CM to Inches Converter (cm → in)
Convert centimeters to inches instantly with our precise, free calculator. Whether you're converting your height, checking product dimensions, or working on a cross-border project, this tool gives you exact results with full formula transparency.
The CM to Inches Formula
The relationship between centimeters and inches is exact and internationally defined. Since 1959, 1 inch has been defined as exactly 2.54 centimeters. This means there is zero approximation in the conversion factor — it is a fixed, legal definition.
Reverse (inches to cm):
Why 2.54?
The value 2.54 comes from the international yard and pound agreement of 1959, which redefined the inch in metric terms. Before this standardization, different countries used slightly different inch lengths. The unified definition of 1 inch = 25.4 mm = 2.54 cm ensures scientific and commercial consistency worldwide.
Converting to Feet and Inches
Once you have total inches, you can split them into feet + inches: divide by 12 for the feet part, and the remainder is the inches part. Our calculator shows both formats automatically.
Step-by-Step Examples
- Value: 10 cm
- Formula: in = 10 ÷ 2.54
- Result: 3.937 inches
10 ÷ 2.54 = 3.93701 in
- Value: 170 cm
- Formula: in = 170 ÷ 2.54 = 66.929 inches
- As feet+in: 66.929 ÷ 12 = 5 ft remainder 6.929 in
- Result: 66.93 inches (5′ 6.93″)
170 ÷ 2.54 = 66.929 in → 5 ft 6.93 in
180 ÷ 2.54 = 70.866 in → 5 ft 10.87 in
2.54 ÷ 2.54 = 1.000 in
CM to Inches Conversion Table
| Centimeters (cm) | Inches (in) | Feet + Inches | Feet (decimal) |
|---|---|---|---|
| 1 cm | 0.3937 in | 0′ 0.39″ | 0.0328 ft |
| 2.54 cm | 1.0000 in | 0′ 1″ | 0.0833 ft |
| 5 cm | 1.9685 in | 0′ 1.97″ | 0.1640 ft |
| 10 cm | 3.9370 in | 0′ 3.94″ | 0.3281 ft |
| 15 cm | 5.9055 in | 0′ 5.91″ | 0.4921 ft |
| 20 cm | 7.8740 in | 0′ 7.87″ | 0.6562 ft |
| 25 cm | 9.8425 in | 0′ 9.84″ | 0.8202 ft |
| 30 cm | 11.8110 in | 0′ 11.81″ | 0.9843 ft |
| 30.48 cm | 12.0000 in | 1′ 0″ | 1.0000 ft |
| 50 cm | 19.6850 in | 1′ 7.69″ | 1.6404 ft |
| 100 cm | 39.3701 in | 3′ 3.37″ | 3.2808 ft |
| 150 cm | 59.0551 in | 4′ 11.06″ | 4.9213 ft |
| 155 cm | 61.0236 in | 5′ 1.02″ | 5.0853 ft |
| 160 cm | 62.9921 in | 5′ 2.99″ | 5.2493 ft |
| 162 cm | 63.7795 in | 5′ 3.78″ | 5.3150 ft |
| 165 cm | 64.9606 in | 5′ 4.96″ | 5.4134 ft |
| 167 cm | 65.7480 in | 5′ 5.75″ | 5.4790 ft |
| 170 cm | 66.9291 in | 5′ 6.93″ | 5.5774 ft |
| 172 cm | 67.7165 in | 5′ 7.72″ | 5.6430 ft |
| 175 cm | 68.8976 in | 5′ 8.90″ | 5.7415 ft |
| 177 cm | 69.6850 in | 5′ 9.69″ | 5.8071 ft |
| 178 cm | 70.0787 in | 5′ 10.08″ | 5.8399 ft |
| 180 cm | 70.8661 in | 5′ 10.87″ | 5.9055 ft |
| 183 cm | 72.0472 in | 6′ 0.05″ | 6.0039 ft |
| 185 cm | 72.8346 in | 6′ 0.83″ | 6.0696 ft |
| 190 cm | 74.8031 in | 6′ 2.80″ | 6.2336 ft |
| 200 cm | 78.7402 in | 6′ 6.74″ | 6.5617 ft |
Popular Searches
- 160 cm to inches: 62.99 in (5′ 3″)
- 165 cm to inches: 64.96 in (5′ 4.96″)
- 170 cm to inches: 66.93 in (5′ 6.93″)
- 175 cm to inches: 68.90 in (5′ 8.90″)
- 178 cm to inches: 70.08 in (5′ 10.08″)
- 180 cm to inches: 70.87 in (5′ 10.87″)
- 183 cm to inches: 72.05 in (6′ 0.05″)
Height Chart: CM to Inches
This chart is specifically designed for height conversion — the most common reason people convert centimeters to inches. If you know your height in centimeters and want to express it in the foot-and-inch format used in the US and UK, use this chart.
| Height (cm) | Total Inches | ft + in | Notes |
|---|---|---|---|
| 150 cm | 59.06 in | 4′ 11.1″ | Short adult |
| 155 cm | 61.02 in | 5′ 1.0″ | — |
| 160 cm | 62.99 in | 5′ 3.0″ | — |
| 163 cm | 64.17 in | 5′ 4.2″ | Avg US female |
| 165 cm | 64.96 in | 5′ 5.0″ | — |
| 168 cm | 66.14 in | 5′ 6.1″ | Avg global female |
| 170 cm | 66.93 in | 5′ 6.9″ | — |
| 175 cm | 68.90 in | 5′ 8.9″ | Avg US male |
| 178 cm | 70.08 in | 5′ 10.1″ | — |
| 180 cm | 70.87 in | 5′ 10.9″ | Tall male |
| 183 cm | 72.05 in | 6′ 0.0″ | 6 feet exactly |
| 185 cm | 72.83 in | 6′ 0.8″ | — |
| 190 cm | 74.80 in | 6′ 2.8″ | Very tall |
| 198 cm | 77.95 in | 6′ 6.0″ | NBA range |
| 213 cm | 83.86 in | 7′ 0.0″ | 7 feet |
Use Cases
International Height Comparison
Most countries record height in centimeters on official documents (passports, ID cards, medical records). When communicating with people in the US or UK, converting to feet and inches is essential for clarity. A height of 175 cm means little to an American audience — but "5 feet 9 inches" is immediately understood.
Product Dimensions
International products often list dimensions in centimeters. When buying furniture, TVs, appliances, or clothing online from overseas stores, converting to inches helps you visualize the size. A 127 cm TV diagonal = 50 inches — a familiar benchmark for US shoppers.
Medical and Fitness
BMI calculators, fitness apps, and health records in the US use inches (or feet + inches) for height. Converting from a metric measurement ensures your BMI is calculated correctly. For example, a height of 170 cm = 66.93 inches is used in the standard BMI formula: BMI = (weight_lbs × 703) / (height_in²).
Architecture and Interior Design
Ceiling heights, door heights, and furniture dimensions are discussed in feet/inches in the US but cm in most of the world. A 244 cm ceiling is exactly 8 feet — the US standard. A 91 cm countertop height is 36 inches — the US kitchen standard.
Frequently Asked Questions
1 inch = 2.54 centimeters exactly, by international definition since 1959.
Divide by 2.54. Formula: in = cm ÷ 2.54. Example: 30.48 cm ÷ 2.54 = 12 in.
170 cm = 66.929 inches, or 5 feet 6.93 inches.
180 cm = 70.87 inches = 5 feet 10.87 inches (approximately 5′ 11″).
183 cm = 72.047 inches = exactly 6 feet 0.047 inches — essentially 6 feet flat.
100 cm = 39.3701 inches. This is slightly more than 3 feet 3 inches.
The factor (2.54 cm/in) is exact. However, most cm values don't divide evenly by 2.54, so the result in inches is often a repeating decimal — rounded to practical precision (e.g., 4 decimal places).
5 cm = 1.9685 inches. Just under 2 inches.
A quick mental shortcut: multiply cm by 0.4 (or divide by 2.5). For example, 50 cm × 0.4 = 20 inches (exact answer: 19.69 in). This gives a rough estimate within about 2%.
30 cm = 11.811 inches. This is just under 1 foot (12 inches). A standard ruler is 30 cm = ~11.81 inches.