Kilohertz is 1000 hertz units.
Kilohertz to Femtohertz Converter — kHz to fHz
Convert Kilohertz (kHz) to Femtohertz (fHz) using the exact conversion factor (1 kilohertz = 1e+18 femtohertz). See the formula, worked examples, and conversion table.
Kilohertz to Femtohertz converter
Converter
Frequency Converter
Convert hertz, SI frequency prefixes, RPM, beats per minute, and angular frequency.
Context values
Some unit families need one extra value for a physically accurate result.
Femtohertz is 1e-15 hertz units.
Result = input x 1000 / 1e-15.
Frequency uses hertz as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilohertz to Femtohertz
Kilohertz and Femtohertz both describe how fast something cycles or rotates, and the conversion is a routine part of reading a car tachometer or motor spec sheet against a scientific frequency figure. Specifically: Kilohertz is 1000 hertz units, and femtohertz is 1e-15 hertz units.
Formula
femtohertz = kilohertz × 1e+18
This factor comes from each unit's defined relationship to the category's base unit: 1 kilohertz equals 1000 base units, and 1 femtohertz equals 1e-15 base units, so dividing one by the other gives the direct kilohertz-to-femtohertz factor of 1e+18.
Simple example
1 kHz × 1e+18 = 1e+18 fHz
1 kilohertz = 1e+18 femtohertz.
Real-world example
1,000 kHz × 1e+18 = 1e+21 fHz
1,000 kilohertz = 1e+21 femtohertz.
Conversion table
| Kilohertz (kHz) | Femtohertz (fHz) |
|---|---|
| 60 kHz | 6e+19 fHz |
| 600 kHz | 6e+20 fHz |
| 1,000 kHz | 1e+21 fHz |
| 3,000 kHz | 3e+21 fHz |
| 6,000 kHz | 6e+21 fHz |
| 10,000 kHz | 1e+22 fHz |
Reverse conversion: Femtohertz to Kilohertz
1e+18 fHz × 1e-18 = 1 kHz
1e+18 femtohertz = 1 kilohertz.
kilohertz = femtohertz × 1e-18
For a page dedicated to this direction, see Femtohertz to Kilohertz.
Understanding the Kilohertz (kHz)
Kilohertz is 1000 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 kilohertz?
1 kilohertz equals 1e+18 femtohertz, using the exact defined conversion factor rather than an estimate.
How do I convert kilohertz to femtohertz?
Multiply the kilohertz value by 1e+18. The converter above does this instantly to whatever precision you set.
How do I convert femtohertz back to kilohertz?
Use the reverse factor: 1 femtohertz equals 1e-18 kilohertz. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilohertz?
Kilohertz (kHz) is a unit of frequency.
What is a femtohertz?
Femtohertz (fHz) is a unit of frequency.
Is the kilohertz to femtohertz conversion exact?
Yes. Both kilohertz and femtohertz are defined by fixed standards rather than physical artifacts, so the factor of 1e+18 used above is exact to as many digits as you choose to display.