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Length
Feet to Millimeters
Convert feet (ft) to millimeters (mm). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 ft = 304.8 mm
Feet to Millimeters Conversion Table
Common values, ready to copy:
| feet | millimeters |
|---|---|
| 1 ft | 304.8 mm |
| 2 ft | 609.6 mm |
| 5 ft | 1524 mm |
| 10 ft | 3048 mm |
| 25 ft | 7620 mm |
| 50 ft | 15240 mm |
| 100 ft | 30480 mm |
| 1,000 ft | 304800 mm |
Formula
millimeters = feet × 304.8
Length conversions use the SI definition: 1 inch is exactly 0.0254 meters and 1 mile is exactly 1,609.344 meters. The factor above is the exact ratio between foot and millimeter.
About Feet and Millimeters
Feet (ft): An ancient unit found in virtually every culture, historically based on the human foot; defined as exactly 0.3048 meters by the 1959 International Yard and Pound Agreement. Common uses: Human height in the United States, building heights, room dimensions, aviation altitudes (universally, even in metric countries), and yards/football fields in American sports.
Millimeters (mm): One thousandth of a meter, where the meter was originally defined in 1799 as one ten-millionth of the equator-to-pole distance, and is now defined by the speed of light. Common uses: The default precision unit in engineering drawings, machining tolerances, manufacturing specifications, and most metric-country construction blueprints.
How the conversion works
Length conversions use the SI definition: 1 inch is exactly 0.0254 meters and 1 mile is exactly 1,609.344 meters. The factor above is the exact ratio between foot and millimeter.
The exact relationship is millimeters = feet × 304.8, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between feet and millimeters comes up wherever length measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.