How to Convert Micrometres to Centimetres (µm to cm)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert micrometres into centimetres by hand, with examples and a quick-reference table.
The conversion
To convert micrometres to centimetres, multiply the value by 1.000000e-04. To go the other way, divide by the same number (or multiply by 10,000). Because the factor is tiny, scientific notation keeps the numbers manageable.
Centimetres = micrometres × 1.000000e-04
Worked examples
- 3 µm = 0.0003 cm
- 12.5 µm = 0.00125 cm
- 75 µm = 0.0075 cm
Micrometres to Centimetres table
| Micrometres | Centimetres |
|---|---|
| 1 µm | 1.000000e-4 cm |
| 2 µm | 0.0002 cm |
| 5 µm | 0.0005 cm |
| 10 µm | 0.001 cm |
| 20 µm | 0.002 cm |
| 25 µm | 0.0025 cm |
| 50 µm | 0.005 cm |
| 100 µm | 0.01 cm |
| 250 µm | 0.025 cm |
| 500 µm | 0.05 cm |
| 1,000 µm | 0.1 cm |
Common questions
Is µm to cm exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Centimetres to Micrometres converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the Micrometres to Centimetres Converter or browse all length converters.
Run your own numbers: Micrometres to Centimetres Converter