Convert Feet to Millimeters Instantly
Use this Feet to Millimeters converter to change feet (ft) into millimeters (mm) for construction drawings, fabrication, engineering, woodworking, product dimensions and everyday measurements. The relationship is exact: 1 foot = 304.8 millimeters. The page also includes reverse millimeters-to-feet conversion, feet-and-inches input and a multi-unit length converter.
Convert feet to millimeters, reverse millimeters to feet, combine feet and inches into millimeters, or convert one length across common metric and imperial units.
Enter a foot value to calculate exact millimeters plus inches, centimeters and meters.
Decimals are supported, such as 5.5 ft or 12.25 ft.
Reverse the conversion and see decimal feet, feet-and-inches, inches and meters.
Enter separate feet and inches values and convert the combined length into millimeters.
Convert one length across feet, millimeters, centimeters, meters, inches and yards.
The international foot is exactly 0.3048 meter, so 1 foot equals exactly 304.8 millimeters.
The Feet to Millimeters conversion connects a U.S./imperial-style length unit with a metric unit commonly used for technical dimensions. The modern international foot is defined as exactly 0.3048 meter. Because one meter contains exactly 1,000 millimeters, one foot equals exactly 304.8 millimeters.
Example: 6 ft × 304.8 = 1,828.8 mm.
Example: 2,438.4 mm ÷ 304.8 = 8 ft.
Because 304.8 is exact, the conversion factor itself does not introduce approximation. Any rounding normally comes from the original measurement or from how many decimals you choose to show.
One international foot equals exactly 304.8 millimeters.
One foot equals 12 inches, and each inch equals exactly 25.4 millimeters.
Multiply by 304.8 for ft→mm or divide by 304.8 for mm→ft.
Calculator cards, tables, FAQs and the hero preview are designed to stay inside the viewport.
This chart provides quick exact and practical reference values for common foot measurements.
| Feet | Millimeters | Centimeters | Meters | Inches |
|---|---|---|---|---|
| 1 ft | 304.8 mm | 30.48 cm | 0.3048 m | 12 in |
| 2 ft | 609.6 mm | 60.96 cm | 0.6096 m | 24 in |
| 3 ft | 914.4 mm | 91.44 cm | 0.9144 m | 36 in |
| 4 ft | 1,219.2 mm | 121.92 cm | 1.2192 m | 48 in |
| 5 ft | 1,524 mm | 152.4 cm | 1.524 m | 60 in |
| 6 ft | 1,828.8 mm | 182.88 cm | 1.8288 m | 72 in |
| 7 ft | 2,133.6 mm | 213.36 cm | 2.1336 m | 84 in |
| 8 ft | 2,438.4 mm | 243.84 cm | 2.4384 m | 96 in |
| 9 ft | 2,743.2 mm | 274.32 cm | 2.7432 m | 108 in |
| 10 ft | 3,048 mm | 304.8 cm | 3.048 m | 120 in |
| 12 ft | 3,657.6 mm | 365.76 cm | 3.6576 m | 144 in |
| 15 ft | 4,572 mm | 457.2 cm | 4.572 m | 180 in |
| 20 ft | 6,096 mm | 609.6 cm | 6.096 m | 240 in |
| 25 ft | 7,620 mm | 762 cm | 7.62 m | 300 in |
| 50 ft | 15,240 mm | 1,524 cm | 15.24 m | 600 in |
| 100 ft | 30,480 mm | 3,048 cm | 30.48 m | 1,200 in |
1 × 304.8 = 304.8 mm.
2.5 × 304.8 = 762 mm.
5 × 304.8 = 1,524 mm.
6 × 304.8 = 1,828.8 mm.
10 × 304.8 = 3,048 mm.
One international inch is exactly 25.4 millimeters, and one foot contains exactly 12 inches. Multiplying 12 by 25.4 gives 304.8 millimeters. The same result follows from the international-foot definition of exactly 0.3048 meter.
This is an exact conversion relationship.
Many building, height and woodworking measurements are written as a combination of feet and inches rather than decimal feet. To convert that mixed format, first convert the feet portion to millimeters and then convert the inches portion using 25.4 millimeters per inch.
Example: 5 ft 8 in = (5 × 304.8) + (8 × 25.4) = 1,727.2 mm.
The third calculator panel above performs this calculation directly.
Construction projects often mix customary and metric dimensions. A site plan may show overall lengths in feet while manufactured components, hardware, glazing, cladding, insulation or imported products are specified in millimeters. Converting the dimensions helps keep the drawing set and product data consistent.
For example, an 8-foot wall height equals 2,438.4 mm. A 10-foot span equals 3,048 mm. When working from detailed plans, retain the original precision and avoid unnecessary rounding until the final reporting step.
Related tools include Feet to Meters, Feet to Centimeters, Inches to Millimeters and Millimeters to Inches.
Engineering drawings and fabrication documents frequently use millimeters because they provide convenient detail without requiring many decimal places. An assembly envelope might be given in feet, while plate sizes, brackets, clearances, fasteners and tolerances are documented in millimeters.
The conversion is also useful when comparing machinery dimensions, equipment footprints, pipe runs, frames, shelving, vehicle components and imported technical specifications.
One foot contains 12 inches, and each inch contains exactly 25.4 millimeters.
To convert millimeters back to feet, divide by 304.8. For example, 1,524 mm ÷ 304.8 = 5 ft, while 2,438.4 mm ÷ 304.8 = 8 ft. If the result is not a whole number, the reverse calculator also shows the same length in feet-and-inches format.
Example: 1,000 mm ≈ 3.280839895 ft.
Feet and inches are widely used in the United States for building dimensions, heights, room sizes and many trades.
Centimeters and millimeters are convenient for detailed dimensions, drawings, products and engineering specifications.
30.48 is centimeters per foot. Millimeters require 304.8.
25.4 converts inches to millimeters. Feet must first account for 12 inches per foot.
For a value like 5 ft 8 in, convert both parts and add them.
Keep the exact factor through the calculation and round only the final displayed value.
Continue with Feet to Meters, Feet to Centimeters, Feet to Inches, Inches to Millimeters, Millimeters to Inches, Meters to Millimeters and Millimeters to Meters.
For official information about SI length and exact customary-to-metric relationships, see NIST SI Units – Length and the BIPM measurement-units resources.
Quick answers about ft to mm conversion, reverse calculation, exact factors and common measurements.