Feet to Millimeters Calculator
Instantly convert feet (ft) to millimeters (mm) with our free online calculator
Convert Feet to Millimeters
1 foot = 304.8 millimeters
Visual Comparison
Feet
Millimeters (not to scale)
The visual representation is not to scale due to the large difference between feet and millimeters.
How to Convert Feet to Millimeters
Conversion Formula
Millimeters = Feet × 304.8
To convert a measurement from feet to millimeters, multiply the number of feet by 304.8.
Example:
Convert 5 feet to millimeters:
5 ft × 304.8 = 1,524 mm
Understanding the Units
What is a Foot?
A foot (symbol: ft) is a unit of length in the imperial and US customary systems. One foot equals exactly 12 inches or 0.3048 meters by international agreement.
What is a Millimeter?
A millimeter (symbol: mm) is a unit of length in the metric system. It equals one-thousandth (1/1,000) of a meter, which is the SI base unit of length.
Feet to Millimeters Conversion Table
| Feet (ft) | Millimeters (mm) | Feet (ft) | Millimeters (mm) |
|---|
Human Height
Average adult height:
5’10” (5.83 ft) = 1,778.0 mm
Door Height
Standard door height:
6’8″ (6.67 ft) = 2,032.0 mm
Room Size
Typical bedroom width:
10 ft = 3,048.0 mm
Frequently Asked Questions
How many millimeters are in a foot?
There are exactly 304.8 millimeters in one foot. This conversion factor is based on the international definition of 1 foot = 0.3048 meters, and 1 meter = 1000 millimeters.
Why would I need to convert feet to millimeters?
Converting between feet and millimeters is common when working across imperial and metric systems. Architects, engineers, and designers often need to make these conversions, especially when working with international specifications or materials.
Is a foot the same in all countries?
The international foot, which equals exactly 0.3048 meters (or 304.8 mm), is standardized and used in most countries. However, the US also used a slightly different “survey foot” for land surveying until 2022, when it was deprecated in favor of the international foot.
How accurate is this calculator?
This calculator provides conversions with high precision based on the exact conversion factor of 1 foot = 304.8 millimeters. The results are mathematically accurate to several decimal places, though for practical applications, rounding may be appropriate.
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