Feet to Millimeters converter (ft to mm)
Convert Feet (ft) to Millimeters (mm) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
How to convert Feet to Millimeters
1 foot (ft) is equal to 304.8 millimeters (mm).
1 ft = 304.8 mm
The length L in millimeters (mm) is equal to the length L in feet (ft) multiplied by 304.8:
Example: Convert 5 ft to mm:
L(mm) = 5 × 304.8 = 1524 mm
What is a Feet?
The foot (ft) is 12 inches, or 0.3048 metres exactly. US construction and human height are still quoted in feet.
What is a Millimeters?
The millimetre (mm) is 1÷1,000 of a metre. Machining, rainfall, and small product dimensions are specified in millimetres.
This page converts length from Feet into Millimeters. One ft equals 304.8 mm.
Feet to Millimeters conversion table
Common ft values and the matching mm result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Feet (ft) | Millimeters (mm) |
|---|---|
| 0 ft | 0 mm |
| 1 ft | 304.8 mm |
| 2 ft | 609.6 mm |
| 3 ft | 914.4 mm |
| 4 ft | 1219.2 mm |
| 5 ft | 1524 mm |
| 6 ft | 1828.8 mm |
| 7 ft | 2133.6 mm |
| 8 ft | 2438.4 mm |
| 9 ft | 2743.2 mm |
| 10 ft | 3048 mm |
| 15 ft | 4572 mm |
| 20 ft | 6096 mm |
| 30 ft | 9144 mm |
| 40 ft | 12192 mm |
| 50 ft | 15240 mm |
| 100 ft | 30480 mm |
How this calculator works
The form on this page is a Feet-to-Millimeters converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the mm result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many mm are in 1 ft?
1 ft = 304.8 mm.
How do I convert Feet to Millimeters?
The length L in millimeters (mm) is equal to the length L in feet (ft) multiplied by 304.8:
Is this ft to mm converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.