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Free online length converter. Instantly convert between feet, meters, inches, centimeters (cm), millimeters, and miles with exact imperial & metric formulas.
See how your measurement looks on a standard ruler
| Centimeter (cm) | Inch (in) | Inch (Reverse) | Centimeter Equivalent | Action |
|---|---|---|---|---|
| 0.1 cm | 0.03937 in | 0.1 in | 0.25400 cm | |
| 0.5 cm | 0.19685 in | 0.5 in | 1.27000 cm | |
| 1 cm | 0.39370 in | 1 in | 2.54000 cm | |
| 2 cm | 0.78740 in | 2 in | 5.08000 cm | |
| 5 cm | 1.96850 in | 5 in | 12.70000 cm | |
| 10 cm | 3.93701 in | 10 in | 25.40000 cm | |
| 20 cm | 7.87402 in | 20 in | 50.80000 cm | |
| 50 cm | 19.68504 in | 50 in | 127.00000 cm | |
| 100 cm | 39.37008 in | 100 in | 254.00000 cm | |
| 500 cm | 196.85039 in | 500 in | 1,270.00000 cm | |
| 1000 cm | 393.70079 in | 1000 in | 2,540.00000 cm |
Symbol: nm. Commonly used in: metric.
Symbol: µm. Commonly used in: metric.
Symbol: mm. Commonly used in: metric.
Symbol: cm. Commonly used in: metric.
Symbol: m. Commonly used in: metric.
Every conversion starts with the standard baseline rate between these two units:
Multiply your entered number by the conversion rate to calculate the exact target value:
The result is neatly rounded to your preferred decimal setting so it is clear and ready to use:
| Unit Name | Symbol | System | Conversion Rate | Common Uses |
|---|---|---|---|---|
| Nanometer | nm | metric | 1 nm = 1.000000 nm | Everyday, home, and school measurements in Length. |
| Micrometer | µm | metric | 1 µm = 1,000.000000 nm | Everyday, home, and school measurements in Length. |
| Millimeter | mm | metric | 1 mm = 1,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Centimeter | cm | metric | 1 cm = 10,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Meter | m | metric | 1 m = 1,000,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Kilometer | km | metric | 1 km = 1,000,000,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Inch | in | imperial | 1 in = 25,400,000.000000 nm | Everyday, home, and school measurements in Length. |
| Foot | ft | imperial | 1 ft = 304,800,000.000000 nm | Everyday, home, and school measurements in Length. |
| Yard | yd | imperial | 1 yd = 914,400,000.000000 nm | Everyday, home, and school measurements in Length. |
| Mile | mi | imperial | 1 mi = 1,609,344,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Nautical Mile | nmi | other | 1 nmi = 1,852,000,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Light Year | ly | other | 1 ly = 9,460,730,472,000,000,000,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Furlong | fur | imperial | 1 fur = 201,168,000,000.000000 nm | Everyday, home, and school measurements in Length. |
| Angstrom | Å | other | 1 Å = 0.100000 nm | Everyday, home, and school measurements in Length. |
Early length units were based on human body parts—such as a foot, a forearm (cubit), or an armspan (fathom). In 1799, the meter was created in France so that everyone around the world could use the same clear decimal standard.
Remember that sea miles (nautical miles: 1,852 m) are longer than regular road miles (statute miles: 1,609 m).
In 1959, the United States, Britain, and other countries signed the International Yard and Pound Agreement. They set 1 yard to exactly 0.9144 meters, which makes 1 inch exactly 25.4 millimeters.
Divide the centimeter number by 2.5 (or divide by 10 and multiply by 4). For example: 50 cm ÷ 2.5 = 20 inches (exact answer is 19.69 inches).
1 Kilometer is 1,000 meters (about 0.62 miles). 1 Mile is 5,280 feet (about 1.61 kilometers). A quick rule of thumb: 5 km is about 3.1 miles, and 10 km is about 6.2 miles.
Every calculation uses trusted, standard definitions so your results are 100% accurate for school, home, work, and recipes.
