Convert fractional inches to millimeters and back. Use the quick converter for any size, or reference the full charts from 1/32" to 3" and 1 to 60 mm. All values are based on 1 inch = 25.4 mm.
Quick Converter
Inches ⇄ Millimeters
Enter a fraction, decimal, or metric value. Select any row in the charts below to load it here.
Convert fromReference Chart
Fraction – Inches to Millimeters
| Fraction (in) | Decimal (in) | Millimeters |
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No matching fractions.
Reference Chart
Millimeters to Inches
| MM | Inches | Nearest |
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No matching values.
Based on 1 inch = 25.4 mm (exact). Decimal inches and millimeters rounded to 4 places; mm-to-inch values to 3 places. Nearest fractions shown to 1/32".