Nearest fractional-inch choices
When a metric dimension must become a practical imperial fraction, compare the approximation error before choosing.
OneFreePlace · Tool #112
Inches to centimetres, built for decimal and fractional measurements.
Convert inches, centimetres, millimetres, metres and feet with exact math. Type 3 5/8", 7¾ in, 92 mm or 12,7 cm — then see the nearest practical fractional-inch equivalents too.
✓ Exact 1 in = 2.54 cm✓ Mixed & Unicode fractions✓ Nearest 1/8–1/64 inch✓ Batch conversion
Inches to Centimeters Converter
Exact · fraction-aware · local
Smart converter
Enter a measurement
Try 3 5/8", 7¾ in, 92 mm, 12,7 cm, or a simple decimal.
Display precisionExact conversion underneath
No approximation in the base conversion
12 inches × 2.54 = exactly 30.48 cm. Any difference you see comes only from display rounding or choosing a practical fractional-inch approximation.
Centimetres
Exact definition30.48
cm
12 in × 2.54 = 30.48 cm
Nearest 1/16 inch12"0 mm approximation error
Formula used
centimetres = inches × 2.54
12 inches on a 0–16 inch ruler75%
Batch converter
Paste one measurement per line. Units are optional; bare numbers use the unit selected above.
Fraction reference
Common inch fractions translated into exact millimetres and centimetres.
| Inches | Decimal in | Millimetres | Centimetres | Metres |
|---|
i
Definition usedThe international inch is exactly 25.4 millimetres, so 1 inch is exactly 2.54 centimetres. Fractional-inch cards are approximations only when the original metric value does not land exactly on that fraction.