Micrometer is 0.000001 meter units.
Micrometers to Femtometers Converter — um to fm
Convert Micrometer (um) to Femtometer (fm) using the exact conversion factor (1 micrometer = 1,000,000,000 femtometer). See the formula, worked examples, and conversion table.
Micrometers to Femtometers 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.
Femtometer is 1e-15 meter units.
Result = input x 1e-6 / 1e-15.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Micrometers to Femtometers
Micrometer and Femtometer both measure length. Specifically: Micrometer is 0.000001 meter units, and femtometer is 1e-15 meter units.
Formula
femtometers = micrometers × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 micrometer equals 0.000001 base units, and 1 femtometer equals 1e-15 base units, so dividing one by the other gives the direct micrometer-to-femtometer factor of 1000000000.
Simple example
1 um × 1000000000 = 1,000,000,000 fm
1 micrometer = 1,000,000,000 femtometers.
Real-world example
10 um × 1000000000 = 10,000,000,000 fm
10 micrometers = 10,000,000,000 femtometers.
Conversion table
| Micrometer (um) | Femtometer (fm) |
|---|---|
| 1 um | 1,000,000,000 fm |
| 5 um | 5,000,000,000 fm |
| 10 um | 10,000,000,000 fm |
| 21.0975 um | 21,097,500,000 fm |
| 42.195 um | 42,195,000,000 fm |
| 100 um | 100,000,000,000 fm |
Reverse conversion: Femtometer to Micrometer
1 fm × 1e-9 = 1e-9 um
1 femtometer = 1e-9 micrometers.
micrometers = femtometers × 1e-9
For a page dedicated to this direction, see Femtometer to Micrometer.
Understanding the Micrometer (um)
Micrometer is 0.000001 meter units.
Understanding the Femtometer (fm)
Femtometer is 1e-15 meter units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtometers are in 1 micrometer?
1 micrometer equals 1,000,000,000 femtometers, using the exact defined conversion factor rather than an estimate.
How do I convert micrometer to femtometer?
Multiply the micrometer value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert femtometer back to micrometer?
Use the reverse factor: 1 femtometer equals 1e-9 micrometers. You can also use the swap control in the converter above to flip the direction instantly.
What is a micrometer?
Micrometer (um) is a unit of length.
What is a femtometer?
Femtometer (fm) is a unit of length.
Is the micrometer to femtometer conversion exact?
Yes. Both micrometer and femtometer are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.