Feet to Millimeters Converter

Convert feet to millimeters instantly.

Common length units

Foot (ft)

Definition: A foot (symbol: ft or ') is a unit of length equal to exactly 0.3048 meters, or 12 inches. It is part of the imperial and US customary systems of measurement.

History/origin: As the name suggests, the foot was historically based on the length of a human foot. Various cultures used their own versions of the foot as a practical unit of measure. The international foot was standardized at exactly 0.3048 m in 1959.

Current use: The foot is primarily used in the United States for altitude in aviation, human height, and real estate. It also remains in common use in the United Kingdom alongside metric units.

Millimeter (mm)

Definition: The millimeter is a small metric length unit. Each mm is 0.001 meters, and 10 millimeters make one centimeter.

History/origin: Metric measurement made it easy to divide the meter into thousandths, giving builders, makers, and engineers a precise unit that avoids awkward fractions.

Current use: Mm is used for screws, product specs, machining, 3D printing, phone dimensions, rainfall, medical scans, jewelry sizes, and layout work where centimeters are too coarse.