How to Convert Inches to CM
To convert inches to cm, multiply the inch value by 2.54. This is the only formula you need, because 1 inch equals exactly 2.54 centimeters. For example, 70 inches × 2.54 = 177.80 cm.
This guide explains the formula, shows worked examples for common heights, and provides a full reference table. It also covers the most common mistakes and when to use this conversion.
Quick Answer
Inches to centimeters formula: cm = inches × 2.54
The number gets larger when converting inches to cm, because one centimeter is shorter than one inch.
How to Convert Inches to CM Step by Step
The conversion factor between inches and centimeters is fixed. Follow these 3 steps for any inch value.
1. Write the value in inches
Start with the total inches you want to convert. If a height is 5 feet 8 inches, first convert to total inches: (5 × 12) + 8 = 68 inches.
2. Multiply by 2.54
Use the formula: cm = inches × 2.54. The result will always be larger than the original inch value. If your centimeter result is smaller, you divided instead of multiplied.
3. Round after the calculation
Keep the full decimal through all steps, then round at the end. Two decimal places work for most reference tables and forms.
Inches to CM Formula and Worked Examples
The formula cm = inches × 2.54 works for whole numbers and decimals. Here are 4 common height examples.
60 inches in cm
60 × 2.54 = 152.40 cm
66 inches in cm
66 × 2.54 = 167.64 cm
70 inches in cm
70 × 2.54 = 177.80 cm
72 inches in cm
72 × 2.54 = 182.88 cm
Example: convert 5 feet 7 inches to cm
Convert the feet to total inches first: 5 × 12 = 60. Add 7 inches: 60 + 7 = 67 inches. Multiply by 2.54: 67 × 2.54 = 170.18 cm. So 5 feet 7 inches equals exactly 170.18 centimeters.
Inches to CM Conversion Table
Use this reference table for common height values. All centimeter values are rounded to two decimals.
| Inches | Centimeters | Reference |
|---|---|---|
| 1 in | 2.54 cm | One inch |
| 5 in | 12.70 cm | Short span |
| 12 in | 30.48 cm | One foot |
| 24 in | 60.96 cm | Two feet |
| 60 in | 152.40 cm | 5 feet |
| 62 in | 157.48 cm | 5 ft 2 in |
| 64 in | 162.56 cm | 5 ft 4 in |
| 66 in | 167.64 cm | 5 ft 6 in |
| 68 in | 172.72 cm | 5 ft 8 in |
| 70 in | 177.80 cm | 5 ft 10 in |
| 72 in | 182.88 cm | 6 feet |
| 74 in | 187.96 cm | 6 ft 2 in |
| 76 in | 193.04 cm | 6 ft 4 in |
Common Inches to CM Conversion Mistakes
Dividing instead of multiplying
To convert inches to cm, multiply by 2.54. Dividing converts in the wrong direction. A quick check: your cm result should always be larger than your inch starting value.
Forgetting to convert feet to inches first
If a height is in feet and inches, flatten it to total inches before multiplying by 2.54. Multiply feet by 12 and add the remaining inches.
Using an incorrect multiplier
Using 2.5 instead of 2.54 creates visible errors at common heights. At 70 inches, the difference is 2.80 cm, which is enough to change a medical record or clothing size.
Related Height Conversion Resources
This page belongs to the Height Conversion Guides silo.
Supporting guides
Relevant calculators
Frequently Asked Questions
How do you convert inches to cm?
Multiply the inch value by 2.54. Example: 70 inches × 2.54 = 177.80 cm.
What is the inches to cm formula?
The formula is cm = inches × 2.54. One inch is exactly 2.54 centimeters by international definition.
How many cm is 5 feet 7 inches?
First convert to total inches: (5 × 12) + 7 = 67 inches. Then multiply: 67 × 2.54 = 170.18 cm.
Is 1 inch equal to 2.54 cm exactly?
Yes. The international yard and pound agreement of 1959 defined 1 inch as exactly 2.54 centimeters. This is a fixed constant, not an approximation.
What is 72 inches in cm?
72 inches × 2.54 = 182.88 cm. That is the height of exactly 6 feet.
Can I estimate inches to cm without a calculator?
Multiply by 2.5 for a quick estimate, then add 1.6% to correct the shortfall. For accuracy, always use 2.54.