Millimeters to inches conversion table
| millimeters | inches |
|---|---|
| 1 mm | 0.0394 in |
| 3 mm | 0.1181 in |
| 5 mm | 0.1969 in |
| 6 mm | 0.2362 in |
| 10 mm | 0.3937 in |
| 12 mm | 0.4724 in |
| 15 mm | 0.5906 in |
| 20 mm | 0.7874 in |
| 25 mm | 0.9843 in |
| 30 mm | 1.1811 in |
| 50 mm | 1.9685 in |
| 75 mm | 2.9528 in |
| 100 mm | 3.937 in |
| 150 mm | 5.9055 in |
| 200 mm | 7.874 in |
| 300 mm | 11.811 in |
How to convert millimeters to inches
One millimeter is 0.03937 inches, so 1 mm = 0.0394 in. The formula is:
in = mm ÷ 25.4
Two worked examples:
- 10 mm = 10 ÷ 25.4 = 0.3937 in
- 30 mm = 30 ÷ 25.4 = 1.1811 in
How to use the converter
- 1
Type the number you have in millimeters (mm) into the left box.
- 2
Read the result in inches (in) in the right box. It updates as you type, and you can also type in the right box to convert back.
- 3
Press the swap button to flip the units, or copy the result to paste it into your plan notes.
Floor plan tips
Architectural drawings in metric countries use millimeters: a 2,040 mm door leaf is 80.31 in, close to the 80 in (6 ft 8 in) US standard door height.
Wall thickness is a good example. A 100 mm partition wall is 3.94 in and a 200 mm block wall is 7.87 in.
Millimeters matter for small parts such as hinges, trim and tile joints: 3 mm is 0.12 in and 6 mm is 0.24 in, close to 1/8 in and 1/4 in.
Millimeters to inches: FAQ
How many inches are in 1 millimeter?
1 millimeter is exactly 0.03937 inches. That is 1 mm = 0.0394 in rounded to 4 decimals.
How do I convert millimeters to inches?
Use the formula in = mm ÷ 25.4. For example, 12 mm is 0.4724 in.
How many inches is 50 millimeters?
50 mm is 1.9685 in.
How many inches is a 2,040 mm door height?
A 2,040 mm door is 80.31 in (6 ft 8.3 in), close to the 80 in (6 ft 8 in) US standard door height.
Is this millimeters to inches converter accurate?
Yes. The factor is exact, because the inch is defined as 25.4 mm and the foot as 0.3048 m. The result shows up to 4 decimals and runs in your browser, so nothing you type is sent anywhere.
More converters
Need the plan itself?
Describe your home and get a floor plan in about a minute, then turn it into a 3D view. The first preview is free.