Inches to Millimeters Conversion Chart
Quick Answer
1 in = 25.4 mm
Formula: Millimeter = Inch x 25.4
Quick values
What is millimeter?
A millimeter (mm) is one-thousandth of a meter, the SI base unit of length. It is used for small, precise measurements and converts directly to inches.
Formulain = mm ÷ 25.4
Key conversions
- 1 inch = 25.4 mm (exact)
- 1 mm ≈ 0.0393701 inches
- 10 mm = 1 centimeter (cm)
- 1,000 mm = 1 meter (m)
Standards, method, and review
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Reviewed by All Unit Conversions Editorial Team. Updated .
Inches to Millimeters Conversion Table
| Inch (in) | Millimeter (mm) |
|---|---|
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 18 in | 457.2 mm |
| 24 in | 609.6 mm |
| 36 in | 914.4 mm |
| 48 in | 1219.2 mm |
| 60 in | 1524 mm |
| 72 in | 1828.8 mm |
| 100 in | 2540 mm |
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Related Converters & Charts
Inches to Millimeters Conversion Chart FAQs
Common questions about the inches to millimeters conversion chart.
How do you convert inch to millimeter?
Multiply the number of inch by 25.4. For example, 1 in = 25.4 mm. The chart above lists the most common values.
What is 1 in in millimeter?
1 in equals 25.4 mm. See the full reference table above for more values, or download the printable PDF.
Can I download this chart as a PDF, CSV, or JSON?
Yes. Use the "Download Conversion Chart (PDF)" button for a printable version, or grab the machine-readable CSV/JSON conversion-factor dataset linked on this page.