Inches (in) to Centimeters (cm) Conversion
Inches
The inch is a unit of length equal to exactly 25.4 millimetres, standardised under the international yard and pound agreement of 1959. It is the standard unit for screen diagonal measurements in consumer electronics, tire widths, pipe diameters in plumbing, and calibre in firearms. In typography, one inch contains exactly 72 PostScript points, fundamental to digital print and graphic design.
Centimeters
The centimetre is a unit of length equal to one hundredth of a metre (10⁻² m), derived using the SI prefix centi- (from Latin centum, meaning hundred). It is widely used in everyday measurement of body height, garment sizing, and small objects, and is the standard unit in medicine, tailoring, and interior design. In the CGS (centimetre-gram-second) system that preceded modern SI, the centimetre served as the fundamental unit of length, giving rise to derived units such as the dyne and erg still encountered in physics literature.
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.1 in | 0.254 cm |
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 5 in | 12.70 cm |
| 10 in | 25.40 cm |
| 20 in | 50.80 cm |
| 30 in | 76.20 cm |
| 50 in | 127.00 cm |
| 100 in | 254.00 cm |
| 1000 in | 2,540.00 cm |
Frequently Asked Questions (FAQ)
How many centimeters are in 1 inches?
1 inches (in) is exactly 2.54 centimeters (cm).
How do I convert inches to centimeters?
Multiply the value in inches by 2.54 to get the result in centimeters. Or use the converter above — type any number and see the result instantly.
How do I convert inches to centimetres exactly?
Multiply inches by 2.54 to get centimetres. The factor 2.54 is exact by international definition — no rounding involved. Quick reference table: 1 in = 2.54 cm, 6 in = 15.24 cm, 12 in (1 ft) = 30.48 cm, 24 in = 60.96 cm, 36 in (1 yd) = 91.44 cm. Height references: 5 ft 10 in (70 in) = 177.80 cm; 6 ft (72 in) = 182.88 cm; 6 ft 2 in (74 in) = 187.96 cm.
How do I convert a height in feet and inches to centimetres in one step?
Convert to total inches first: multiply feet by 12 and add the extra inches. Then multiply total inches by 2.54. Example: 5 ft 9 in = (5 × 12) + 9 = 69 inches × 2.54 = 175.26 cm. Full height reference: 5′0″ = 152.4 cm, 5′4″ = 162.56 cm, 5′6″ = 167.64 cm, 5′9″ = 175.26 cm, 6′0″ = 182.88 cm, 6′4″ = 193.04 cm. These are exact values — no approximation is needed since 2.54 is defined exactly.