Calcometry
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Inches to Cm Converter
Convert inches to centimeters (and back) instantly. Useful for height, screen sizes, and DIY measurements.
Inches
in
Centimeters
cm
1 in = 2.54 cm
Convert Inches
Quick presets
Centimeters
30.48 cm
12 in = 30.48 cm
- 1 in
- 2.54 cm
- 6 in
- 15.24 cm
- 12 in
- 30.48 cm
- 24 in
- 60.96 cm
- 36 in
- 91.44 cm
- 48 in
- 121.92 cm
- 60 in
- 152.4 cm
- 72 in
- 182.88 cm
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Inches vs centimeters
Inches are part of the imperial system used in the US. Centimeters are metric and common worldwide. The inch-to-cm ratio is exact: 1 in = 2.54 cm.
Common questions
How do I convert height like 5 ft 10 in to centimeters?
Convert feet to inches first (feet × 12), add the remaining inches, then multiply by 2.54. Example: 5 ft 10 in → (5 × 12) + 10 = 70 in → 70 × 2.54 = 177.8 cm.
Are TV and monitor sizes converted the same way?
Screen sizes are measured diagonally. A 55-inch TV is 55 inches corner to corner — about 139.7 cm diagonally, not width or height. Aspect ratio stays the same; only the diagonal length converts.
Is the inch exactly 2.54 cm everywhere?
Yes. The international inch has been defined as exactly 25.4 mm (2.54 cm) since 1959, so US and metric countries use the same conversion factor today.
Paper sizes: is US Letter comparable to A4 if I convert inches to cm?
US Letter is 8.5 × 11 in (about 21.6 × 27.9 cm). A4 is 210 × 297 mm. They are close in width but not identical — do not assume they interchange in printers or binders.