Formula. inches = centimetres ÷ 2.54.
Relationship. 1 inch = 2.54 cm.
Worked example. 10 cm = 3.937008 in.
📏
Cm to Inches Converter.
Convert cm to inches instantly with this free calculator. 1 inch = 2.54 cm.
Quick
cm
Copied ✓ in
Copied ✓ Reference Table
| mm | cm | m | km | in | ft | yd | mi | nmi |
|---|---|---|---|---|---|---|---|---|
| 0.1 | 0.01 | 0.0001 | 1.000000e-7 | 0.0039370079 | 0.000328084 | 0.0001093613 | 6.213712e-8 | 5.399568e-8 |
| 1 | 0.1 | 0.001 | 0.000001 | 0.0393700787 | 0.0032808399 | 0.0010936133 | 6.213712e-7 | 5.399568e-7 |
| 10 | 1 | 0.01 | 0.00001 | 0.3937007874 | 0.032808399 | 0.010936133 | 0.0000062137 | 0.0000053996 |
| 100 | 10 | 0.1 | 0.0001 | 3.937008 | 0.3280839895 | 0.1093613298 | 0.0000621371 | 0.0000539957 |
| 1000 | 100 | 1 | 0.001 | 39.370079 | 3.28084 | 1.093613 | 0.0006213712 | 0.0005399568 |
| 10000 | 1000 | 10 | 0.01 | 393.700787 | 32.808399 | 10.936133 | 0.0062137119 | 0.005399568 |
| 100000 | 10000 | 100 | 0.1 | 3937.0079 | 328.08399 | 109.36133 | 0.0621371192 | 0.0539956803 |
How to convert cm to inches
cm to inches conversion table
| cm | in |
|---|---|
| 1 | 0.3937007874 |
| 2 | 0.7874015748 |
| 3 | 1.181102 |
| 4 | 1.574803 |
| 5 | 1.968504 |
| 6 | 2.362205 |
| 7 | 2.755906 |
| 8 | 3.149606 |
| 9 | 3.543307 |
| 10 | 3.937008 |
| 15 | 5.905512 |
| 20 | 7.874016 |
| 25 | 9.84252 |
| 30 | 11.811024 |
| 40 | 15.748031 |
| 50 | 19.685039 |
| 60 | 23.622047 |
| 70 | 27.559055 |
| 75 | 29.527559 |
| 80 | 31.496063 |
| 90 | 35.433071 |
| 100 | 39.370079 |
| 120 | 47.244094 |
| 150 | 59.055118 |
| 180 | 70.866142 |
FAQ
Frequently Asked Questions
How do I convert centimetres to inches?
Divide the centimetre value by 2.54, because 1 inch is defined as exactly 2.54 cm. For example, 10 cm ÷ 2.54 ≈ 3.94 inches.
How many inches is 30 cm?
30 cm equals 11.81 inches (30 ÷ 2.54). That is just under one foot, which is exactly 30.48 cm.
Is the inch the same in the US, UK and India?
Yes. Since the 1959 international agreement, 1 inch = 2.54 cm exactly everywhere, so a centimetre-to-inch conversion gives the same answer in every country.
What is a quick way to estimate cm to inches?
Divide by 2.5 in your head for a close estimate — it is within about 1.6% of the exact value. For example, 50 cm ÷ 2.5 = 20 inches, while the exact figure is 19.69 inches.
Related tools
Popular Conversions
Tips
- → Type in either field — conversion works both ways.
- → Use the swap button to reverse the direction instantly.
- → Click "Share" to copy a link with your value pre-filled.