Height Conversion Calculator: Feet to cm & More

This height conversion calculator converts between feet/inches, centimeters, meters, and inches. Enter a height in any one unit, and it returns the equivalent values in all other common units, formatted for quick reading.

Formula

The core conversion relies on the exact relationship: 1 inch = 2.54 centimeters (defined in 1959). From that, all other units follow:

• Total inches = feet × 12 + inches
• Centimeters = total inches × 2.54
• Meters = centimeters ÷ 100

Variables: ft = the feet portion of the height; inch = the remaining inches (0–11). The calculator first combines the two parts into a single number of inches, then multiplies by 2.54 to get centimeters.

Worked Example

Using the defaults (5 ft 9 in):

1. Total inches = 5 × 12 + 9 = 60 + 9 = 69 inches
2. Centimeters = 69 × 2.54 = 175.26 cm
3. Meters = 175.26 ÷ 100 = 1.75 m

The calculator rounds centimeters to one decimal, so it shows 175.3 cm. That matches the output block.

Why Heights Are Measured Differently Around the World

The United States, Canada, and the UK commonly use feet and inches for personal height, while most other countries use centimeters or meters. This split causes frequent confusion in international contexts: medical records, clothing size charts, sports statistics, and job applications often require a conversion. Understanding both systems helps you interpret data from anywhere.

How to Use the Calculator

Enter the feet value in the first box and the inches value in the second. If you only know your height in centimeters, you can still use the calculator to reverse the conversion: try different feet/inch combinations until the centimeters output matches your known height. Alternatively, you can mentally divide centimeters by 2.54 to get total inches, then divide by 12 to get feet and remainder inches.

For example, 170 cm ÷ 2.54 = 66.93 inches. That is 5 feet (60 inches) plus 6.93 inches, so approximately 5′7″.

Common Mistakes to Avoid

• Mixing feet and inches in one number: 5.9 feet is not the same as 5′9″. 5.9 feet = 5′10.8″. Always separate the feet and inches.
• Forgetting the 12-inch foot: A foot has 12 inches, not 10. This is the most common source of error.
• Rounding too early: If you round 69 inches to 70 before multiplying by 2.54, you get 177.8 cm instead of 175.3 cm—a difference of 2.5 cm.
• Using 2.5 instead of 2.54: That shortcut introduces a 1.6% error, which adds up to about 2.8 cm for a 175 cm person.

Precision and Limits of the Formula

The 2.54 factor is exact by definition, so the conversion itself has no inherent error. The only rounding occurs when you decide how many decimal places to show. For most purposes (clothing, ID documents, general conversation), rounding to the nearest centimeter or half-inch is sufficient. However, for medical or scientific measurements, you may need more precision—use the full decimal without rounding.

One limitation: the calculator assumes a whole number of inches for the input. If you measure in fractions (e.g., 5′9.5″), you can enter 9.5 in the inches field, and the calculator will handle it correctly.

Alternatives and Related Conversions

If you need to convert weight as well as height, many BMI calculators accept height in either feet/inches or centimeters. For other length conversions (e.g., miles to kilometers), the same principle applies: use the exact factor (1 mile = 1.609344 km). For quick mental estimates, remember that 1 inch ≈ 2.5 cm and 1 foot ≈ 30 cm—good for rough checks, not for precise records.

Frequently Asked Questions

How many cm is 5′10″?

5′10″ = (5×12 + 10) = 70 inches. 70 × 2.54 = 177.8 cm. So 5′10″ is 177.8 centimeters.

What is 180 cm in feet and inches?

180 cm ÷ 2.54 = 70.87 inches. 70.87 ÷ 12 = 5 feet with a remainder of 10.87 inches. So 180 cm ≈ 5′10.9″, usually rounded to 5′11″.

Is 1 inch exactly 2.54 cm?

Yes, since 1959 the inch has been defined as exactly 2.54 centimeters. This is an international agreement, so the conversion is exact, not approximate.

Why do some countries use feet and inches?

Historical usage and cultural inertia. The US, Canada, and the UK never fully adopted the metric system for everyday personal measurements. Even in metric countries, older generations may still use feet/inches informally.

How do I convert my height to meters?

Take your height in centimeters and divide by 100. For example, 175 cm = 1.75 m. If you start with feet/inches, first convert to centimeters using the calculator, then divide by 100.

What is the average height in the world?

Global averages vary by country and sex, but as of recent data, the global mean for adult men is about 171 cm (5′7″) and for women about 159 cm (5′3″). These figures come from national health surveys and vary over time.

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in ft | Feet | ft | 5 | 0
in inch | Inches | in | 9 | 0
out cm | Centimeters | cm | ((ft * 12) + inch) * 2.54 | 1
out m | Meters | m | ((ft * 12) + inch) * 0.0254 | 2
out inches_total | Total inches | in | (ft * 12) + inch | 0