3 in = 7.62 cm (inch → centimeter)
3 in = 7.62 cm
3 inches (in) equals 7.62 centimeters (cm). The conversion uses the exact factor 2.54: 3 × 2.54 = 7.62.
Centimeters = Inches × 2.54How 3 inches compares to its arithmetic neighbours, converted to centimeters.
| Relation | inches | centimeters |
|---|---|---|
| ÷10 | 0.3 in | 0.762 cm |
| ÷2 (half) | 1.5 in | 3.81 cm |
| ×1 (this value) | 3 in | 7.62 cm |
| ×2 (double) | 6 in | 15.24 cm |
| ×5 | 15 in | 38.1 cm |
| ×10 | 30 in | 76.2 cm |
Inches to centimetres is fixed by the 1959 international yard agreement: 1 in is exactly 2.54 cm. Multiply inches by 2.54 and you are done — no rounding, no regional variant. The conversion shows up in TV sizes (a 55 in screen has a 139.7 cm diagonal), monitor specs, US recipe measurements borrowed by metric kitchens, and shoe inserts. If your source is decimal inches (3.75 in), convert directly; if it is fractional (3-3/4 in), expand the fraction first.
Parents tracking a baby's growth chart get length measurements from a US paediatrician in inches but the WHO growth percentile charts most apps default to are plotted in centimetres. A 21 in newborn length is 53.3 cm, and plugging the wrong unit into a growth app silently shifts the child's percentile ranking by dozens of points. Always confirm which unit the chart expects before entering a single measurement — the app rarely warns you if you feed it the wrong one.
Start with your value in inches.
Multiply the inch value by 2.54. This is the exact conversion factor from inches to centimeters.
The product is your value in centimeters. For example, 5 in × 2.54 = 12.7 cm.
The exact factor from inches to centimeters is 2.54.
Centimeters = Inches × 2.54
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.1 in | 0.254 cm |
| 0.25 in | 0.635 cm |
| 0.5 in | 1.27 cm |
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 7 in | 17.78 cm |
| 8 in | 20.32 cm |
| 9 in | 22.86 cm |
| 10 in | 25.4 cm |
| 11 in | 27.94 cm |
| 12 in | 30.48 cm |
| 13 in | 33.02 cm |
| 14 in | 35.56 cm |
| 15 in | 38.1 cm |
| 16 in | 40.64 cm |
| 18 in | 45.72 cm |
| 20 in | 50.8 cm |
| 22 in | 55.88 cm |
| 24 in | 60.96 cm |
| 25 in | 63.5 cm |
| 28 in | 71.12 cm |
| 30 in | 76.2 cm |
| 32 in | 81.28 cm |
| 36 in | 91.44 cm |
| 40 in | 101.6 cm |
| 45 in | 114.3 cm |
| 48 in | 121.92 cm |
| 50 in | 127 cm |
| 60 in | 152.4 cm |
| 70 in | 177.8 cm |
| 75 in | 190.5 cm |
| 80 in | 203.2 cm |
| 90 in | 228.6 cm |
| 100 in | 254 cm |
| 125 in | 317.5 cm |
| 150 in | 381 cm |
| 200 in | 508 cm |
| 250 in | 635 cm |
| 300 in | 762 cm |
| 400 in | 1016 cm |
| 500 in | 1270 cm |
| 600 in | 1524 cm |
| 750 in | 1905 cm |
| 800 in | 2032 cm |
| 900 in | 2286 cm |
| 1000 in | 2540 cm |
A US quarter coin is about 1 inch in diameter. A standard sheet of US Letter paper is 8.5 × 11 inches. A 13-inch laptop has a screen diagonal of 13 inches. In centimeters, that gives you: 1 in = 2.54 cm, 10 in = 25.4 cm, 100 in = 254 cm.
The inch (in) is a unit of length in the imperial and US customary systems, defined as exactly 25.4 millimeters since the 1959 international yard and pound agreement. It is the standard unit in the US for screen sizes, lumber, fasteners, and personal height when given in feet-and-inches form. Twelve inches make one foot.
The centimeter (cm) is a metric unit of length equal to one-hundredth of a meter. It is the most common everyday unit outside the US for measuring small to mid-sized objects, body dimensions like height when stated in metric, fabric, and TV diagonals. A US quarter coin is about 2.4 cm wide; an average adult thumb is around 6 cm long.
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