Convert cm to inches exactly, with feet+inches and the nearest ruler fraction.
Exact factor: 1 inch = 2.54 cm. The fraction below is handy for rulers and tape measures.
Converted result
How to use this tool
Pick a direction: CM → Inches, Inches → CM, or Feet + Inches.
Type your value in centimetres (or inches, or feet and inches separately).
The result updates instantly, with the feet+inches breakdown and the nearest fraction.
Open Advanced options to change decimal places or the fraction precision (1/8, 1/16 or 1/32 inch).
Formula & worked example
100 cm ÷ 2.54 = 39.37 inches, which is 3 ft 3.37 in, or about 39 3/8 in to the nearest 1/8 inch. In the other direction, 12 inches × 2.54 = 30.48 cm.
Limitations — read this before you rely on it
This converts length only, using the exact international definition (1 in = 2.54 cm). Displayed values are rounded to your chosen decimal places and the fraction is a nearest-value approximation, so converting back and forth may differ in the last digit shown. It does not convert area or volume (square/cubic units need different factors).
Frequently asked questions
Type the centimetres and read the inches instantly, with the feet+inches breakdown and the nearest fraction for rulers and tape measures.
Divide centimetres by 2.54. For example, 50 cm ÷ 2.54 = 19.69 inches. The factor is exact by the international definition of the yard.
Yes — it is exact, not rounded. One inch is defined as exactly 2.54 centimetres, so every conversion on this page is exact before display rounding.
The “Nearest fraction” result rounds to the closest 1/16 inch by default; open Advanced options to use 1/8 or 1/32 inch instead.
Yes. Switch to “Inches → CM” or enter feet and inches together in “Feet + Inches” mode.