Length Converter
Enter a length, choose its unit and see it in millimeters, centimeters, meters, inches and feet at once. The page lists the exact factors, worked examples and a reference table for common sizes.
Last updated November 2, 2026
Result
180 cm = 70.8661 in = 5.9055 ft
| Unit | Length |
|---|---|
| Millimeters | 1,800 mm |
| Centimeters | 180 cm |
| Meters | 1.8 m |
| Inches | 70.8661 in |
| Feet | 5.9055 ft |
Exact definitions: 1 in = 25.4 mm and 1 ft = 304.8 mm. Results are rounded to 4 decimal places.
Show the work
Formula: millimeters = length x mm per unit; target = millimeters / mm per target unit
- Entered: 180 cm.
- Millimeters first: 1 cm = 10 mm, so 180 x 10 = 1,800 mm.
- Meters: 1,800 mm / 1,000 (1 m = 1,000 mm) = 1.8 m.
- Inches: 1,800 mm / 25.4 (1 in = 25.4 mm) = 70.8661 in.
- Feet: 1,800 mm / 304.8 (1 ft = 304.8 mm) = 5.9055 ft.
Result: 180 cm = 70.8661 in = 5.9055 ft
How length units convert
1 in = 25.4 mm · 1 ft = 12 in = 304.8 mm · 1 m = 100 cm = 1,000 mm
The metric units are powers of ten apart. A centimeter is 10 millimeters and a meter is 100 centimeters, so moving between them only shifts the decimal point. 150 cm is 1,500 mm or 1.5 m.
The inch is defined as exactly 25.4 millimeters, and a foot is 12 inches, which makes it exactly 304.8 millimeters. To convert between systems, multiply by the factor in the direction you need: inches times 25.4 give millimeters, and millimeters divided by 25.4 give inches. This converter holds each length in millimeters and divides by the target unit, so any pair of the five units is one step.
See how we calculate for the formulas, sources and review schedule behind every calculator.
Also useful alongside this calculator: Temperature Converter, Square Footage Calculator and Volume Calculator.
Inches to centimeters and back
Because 1 inch is exactly 2.54 centimeters, multiply inches by 2.54 to get centimeters and divide centimeters by 2.54 to get inches. A 15 inch laptop screen is 15 × 2.54 = 38.1 cm across the diagonal, and a 30 cm ruler is 30 ÷ 2.54 ≈ 11.81 inches.
For a quick mental estimate, 10 cm is about 4 inches, and 1 inch is about 2.5 cm. The estimate drifts on large values, so use the exact factor for anything you will cut or order.
Feet and inches in one measurement
People often write a height as feet and inches, such as 5 ft 11 in. Convert the whole thing to inches first: 5 × 12 + 11 = 71 inches. That is 71 × 2.54 = 180.34 cm, or about 1.80 m.
To read a decimal number of feet as feet and inches, multiply the part after the decimal point by 12. 5.5 ft is 5 ft plus 0.5 × 12 = 6 inches, so 5 ft 6 in. The converter gives feet as a decimal, so apply this step when you need the feet-and-inches form.
Which unit suits which job
Millimeters suit small parts, screw sizes and sheet thickness. Centimeters suit clothing, furniture and small objects, and meters suit rooms, fabric and distances you can walk. Inches and feet are the everyday units in the United States for height, screens, lumber and room dimensions.
When a plan mixes units, convert every figure to one unit before adding anything. A board 2 ft long plus a 15 cm gap is not 17 of anything, but 60.96 cm plus 15 cm is 75.96 cm.
Precision and rounding
The factors are exact by definition, so the only rounding comes from showing the result. This converter shows up to 4 decimal places and trims trailing zeros. A tape measure reads to about a millimeter or a sixteenth of an inch, so figures finer than that are not meaningful in practice.
When you convert a measurement for a purchase or cut, round the final answer, not the steps in between.
How to use the Length Converter
- Enter the length as a number of 0 or more.
- Choose its unit: millimeters, centimeters, meters, inches or feet.
- Read the length in all five units, then use Copy, Print or Share.
Worked example
To convert 180 cm to inches and feet, divide by 2.54 to get about 70.87 inches, then divide by 12 to get about 5.91 feet. The same height is 1,800 mm or 1.8 m. Going the other way, 6 ft is 6 × 304.8 = 1,828.8 mm, which is 182.88 cm or 1.8288 m. Both examples use the same exact factors, so the answers agree.
| Length | mm | cm | in | ft |
|---|---|---|---|---|
| 1 inch | 25.4 | 2.54 | 1 | 0.0833 |
| 1 foot | 304.8 | 30.48 | 12 | 1 |
| 10 cm | 100 | 10 | 3.9370 | 0.3281 |
| 1 meter | 1,000 | 100 | 39.3701 | 3.2808 |
| 180 cm | 1,800 | 180 | 70.8661 | 5.9055 |
Frequently asked questions
How many centimeters are in an inch?
Exactly 2.54 centimeters, which is 25.4 millimeters. This is a definition, not a rounded measurement.
How many inches are in a foot and a meter?
A foot is exactly 12 inches. A meter is 1,000 ÷ 25.4 ≈ 39.3701 inches, or about 3.2808 feet.
How do I convert centimeters to feet?
Divide the centimeters by 30.48. For example, 180 cm ÷ 30.48 ≈ 5.91 feet, which is about 5 ft 11 in.
Can I convert a negative length?
No. A length is 0 or more, so the converter shows an error for negative values instead of a result.
Are my numbers stored anywhere?
No. The conversion runs in your browser, and nothing you enter is saved or uploaded unless you choose to share a link.