Megahertz is 1000000 hertz units.
Megahertz to Femtohertz Converter — MHz to fHz
Convert Megahertz (MHz) to Femtohertz (fHz) using the exact conversion factor (1 megahertz = 1e+21 femtohertz). See the formula, worked examples, and conversion table.
Megahertz to Femtohertz converter
Converter
Scientific Units Converter
Convert SI derived units, scientific notation-friendly units, atomic units, and lab measurements.
Context values
Some unit families need one extra value for a physically accurate result.
Femtohertz is 1e-15 hertz units.
Result = input x 1e+6 / 1e-15.
Frequency units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Megahertz to Femtohertz
Megahertz and Femtohertz are both scientific-measurement units, spanning everything from atomic and laboratory scales to astronomical distances — the kind of conversion that comes up constantly in physics, chemistry, and astronomy when a result needs to move between conventions used in different subfields. Specifically: Megahertz is 1000000 hertz units, and femtohertz is 1e-15 hertz units.
Formula
femtohertz = megahertz × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 megahertz equals 1000000 base units, and 1 femtohertz equals 1e-15 base units, so dividing one by the other gives the direct megahertz-to-femtohertz factor of 1e+21.
Simple example
1 MHz × 1e+21 = 1e+21 fHz
1 megahertz = 1e+21 femtohertz.
Real-world example
10 MHz × 1e+21 = 1e+22 fHz
10 megahertz = 1e+22 femtohertz.
Conversion table
| Megahertz (MHz) | Femtohertz (fHz) |
|---|---|
| 0.001 MHz | 1e+18 fHz |
| 0.01 MHz | 1e+19 fHz |
| 1 MHz | 1e+21 fHz |
| 10 MHz | 1e+22 fHz |
| 100 MHz | 1e+23 fHz |
| 1,000 MHz | 1e+24 fHz |
Reverse conversion: Femtohertz to Megahertz
1e+21 fHz × 1e-21 = 1 MHz
1e+21 femtohertz = 1 megahertz.
megahertz = femtohertz × 1e-21
For a page dedicated to this direction, see Femtohertz to Megahertz.
Understanding the Megahertz (MHz)
Megahertz is 1000000 hertz units.
Understanding the Femtohertz (fHz)
Femtohertz is 1e-15 hertz units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtohertz are in 1 megahertz?
1 megahertz equals 1e+21 femtohertz, using the exact defined conversion factor rather than an estimate.
How do I convert megahertz to femtohertz?
Multiply the megahertz value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert femtohertz back to megahertz?
Use the reverse factor: 1 femtohertz equals 1e-21 megahertz. You can also use the swap control in the converter above to flip the direction instantly.
What is a megahertz?
Megahertz (MHz) is a unit of scientific units.
What is a femtohertz?
Femtohertz (fHz) is a unit of scientific units.
Is the megahertz to femtohertz conversion exact?
Yes. Both megahertz and femtohertz are defined by fixed standards rather than physical artifacts, so the factor of 1e+21 used above is exact to as many digits as you choose to display.
Why does this category span everything from atomic to astronomical scales?
Scientific work spans an enormous range of physical scales, from atomic distances (measured in angstroms or atomic mass units) to interstellar distances (measured in astronomical units or parsecs), so this category groups SI-derived and scale-specific units that researchers commonly need to convert between within their field.