CalcPairsCentimeters to Inches Converter (cm to in)
30 centimetres is 11.811024 inches. The inch is defined as exactly 2.54 cm, so centimetres ÷ 2.54 gives inches — and inches × 2.54 gives centimetres back.
Type in either box — the other side answers instantly. Everything is worked out in your browser; your numbers are never uploaded anywhere.
How this conversion works
Type in either box: centimetres become inches, inches become centimetres, and the other side answers as you type. The swap button exchanges the two values when you want to run the conversion the other way.
Centimetres rule the metric world — IKEA shelves, European clothing, school rulers — while inches still rule American screens, tyres and tools. Because the link between them is an exact definition rather than a measurement, every figure on this page is exact too: the table below runs the whole ruler, 1 to 100 cm.
The exact formula
inches = centimetres ÷ 2.54
1 inch = 2.54 cm exactly — fixed by international agreement in 1959 and never rounded since. The reverse is centimetres = inches × 2.54.
Centimeters to Inches conversion table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 | 0.393701 |
| 2 | 0.787402 |
| 3 | 1.181102 |
| 4 | 1.574803 |
| 5 | 1.968504 |
| 6 | 2.362205 |
| 7 | 2.755906 |
| 8 | 3.149606 |
| 9 | 3.543307 |
| 10 | 3.937008 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 11 | 4.330709 |
| 12 | 4.724409 |
| 13 | 5.11811 |
| 14 | 5.511811 |
| 15 | 5.905512 |
| 16 | 6.299213 |
| 17 | 6.692913 |
| 18 | 7.086614 |
| 19 | 7.480315 |
| 20 | 7.874016 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 21 | 8.267717 |
| 22 | 8.661417 |
| 23 | 9.055118 |
| 24 | 9.448819 |
| 25 | 9.84252 |
| 26 | 10.23622 |
| 27 | 10.629921 |
| 28 | 11.023622 |
| 29 | 11.417323 |
| 30 | 11.811024 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 31 | 12.204724 |
| 32 | 12.598425 |
| 33 | 12.992126 |
| 34 | 13.385827 |
| 35 | 13.779528 |
| 36 | 14.173228 |
| 37 | 14.566929 |
| 38 | 14.96063 |
| 39 | 15.354331 |
| 40 | 15.748031 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 41 | 16.141732 |
| 42 | 16.535433 |
| 43 | 16.929134 |
| 44 | 17.322835 |
| 45 | 17.716535 |
| 46 | 18.110236 |
| 47 | 18.503937 |
| 48 | 18.897638 |
| 49 | 19.291339 |
| 50 | 19.685039 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 51 | 20.07874 |
| 52 | 20.472441 |
| 53 | 20.866142 |
| 54 | 21.259843 |
| 55 | 21.653543 |
| 56 | 22.047244 |
| 57 | 22.440945 |
| 58 | 22.834646 |
| 59 | 23.228346 |
| 60 | 23.622047 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 61 | 24.015748 |
| 62 | 24.409449 |
| 63 | 24.80315 |
| 64 | 25.19685 |
| 65 | 25.590551 |
| 66 | 25.984252 |
| 67 | 26.377953 |
| 68 | 26.771654 |
| 69 | 27.165354 |
| 70 | 27.559055 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 71 | 27.952756 |
| 72 | 28.346457 |
| 73 | 28.740157 |
| 74 | 29.133858 |
| 75 | 29.527559 |
| 76 | 29.92126 |
| 77 | 30.314961 |
| 78 | 30.708661 |
| 79 | 31.102362 |
| 80 | 31.496063 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 81 | 31.889764 |
| 82 | 32.283465 |
| 83 | 32.677165 |
| 84 | 33.070866 |
| 85 | 33.464567 |
| 86 | 33.858268 |
| 87 | 34.251969 |
| 88 | 34.645669 |
| 89 | 35.03937 |
| 90 | 35.433071 |
| Centimeters (cm) | Inches (in) |
|---|---|
| 91 | 35.826772 |
| 92 | 36.220472 |
| 93 | 36.614173 |
| 94 | 37.007874 |
| 95 | 37.401575 |
| 96 | 37.795276 |
| 97 | 38.188976 |
| 98 | 38.582677 |
| 99 | 38.976378 |
| 100 | 39.370079 |
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 — it is a definition, not an approximation. A US inch, a UK inch and an inch anywhere else are all the same 2.54 cm.
How do I convert inches back to centimetres?
Multiply by 2.54. Twelve inches is 30.48 cm, which is also why a foot is exactly 30.48 cm.
What is 50 cm in inches?
19.685039 inches — just under 19¾ inches. You can check it in the table below.