Feet to Millimeters Conversion
Enter the length in feet below to get the value converted to millimeters.
How to Convert Feet to Millimeters
To convert a foot measurement to a millimeter measurement, multiply the length by the conversion ratio. One foot is equal to 304.8 millimeters, so use this simple formula to convert:
The length in millimeters is equal to the feet multiplied by 304.8.
Our inch fraction calculator can add feet and millimeters together, and it also automatically converts the results to US customary, imperial, and SI metric values.
Feet and millimeters are both units used to measure length. Keep reading to learn more about each unit of measure.
The foot is a unit of linear length measure equal to 12 inches or 1/3 of a yard. Because the international yard is legally defined to be equal to exactly 0.9144 meters, one foot is equal to 0.3048 meters.
The foot is a US customary and imperial unit of length. Feet can be abbreviated as ft; for example, 1 foot can be written as 1 ft.
Feet can also be denoted using the ′ symbol, otherwise known as a prime, though a single-quote (') is often used instead of the prime symbol for convenience. Using the prime symbol, 1 ft can be written as 1′.
The foot is most commonly measured using either a standard 12" ruler or a tape measure, though there are many other measuring devices available. Feet are sometimes referred to as linear feet, which are simply the measurement of length in feet.
You might be interested in our feet and inches calculator, which can add feet with inches, centimeters, or meters.
The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for 10-3. Millimeters can be abbreviated as mm; for example, 1 millimeter can be written as 1 mm.
We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs.
Need a ruler? Try our free downloadable and printable rulers, which include both imperial and metric measurements.
Foot to Millimeter Conversion Table
- National Institute of Standards and Technology, U.S. Survey Foot: Revised Unit Conversion Factors, https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors
- United States Mint, Coin Specifications, https://www.usmint.gov/learn/coin-and-medal-programs/coin-specifications