Centimeter is 0.01 meter units.
Centimeters to Femtometers Converter — cm to fm
Convert Centimeter (cm) to Femtometer (fm) using the exact conversion factor (1 centimeter = 1e+13 femtometer). See the formula, worked examples, conversion table, history, and common uses.
Centimeters 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 0.01 / 1e-15.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Centimeters to Femtometers
Centimeter and Femtometer both measure length. Centimeter is most often used for everyday small-object and body measurement (height, clothing sizes) outside the us.
Formula
femtometers = centimeters × 1e+13
This factor comes from each unit's defined relationship to the category's base unit: 1 centimeter equals 0.01 base units, and 1 femtometer equals 1e-15 base units, so dividing one by the other gives the direct centimeter-to-femtometer factor of 1e+13.
Simple example
1 cm × 1e+13 = 1e+13 fm
1 centimeter = 1e+13 femtometers.
Real-world example
10 cm × 1e+13 = 1e+14 fm
10 centimeters = 1e+14 femtometers.
Conversion table
| Centimeter (cm) | Femtometer (fm) |
|---|---|
| 1 cm | 1e+13 fm |
| 5 cm | 5e+13 fm |
| 10 cm | 1e+14 fm |
| 21.0975 cm | 2.10975e+14 fm |
| 42.195 cm | 4.2195e+14 fm |
| 100 cm | 1e+15 fm |
Reverse conversion: Femtometer to Centimeter
1e+13 fm × 1e-13 = 1 cm
1e+13 femtometers = 1 centimeter.
centimeters = femtometers × 1e-13
For a page dedicated to this direction, see Femtometer to Centimeter.
Understanding the Centimeter
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-length unit worldwide except the US
Uses of the Centimeter today
- Everyday small-object and body measurement (height, clothing sizes) outside the US
- Construction and manufacturing tolerances internationally
History of the Centimeter
The centimeter follows directly from the meter via the 'centi-' SI prefix (10⁻²), introduced with the metric system in the 1790s.
Historical origin. Centimeter was not the invention of a single named person; it developed through the process described above.
Understanding the Femtometer (fm)
Femtometer is 1e-15 meter units.
Centimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'centi-' as the prefix for 10⁻².
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtometers are in 1 centimeter?
1 centimeter equals 1e+13 femtometers, using the exact defined conversion factor rather than an estimate.
How do I convert centimeter to femtometer?
Multiply the centimeter value by 1e+13. The converter above does this instantly to whatever precision you set.
How do I convert femtometer back to centimeter?
Use the reverse factor: 1 femtometer equals 1e-13 centimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a centimeter?
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
What is a femtometer?
Femtometer (fm) is a unit of length.
Is the centimeter to femtometer conversion exact?
Yes. Both centimeter and femtometer are defined by fixed standards rather than physical artifacts, so the factor of 1e+13 used above is exact to as many digits as you choose to display.
Where is the centimeter still used today?
Standard small-length unit worldwide except the US