Femtometer is 1e-15 meter units.
Femtometers to Micrometers Converter — fm to um
Convert Femtometer (fm) to Micrometer (um) using the exact conversion factor (1 femtometer = 1e-9 micrometer). See the formula, worked examples, and conversion table.
Femtometers to Micrometers converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Micrometer is 0.000001 meter units.
Result = input x 1e-15 / 1e-6.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtometers to Micrometers
Femtometer and Micrometer both measure length. Specifically: Femtometer is 1e-15 meter units, and micrometer is 0.000001 meter units.
Formula
micrometers = femtometers × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 femtometer equals 1e-15 base units, and 1 micrometer equals 0.000001 base units, so dividing one by the other gives the direct femtometer-to-micrometer factor of 1e-9.
Simple example
1 fm × 1e-9 = 1e-9 um
1 femtometer = 1e-9 micrometers.
Real-world example
10 fm × 1e-9 = 1e-8 um
10 femtometers = 1e-8 micrometers.
Conversion table
| Femtometer (fm) | Micrometer (um) |
|---|---|
| 1 fm | 1e-9 um |
| 5 fm | 5e-9 um |
| 10 fm | 1e-8 um |
| 21.0975 fm | 2.10975e-8 um |
| 42.195 fm | 4.2195e-8 um |
| 100 fm | 1e-7 um |
Reverse conversion: Micrometer to Femtometer
1e-9 um × 1000000000 = 1 fm
1e-9 micrometers = 1 femtometer.
femtometers = micrometers × 1000000000
For a page dedicated to this direction, see Micrometer to Femtometer.
Understanding the Femtometer (fm)
Femtometer is 1e-15 meter units.
Understanding the Micrometer (um)
Micrometer is 0.000001 meter units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrometers are in 1 femtometer?
1 femtometer equals 1e-9 micrometers, using the exact defined conversion factor rather than an estimate.
How do I convert femtometer to micrometer?
Multiply the femtometer value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert micrometer back to femtometer?
Use the reverse factor: 1 micrometer equals 1,000,000,000 femtometers. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtometer?
Femtometer (fm) is a unit of length.
What is a micrometer?
Micrometer (um) is a unit of length.
Is the femtometer to micrometer conversion exact?
Yes. Both femtometer and micrometer are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 used above is exact to as many digits as you choose to display.