Live Converter
Convert Micrometers to Femtometer Scale
Enter any amount above to see it converted between micrometers (µm) and femtometers (fm), or vice versa.
The Math
How Micrometers and Femtometers Relate
Both the micrometer and the femtometer are metric units, so this relationship works out to a clean power of ten. One micrometer always equals exactly 1,000,000,000 femtometers. How to convert: multiply a micrometer value by 1,000,000,000 to get femtometers. To go the other way, divide a femtometer value by that same number to get micrometers. Worked example: 0.0000000008 µm × 1,000,000,000 = 0.8 fm, roughly the radius of a proton.
Where It's Used
Where Femtometers Actually Get Used
The femtometer describes distances at the scale of atomic nuclei, far smaller than anything a picometer or micrometer could usefully capture.
Atomic Nucleus and Proton Size
A proton measures roughly 0.84 femtometers across, and atomic nuclei generally span a few femtometers depending on the element. Converting a micrometer scale measurement into femtometers occasionally comes up when comparing nuclear physics figures against something built at a laboratory scale.
Particle Physics Measurements
The femtometer, also called a fermi in nuclear physics, is the standard unit for describing distances inside particle accelerators and nuclear reactions. Relating a micrometer scale detector component back to a femtometer scale interaction occasionally comes up in experimental design.
Teaching the Limits of the Metric System
Physics educators sometimes introduce the femtometer specifically to show just how far the metric system's prefixes extend, well past anything visible even under a microscope. Pairing it with a micrometer example helps illustrate the full journey from laboratory scale down to nuclear scale.
Quick Reference
Micrometer to Femtometer Reference Table
Common micrometer values shown alongside their femtometer equivalents.
| Length (µm) | Formula | Result (fm) |
|---|---|---|
| 1.000000e-10 µm to fm | 1.000000e-10 × 1,000,000,000 | 0.1 fm |
| 1.000000e-09 µm to fm | 1.000000e-09 × 1,000,000,000 | 1 fm |
| 1.000000e-08 µm to fm | 1.000000e-08 × 1,000,000,000 | 10 fm |
| 1.000000e-07 µm to fm | 1.000000e-07 × 1,000,000,000 | 100 fm |
| 0.000001 µm to fm | 0.000001 × 1,000,000,000 | 1,000 fm |
| 0.00001 µm to fm | 0.00001 × 1,000,000,000 | 10,000 fm |
| 0.0001 µm to fm | 0.0001 × 1,000,000,000 | 100,000 fm |
| 0.001 µm to fm | 0.001 × 1,000,000,000 | 1,000,000 fm |
| 0.01 µm to fm | 0.01 × 1,000,000,000 | 10,000,000 fm |
| 0.1 µm to fm | 0.1 × 1,000,000,000 | 100,000,000 fm |
| 1 µm to fm | 1 × 1,000,000,000 | 1,000,000,000 fm |
Got Questions?
Frequently Asked Questions
How many femtometers are in a micrometer?
One micrometer equals exactly 1,000,000,000 femtometers, or 10 to the ninth power. This comes directly from the metric system's prefix definitions.
How do I convert micrometers to femtometers?
Multiply the micrometer value by 1,000,000,000 to get femtometers. For example, 0.0000000008 micrometers times that figure equals 0.8 femtometers.
How many micrometers are in a femtometer?
There are exactly 1 divided by 1,000,000,000 micrometers in a single femtometer, an extremely small fraction.
What is a femtometer used to measure?
It's the standard unit for nuclear and particle physics, describing distances like the radius of a proton or the size of an atomic nucleus. It's also commonly called a fermi in that field.
Why is this conversion a clean power of ten?
Because both the micrometer and the femtometer are metric units, and metric units always relate through powers of ten. A conversion involving an imperial unit typically produces a much less tidy multiplier.
Is the femtometer commonly used in physics?
Yes, regularly. Nuclear and particle physics rely on the femtometer to describe distances inside atoms, since nothing larger would be practical at that scale.
Does this conversion factor ever change?
No, both units are permanently defined within the metric system, so the relationship between them is fixed forever, unlike a currency exchange rate that shifts throughout the day.
Can this converter handle numbers this extreme accurately?
Yes, the calculator above is built to display very large and very small results using proper notation so the figure stays readable.
How does a femtometer compare to a picometer?
A femtometer is one million times smaller than a picometer, since femto represents 10 to the negative fifteenth power and pico represents 10 to the negative twelfth power. Picometers describe atomic scale distances, while femtometers describe the nucleus itself.