✨ All tools 100% free, no signup, no tracking. Bookmark us! ✨
☕ Love this free tool? ❤️
This Inch to CM Calculator will always be 100% free — no signup, no tracking.
If it's helped you with your projects, buying me a coffee keeps the servers running!
🙏 Your support keeps this free for everyone
Welcome to the Inch to CM Calculator — the most accurate, user-friendly conversion tool on the internet. Whether you're a woodworker measuring materials, a designer converting screen dimensions, a student solving math problems, or just someone who needs to know how many centimeters are in 6 inches, this tool is for you.
Convert inches to centimeters instantly with 2.54 precision
Reverse conversion for metric to imperial needs
Common fractions like ¼, ½, ¾ pre-loaded
Never lose your conversions
Download conversion records
The conversion between inches and centimeters is mathematically exact: 1 inch = 2.54 centimeters. This relationship was established by international agreement in 1959 and is used worldwide.
To convert inches to centimeters: cm = inches × 2.54
To convert centimeters to inches: inches = cm ÷ 2.54
| Inches (in) | Centimeters (cm) | Common Use |
|---|---|---|
| 1 inch | 2.54 cm | Standard ruler width |
| 2 inches | 5.08 cm | Width of a golf ball |
| 3 inches | 7.62 cm | Credit card height |
| 4 inches | 10.16 cm | Post-it note width |
| 5 inches | 12.70 cm | Smartphone length |
| 6 inches | 15.24 cm | Pencil length |
| 7 inches | 17.78 cm | Tablet width |
| 8 inches | 20.32 cm | Standard paper width (1/3 of letter) |
| 9 inches | 22.86 cm | Laptop screen height (small) |
| 10 inches | 25.40 cm | Subway sandwich length |
| 11 inches | 27.94 cm | Paper length (half letter) |
| 12 inches (1 foot) | 30.48 cm | Ruler length |
| 18 inches | 45.72 cm | Arm length (elbow to wrist) |
| 24 inches (2 feet) | 60.96 cm | Standard chair width |
| 36 inches (3 feet) | 91.44 cm | Yard stick length |
| 48 inches (4 feet) | 121.92 cm | Standard door width |
| 60 inches (5 feet) | 152.40 cm | Average human height (5 feet) |
| 72 inches (6 feet) | 182.88 cm | Tall person height |
Woodworkers and machinists often work in fractional inches. Here are the most common conversions:
| Fraction | Decimal Inches | Centimeters |
|---|---|---|
| 1/16" | 0.0625 | 0.1588 cm |
| 1/8" | 0.125 | 0.3175 cm |
| 3/16" | 0.1875 | 0.4763 cm |
| 1/4" | 0.25 | 0.635 cm |
| 5/16" | 0.3125 | 0.7938 cm |
| 3/8" | 0.375 | 0.9525 cm |
| 7/16" | 0.4375 | 1.1113 cm |
| 1/2" | 0.5 | 1.27 cm |
| 9/16" | 0.5625 | 1.4288 cm |
| 5/8" | 0.625 | 1.5875 cm |
| 11/16" | 0.6875 | 1.7463 cm |
| 3/4" | 0.75 | 1.905 cm |
| 13/16" | 0.8125 | 2.0638 cm |
| 7/8" | 0.875 | 2.2225 cm |
| 15/16" | 0.9375 | 2.3813 cm |
| 1" | 1.0 | 2.54 cm |
The imperial system (inches, feet, yards) remains dominant in the United States, Liberia, and Myanmar. Canada and the UK use a hybrid system. The construction industry in the US remains almost entirely imperial, while science and medicine have largely converted to metric.
The inch was originally based on the width of a human thumb. King David I of Scotland defined the inch as the width of a man's thumb at the base of the nail — approximately 2.54 cm, remarkably close to the modern standard.
Before 1959, different countries had slightly different definitions of the inch. The US used the "survey inch" (2.540005 cm), while the UK used a slightly different value. In 1959, the US, UK, Canada, Australia, New Zealand, and South Africa signed the international yard and pound agreement, defining the international inch as exactly 2.54 centimeters.