# Feet to Millimeters (ft to mm)

Source: https://www.unitconvertercalculator.com/length/feet-to-millimeters/

**1 ft = 304.8 mm**

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.

## Formula

Convert Feet to Millimeters

## Conversion Table

| Feet (ft) | Millimeters (mm) |
|---|---|
| 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 | 1524 mm |
| 10 ft | 3048 mm |
| 20 ft | 6096 mm |
| 50 ft | 15240 mm |
| 100 ft | 30480 mm |
| 200 ft | 60960 mm |
| 500 ft | 152400 mm |
| 1000 ft | 304800 mm |

## Units

### 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.

### Millimeter (mm)

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

## Background

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.

## Good to Know

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.

## FAQ

### 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.

### Why is 304.8 exact?

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

### Is a foot exactly 304.8 millimeters?

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.

### Do carpenters think in feet or millimeters?

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.

### How many millimeters of error does a bad carpenter make?

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.

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## See Also

- [Millimeters to Feet](https://www.unitconvertercalculator.com/length/millimeters-to-feet/)