Feet To Mm Calculator 2026
Instantly convert feet and inches to millimeters, centimeters, and meters. Perfect for engineering, DIY projects, construction, and imperial to metric length conversions.
Length Conversion
Enter your distance in feet and inches to convert to millimeters
Enter the whole number of feet.
Enter the remaining inches (0-11).
Choose how many decimal places to show in the results.
Your Length Conversion
Millimeters, centimeters, meters, and exact formula breakdown
Enter your feet and inches above and click Convert to Millimeters to reveal your metric length conversion results.
Common Length Conversions
Quickly reference standard length conversions between feet, inches, and millimeters for everyday and construction use.
| Feet & Inches | Millimeters (mm) | Centimeters (cm) | Common Examples |
|---|---|---|---|
| 1 ft 0 in | 304.8 mm | 30.48 cm | Standard ruler length (12 inches) |
| 2 ft 0 in | 609.6 mm | 60.96 cm | Height of a standard desk |
| 3 ft 0 in | 914.4 mm | 91.44 cm | Width of a doorway |
| 5 ft 0 in | 1524.0 mm | 152.4 cm | Height of a standard door |
| 5 ft 7 in | 1701.8 mm | 170.18 cm | Average adult human height |
| 6 ft 0 in | 1828.8 mm | 182.88 cm | Standard ceiling height (partial) |
| 10 ft 0 in | 3048.0 mm | 304.8 cm | Room width, shipping container |
| 100 ft 0 in | 30480.0 mm | 3048.0 cm | Tennis court length |
Feet To Mm Calculator FAQ
Everything you need to know about converting feet and inches to millimeters, understanding imperial to metric conversions, and tracking your measurements.
To convert feet to millimeters, multiply your length value by 304.8. For example, if you have 5 feet, the calculation is 5 × 304.8 = 1,524 millimeters. This calculator automates this process for you instantly.
There are exactly 304.8 millimeters in one foot. This is because there are 12 inches in a foot, and each inch is exactly 25.4 millimeters (12 × 25.4 = 304.8).
First, convert the feet to inches by multiplying by 12, then add the remaining inches. Finally, multiply the total inches by 25.4 to get millimeters. For example, 5 feet 7 inches is (5 × 12) + 7 = 67 inches. 67 × 25.4 = 1,701.8 mm.
Converting feet to millimeters is essential in engineering, architecture, manufacturing, and DIY projects where precise metric measurements are required. It ensures compatibility with metric tools, materials, and international standards.
Yes, the conversion is exact. Since 1959, the international yard and pound agreement defined the inch as exactly 25.4 millimeters. Therefore, any conversion from feet or inches to millimeters using this factor is 100% precise.
To convert millimeters back to feet, divide your millimeter value by 304.8. For example, 1,524 mm ÷ 304.8 = 5 feet. To get the remaining inches, multiply the decimal part by 12.