Length and Area
kmtoμm
Convert kilometres (km) to micrometres (μm).
Factor1 km = 1e+9 μm
Converter
km
Accepts numbers or expressions, e.g. 150 + 14.7
Result
μm
Rendered to 6 significant figures.
Formula
Formula
μm = km × 1e+9
Multiply any value in kilometres by 1e+9 to obtain the value in micrometres.
Worked example
Convert 1 km to μm.
- 01Start with 1 km.
- 02Multiply by the conversion factor: 1 × 1e+9 = 1e+9 μm.
Result1 km = 1e+9 μm
Conversion table
| km | μm |
|---|---|
| 1 | 1e+9 |
| 2 | 2e+9 |
| 5 | 5e+9 |
| 10 | 1e+10 |
| 20 | 2e+10 |
| 50 | 5e+10 |
| 100 | 1e+11 |
| 200 | 2e+11 |
| 500 | 5e+11 |
| 1000 | 1e+12 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from km to μm?
1 km equals 1e+9 μm. To convert, multiply the value in kilometres by 1e+9.
How do I convert 1 km to μm?
1 km = 1e+9 μm. For any value, multiply by 1e+9.
How do I convert μm back to km?
Divide by the same factor — or equivalently, multiply by 1e-9. So 1 μm = 1e-9 km.
When would I need to convert kilometre to micrometre?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both km and μm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).