 mm = 0.0032808399 ft 1 ft = 304.8 mm ft = mm × 0.0032808399 ``` ## Explanation 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 MillimetresFeetFeetMillimetres100 mm0.32808399 ft1 ft304.8 mm250 mm0.82020997 ft2 ft609.6 mm304.8 mm1 ft5 ft1,524 mm500 mm1.6404199 ft10 ft3,048 mm600 mm1.9685039 ft20 ft6,096 mm1,000 mm3.2808399 ft50 ft15,240 mm1,200 mm3.9370079 ft100 ft30,480 mm2,400 mm7.8740157 ft1,000 ft304,800 mm3,000 mm9.8425197 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). ## Worked example Inputs — Millimetres: 304.8 mm. Results — **Feet = 1 ft**. ## FAQ **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. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)