How to convert feet to millimeters
To convert a measurement in feet to millimeters, multiply the value by 304.8. The conversion factor comes from the relationship between both units and the meter (the SI base unit of length).
For example, to convert 5 ft to millimeters: 5 × 304.8 = 1,524 mm.
What is a foot?
A foot is an imperial unit of length equal to 12 inches or exactly 0.3048 meters. One of the oldest units of measurement, based on the human foot. Used in ancient civilizations from Egypt to Rome. The international foot was defined as exactly 0.3048 meters in 1959.
Common uses of feet include: Human height in the US and UK (e.g. 5'10"); Room dimensions and ceiling height; Aviation altitude measurement worldwide; Construction and building codes in imperial countries.
What is a millimeter?
A millimeter is a metric unit of length equal to one thousandth of a meter (0.001 m) or approximately 0.039 inches. Part of the original metric system, the millimeter derives from the Latin 'mille' (thousand). It became essential during the Industrial Revolution for precision engineering.
Common uses of millimeters include: Engineering tolerances and mechanical parts; Rainfall measurement in meteorology; Paper thickness and printing specifications; Dental and medical precision measurements.
When you need to convert feet to millimeters
Converting feet to millimeters is useful in scientific calculations, international trade, and any context where measurements need to be expressed in the other system for clarity or compliance.
Feet to millimeters worked examples
Here are some common values converted:
1 ft = 304.8 mm 5 ft = 1,524 mm 10 ft = 3,048 mm 50 ft = 15,240 mm 100 ft = 30,480 mm
Frequently asked questions
How many millimeters are in one foot?
One foot (ft) equals 304.8 millimeters (mm). Multiply any value in feet by 304.8 to convert to millimeters.
How do I convert feet to millimeters?
Multiply the value in feet by 304.8. For example, 5 ft × 304.8 = 1,524 mm.
How do I convert millimeters to feet?
Multiply the value in millimeters by 0.0032808399, or divide by 304.8. Use the swap button on the converter above to reverse the direction.
Is the foot to millimeter conversion exact?
Yes, the conversion is exact. Since 1959, one inch is defined as exactly 25.4 mm (the international yard and pound agreement), so all metric-imperial length conversions use exact factors.
What is the formula for feet to millimeters?
The formula is: mm = ft × 304.8. This is derived from the definition of both units relative to the meter (the SI base unit of length).