Common Inch to Centimeter Conversions

4 min read•June 1, 2025•Reviewed: June 1, 2026

✓Reviewed by Apex Conversion Editorial Team · Last reviewed June 1, 2026

This reference covers the most commonly needed inch-to-centimeter conversions. The formula is cm = in × 2.54 (exact). Screen sizes, furniture dimensions, clothing sizes, and hardware fittings all frequently require this conversion.

Key anchors: 1 in = 2.54 cm, 12 in = 30.48 cm (1 foot), 36 in = 91.44 cm (1 yard).

Fractional and Common Inches

   in       cm         in      cm
──────   ──────     ──────  ──────
  0.25    0.635       9    22.860
  0.5     1.270      10    25.400
  1       2.540      11    27.940
  2       5.080      12    30.480
  3       7.620      18    45.720
  4      10.160      24    60.960
  5      12.700      30    76.200
  6      15.240      36    91.440
  7      17.780      48   121.920
  8      20.320      60   152.400
                     72   182.880

Common Applications

Screen diagonals: US sizes in inches; European spec sheets use centimeters. 24 in = 60.96 cm, 27 in = 68.58 cm, 32 in = 81.28 cm, 43 in = 109.22 cm, 55 in = 139.70 cm, 65 in = 165.10 cm, 75 in = 190.50 cm.

Clothing and body measurements: waist size 32 in = 81.28 cm; inseam 30 in = 76.2 cm; collar 15.5 in = 39.37 cm. Paper sizes: US Letter is 8.5 × 11 in = 21.59 × 27.94 cm; US tabloid is 11 × 17 in = 27.94 × 43.18 cm.

Quick Tips

✓
Multiply inches by 2.5 for a fast estimate — off by 1.6%.
✓
1 inch = 2.54 cm — a single number to memorize above all others in this conversion.
✓
6 in = 15.24 cm, 12 in = 30.48 cm — two useful anchors for common lengths.
✓
Screen size: TV diagonals in inches are widely used in the US; multiply by 2.54 for the European cm spec.