MM
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INCHES
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Inches → MM
CM → Inches
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Inches to MM
INCHES TO
MM
Convert decimal or fractional inches to exact millimeter values. Supports all standard US fractions.
Tools:
MM → Inches
Inches → MM
CM → Inches
Fractions
Batch
Size Charts
Decimal Inches → MM
// Enter decimal inches (e.g. 1.5, 0.375, 2.25)
Inches (Decimal)
in
Enter inches
=
⇄
=
Millimeters
mm
Result
—
Inches
—
Millimeters
—
Centimeters
—
Feet & Inches
Fractional Inch → MM
// Build a fraction and see its exact mm value
Whole Inches
Fraction
0 (no fraction)
1/2
1/4
3/4
1/8
3/8
5/8
7/8
1/16
3/16
5/16
7/16
9/16
11/16
13/16
15/16
1/32
3/32
5/32
7/32
9/32
11/32
13/32
15/32
17/32
19/32
21/32
23/32
25/32
27/32
29/32
31/32
Convert
Result
—
—
Common Inch → MM Reference
// All standard US fractional inches with exact mm values
Inches (Fraction)
Inches (Decimal)
Millimeters
Centimeters
Common Use
Formula
// Inches to mm conversion
Inches → MM
mm
= inches × 25.4
Multiply any inch value by 25.4. Example: 2.5" × 25.4 = 63.5 mm
Fractional Inches → MM
mm
= (whole + numerator ÷ denominator) × 25.4
Example: 1 3/8" = (1 + 3/8) × 25.4 = 1.375 × 25.4 = 34.925 mm
FAQ — Inches to MM
// Common questions