inches to cm – convert inches to centimetres
Convert inches to cm (inches to centimetres) for height, screen sizes, woodworking, and any imperial measurements you need in metric. This page opens the main length converter with in → cm pre-selected.
Open the interactive in → cm converter:
Use main converter (in → cm) or switch to cm → inYou can also switch to feet, yards, metres, kilometres and miles using the dropdowns on the homepage.
Quick reference: inches to cm
The exact formula is cm = inches × 2.54. Common values include:
| Inches (in) | Centimetres (cm, approx.) |
|---|---|
| 20 in | 50.8 cm |
| 30 in | 76.2 cm |
| 40 in | 101.6 cm |
| 60 in | 152.4 cm |
| 70 in | 177.8 cm |
| 72 in | 182.9 cm |
Why convert inches to centimetres?
People typically convert inches to cm when they:
- Know their height in feet and inches but need centimetres for forms.
- Compare screen sizes (inches) with desk space measured in centimetres.
- Work with international building or engineering drawings in metric.
- Buy products from US websites that list dimensions only in inches.
Other length converters on this site
inches to cm FAQ
Is 1 inch exactly 2.54 centimetres?
Yes. Since 1959, 1 inch has been defined exactly as 2.54 cm, so this conversion is exact, not an approximation.
How many cm are in 5 foot 10?
5 ft 10 in is 70 inches. 70 × 2.54 = 177.8 cm, often rounded to 178 cm.
What’s the quickest way to estimate inches to cm?
Multiply inches by 2.5 for a quick estimate. For more accuracy, use 2.54 or this online converter.
Page last updated: 2 December 2025.