Feet are convenient for people, but machines and drawings want millimeters. One foot equals exactly 304.8 millimeters, so even a modest room dimension turns into a four-digit number fast. Carpenters, cabinet makers, and engineers reach for the feet-to-millimeter conversion when plans switch from rough framing to fine tolerances. Whether you are cutting a shelf, checking a shipping box, or filling in a technical form, the calculator below turns any feet value into exact millimeters instantly — no mental arithmetic with decimal points.
Feet to Mm Converter
Result will appear here
Feet to Mm Conversion Formula
A foot is 12 inches, and the inch is defined as exactly 25.4 mm, so one foot is 12 × 25.4 = exactly 304.8 millimeters. Multiply any feet value by 304.8 and you get millimeters. Because both steps of the chain are exact definitions, the feet-to-millimeter conversion is exact too.
mm = ft × 304.8
Example: 6 ft × 304.8 = 1,828.8 mm — a 6-foot board measures 1,828.8 millimeters.
To convert back: ft = mm ÷ 304.8.
How to Convert Feet to Mm
- Type the feet value into the converter above.
- The millimeter result updates live as you type.
- Use Swap to convert millimeters back to feet.
- Manual method: multiply feet by 304.8.
Feet to Mm Conversion Chart
Look up any whole-foot value on the left and read its exact millimeter equivalent on the right. From a 1-foot ruler (304.8 mm) to a 100-foot run (30,480 mm), the table covers workshop staples like 6-foot boards (1,828.8 mm) and 10-foot rooms (3,048 mm).
| Feet (ft) | Millimeters (mm) |
| 1 | 304.8 |
| 2 | 609.6 |
| 3 | 914.4 |
| 4 | 1219.2 |
| 5 | 1524 |
| 6 | 1828.8 |
| 7 | 2133.6 |
| 8 | 2438.4 |
| 9 | 2743.2 |
| 10 | 3048 |
| 25 | 7620 |
| 50 | 15240 |
| 100 | 30480 |
FAQs
What is the formula to convert feet to mm?
Multiply feet by 304.8: mm = ft × 304.8. So 2 ft is 609.6 mm and 10 ft is 3,048 mm. The result is always exact — 304.8 comes from 12 inches × 25.4 mm, both international definitions.
How many millimeters are in 1 foot?
Exactly 304.8 millimeters. Twelve inches of 25.4 mm each gives 304.8 mm with no rounding involved, so you can trust the figure on technical drawings and spec sheets alike.
How many feet are in 1 millimeter?
One millimeter equals 0.00328084 feet — divide millimeters by 304.8 to convert. It is a tiny fraction, which is why this direction is usually done with a calculator rather than by hand.
Which is bigger, a foot or a millimeter?
A foot is much bigger: one foot equals 304.8 millimeters. Feet suit human-scale measurements like room sizes and heights, while millimeters suit machine-scale work like machining tolerances and component dimensions.
Where is the feet-to-mm conversion used in real life?
In construction drawings that mix imperial room dimensions with metric material specs, furniture assembly instructions, shipping and freight forms that ask for millimeter dimensions, and workshop projects — cutting a 6-foot shelf means cutting 1,828.8 mm of timber.