MM to Inches & Fraction Converter
Convert millimeters, decimal inches and inch fractions. See the rounding difference before using a ruler measurement.
Try 600 mm, 18.5 mm, 3/4 in or 23 5/8 in. Explicit mm/in suffixes take priority over the input unit.
- Millimeters
- 600 mm
- Decimal inches
- 23.622047244094 in
- Ruler fraction
- 23 5/8 in
Rounded value minus input: 0.075 mm
Only the displayed ruler fraction is rounded. Decimal inches are displayed to at most 12 decimal places. Switching input units retains the original physical value until you edit it. Other tool preferences stay unchanged.
Calculations stay in this browser. No file, account or measurement upload is needed.
| in | mm |
|---|---|
| 1/4 | 6.35 |
| 1/2 | 12.7 |
| 23/32 | 18.25625 |
| 3/4 | 19.05 |
| 1 | 25.4 |
MM to Inches & Fraction Converter
How mm and inches relate
1 in = 25.4 mm exactly. Divide millimeters by 25.4 for inches; multiply inches by 25.4 for millimeters.
18 mm is not 3/4 inch
18 mm, 3/4 in (19.05 mm) and 23/32 in (18.25625 mm) are different sizes. Use the measured thickness of your material for joints and cutting plans.