How many millimeters are in 1 foot?

One foot equals exactly 304.8 millimeters. Since 1 foot = 12 inches and 1 inch = 25.4 mm, multiply 12 by 25.4.

How do I convert feet to millimeters?

Multiply the foot value by 304.8. For example, 4 feet = 1,219.2 mm. For feet and inches, convert everything to inches first (ft x 12 + inches), then multiply by 25.4.

Because 1 inch is defined as exactly 25.4 mm (since 1959), and 1 foot = 12 inches. So 12 x 25.4 = 304.8 mm exactly. No rounding is involved.

Feet to Millimeters (ft to mm) Converter

1 ft = 304.8 mm

1 Foot equals 304.8 Millimeters (1 ft = 304.8 mm). Convert Feet to Millimeters with formula, table, and examples.

One foot equals exactly 304.8 millimeters. This conversion is essential in international engineering and manufacturing, where American designs in feet and inches must be expressed in the metric millimeters used by most of the world's factories.

How to Convert Feet to Millimeters

mm = ft × 304.8

Multiply the value in Feet by 304.8

Take your value in Feet
Multiply by 304.8
Read the result in Millimeters

Common Feet to Millimeters Conversions

Feet (ft)	Millimeters (mm)	Status
0.01 ft	3.048 mm
0.05 ft	15.24 mm
0.1 ft	30.48 mm
0.5 ft	152.4 mm
1 ft	304.8 mm
2 ft	609.6 mm
5 ft	1,524 mm
10 ft	3,048 mm
20 ft	6,096 mm
50 ft	15,240 mm
100 ft	30,480 mm
200 ft	60,960 mm
500 ft	152,400 mm
1,000 ft	304,800 mm

Good to Know About Feet to Millimeters Conversion

American construction uses feet and inches. International manufacturing uses millimeters. When an American architect sends drawings to a Chinese factory, every foot dimension becomes 304.8 mm. This conversion is performed billions of times per year in global trade.

Feet to Millimeters: What You Need to Know

A standard 2x4 lumber piece is actually 1.5 x 3.5 inches or 38.1 x 88.9 mm. An 8-foot sheet of plywood is 2,438.4 mm. Architectural drawings in the US use feet and inches, but international manufacturing needs millimeters. This conversion bridges American construction with global supply chains.

What is a Foot? ft

An imperial unit of length equal to 12 inches or 0.3048 meters. Used in the US and UK for height, altitude, and construction.

Imperial Us-customary height altitude real estate

Learn more about Foot →

What is a Millimeter? mm

A metric unit of length equal to one thousandth of a meter. Used in engineering, manufacturing, and precise measurements.

Metric engineering manufacturing rainfall

Learn more about Millimeter →

Going the other way? Use our Millimeters to Feet converter.

Feet to Millimeters FAQ

One foot equals exactly 304.8 millimeters. Since 1 foot = 12 inches and 1 inch = 25.4 mm, multiply 12 by 25.4.
Multiply the foot value by 304.8. For example, 4 feet = 1,219.2 mm. For feet and inches, convert everything to inches first (ft x 12 + inches), then multiply by 25.4.
Because 1 inch is defined as exactly 25.4 mm (since 1959), and 1 foot = 12 inches. So 12 x 25.4 = 304.8 mm exactly. No rounding is involved.

Non-Frequently Asked Questions About Feet to Millimeters

Questions nobody should ask - but someone did.

Yes, exactly. Since 1959, 1 foot = 304.8 mm by international agreement. Not 304.79 or 304.81. Exactly 304.8. This is one of the few perfectly exact conversions in the imperial-metric relationship, because the inch was defined as exactly 25.4 mm.
American carpenters think in feet and inches. European carpenters think in millimeters. A 2x4 stud (actually 1.5 x 3.5 inches) is 38 x 89 mm in metric. The wood is the same size. The tape measure is the only thing that changed.
A skilled carpenter works to about 1 mm (1/32 of a foot) tolerance. A bad carpenter might be off by 5-10 mm (1/30 to 1/60 of a foot). In a 10-foot wall, that is 50-100 mm of cumulative error. Enough to make doors not close. Precision matters at every scale.