Convert millimeters to feet, feet to millimeters and other length units in one step. For mm to ft use ft = mm ÷ 304.8; for ft to mm use mm = ft × 304.8. The converter also covers cm, m, km, inches, yards, miles, micrometers and nanometers.
For millimeters to feet, divide by 304.8. Formula: ft = mm ÷ 304.8. Example: 1800 mm = 5.9055 ft, or about 5 ft 10.87 in.
Formula & how it works
All inputs are first normalized to meters (the SI base unit for length), then each target unit is computed using its conversion factor. This avoids chained rounding errors when converting between arbitrary pairs.
Conversion table — common lengths
| m | cm | mm | in | ft | yd |
|---|
Frequently asked questions
How do I convert mm to ft?
Divide millimeters by 304.8 because 1 foot is exactly 304.8 mm. Example: 1000 mm ÷ 304.8 = 3.28084 ft.
How do I convert ft to mm?
Multiply feet by 304.8. Example: 6 ft × 304.8 = 1828.8 mm. For inches first, 1 ft = 12 in and 1 in = 25.4 mm.
How do I convert centimeters to inches?
Divide centimeters by 2.54. One inch is defined as exactly 25.4 millimeters, so 1 cm = 1/2.54 ≈ 0.3937 inches. Example: 180 cm ÷ 2.54 ≈ 70.87 in.
How do I convert feet to meters?
Multiply feet by 0.3048. One international foot is exactly 0.3048 meters by definition. Example: 6 ft × 0.3048 = 1.8288 m.
How many millimeters are in an inch?
Exactly 25.4 mm. That equivalence has been the international definition of the inch since 1959 and is used by all ISO and ANSI standards.
How do I convert kilometers to miles?
Multiply km by 0.621371. One mile equals 1609.344 meters, so 1 km ≈ 0.6214 mi. Example: 10 km × 0.621371 ≈ 6.2137 mi.
What is a micrometer and when is it used?
A micrometer (µm), also called a micron, is one millionth of a meter (10⁻⁶ m). It is used for thin film thickness, optical wavelengths, particle sizes and manufacturing tolerances. 1 µm = 0.001 mm = 10 000 Å.
Why convert everything through meters?
The meter is the SI base unit for length, so it acts as a neutral hub: value × factor(input) = meters, then meters × factor(output) = target. Chaining pair conversions directly would accumulate rounding errors.
Enter any length, choose the input unit, and every equivalent updates at once. Examples: 304.8 mm = 1 ft; 1000 mm = 3.28084 ft; 1 ft = 304.8 mm; 6 ft = 1828.8 mm = 1.8288 m. Click a result card to copy only the number.