📻 Frequency Conversion Calculator 2026
Convert between hertz, RPM, radians/second, and more
1000 Hz = 1 kHz
Formula: value × 0.001
Period (T = 1/f)
0.001 seconds = 1 ms
📊 All Conversions
Common Frequency Conversions
| From | To | Multiply by |
|---|---|---|
| 1 kHz | Hz | 1,000 |
| 1 MHz | Hz | 1,000,000 |
| 1 GHz | Hz | 1,000,000,000 |
| 1 Hz | RPM | 60 |
| 1 RPM | Hz | 0.01667 |
| 1 Hz | rad/s | 6.2832 (2π) |
| 1 rad/s | Hz | 0.1592 (1/2π) |
Understanding Frequency
📻 Hertz (Hz)
SI unit of frequency. 1 Hz = 1 cycle per second. Named after Heinrich Hertz. Used for sound, radio, electronics, and physics.
🔄 RPM
Revolutions Per Minute. Common for motors and rotating machinery. 1 RPM = 1/60 Hz. Easy to visualize rotation speed.
📐 Radians/Second
Angular frequency (ω). Used in physics and engineering. ω = 2πf. One complete rotation = 2π radians.
⏱️ Period
Period (T) = 1/frequency. Time for one complete cycle. 1 kHz = 1 ms period. Inverse relationship with frequency.
Frequently Asked Questions
How do I convert frequency units?
Use our calculator above: enter value, select source and target units. The formula
is Result = Value × Conversion Factor. All units convert through hertz as the base
unit.
How do I convert Hz to kHz?
Divide by 1,000. Formula: kHz = Hz ÷ 1000. Example: 5,000 Hz = 5
kHz. "Kilo" means thousand.
How do I convert kHz to MHz?
Divide by 1,000. Formula: MHz = kHz ÷ 1000. Example: 2,400 kHz =
2.4 MHz. Each prefix is 1000× the previous.
How do I convert Hz to RPM?
Multiply by 60. Formula: RPM = Hz × 60. Example: 50 Hz = 3,000
RPM. This is because there are 60 seconds in a minute.
How do I convert RPM to Hz?
Divide by 60. Formula: Hz = RPM ÷ 60. Example: 1,800 RPM = 30 Hz.
RPM = revolutions per minute, Hz = per second.
How do I convert Hz to radians per second?
Multiply by 2π (≈ 6.2832). Formula: ω = f × 2π. Example: 10 Hz =
62.83 rad/s. Angular frequency is useful in physics equations.
What is the relationship between frequency and period?
Period = 1 / Frequency. They are inverses. 100 Hz has period of
0.01 seconds (10 ms). Higher frequency = shorter period.
What is a hertz?
The SI unit of frequency. 1 Hz = 1 cycle per second. Named after
physicist Heinrich Hertz who proved existence of electromagnetic waves.
What is angular frequency?
ω = 2πf (radians per second). Measures rotation rate in radians
rather than cycles. One full cycle = 2π radians. Common in physics and engineering formulas.
What frequency is middle C?
~261.63 Hz (C4 in scientific pitch notation). Musical pitch is
directly related to frequency. Doubling frequency = one octave higher.
What is the frequency of AC power?
60 Hz (North America, parts of Asia) or 50 Hz
(Europe, most of world). This is how many times current alternates per second.
What frequency range can humans hear?
20 Hz to 20,000 Hz (20 kHz). Below 20 Hz = infrasound. Above 20
kHz = ultrasound. Range decreases with age.
What are radio frequency bands?
VLF: 3-30 kHz. AM radio: 530-1700 kHz. FM
radio: 88-108 MHz. WiFi: 2.4/5 GHz. 5G: up to ~100 GHz.
How do CPU frequencies work?
CPU clock speed in GHz = billions of cycles per second. 3.5 GHz =
3.5 billion operations potential per second. Higher ≈ faster (with caveats).
What is wavelength relationship to frequency?
Wavelength = Speed / Frequency (λ = c/f for light). Higher
frequency = shorter wavelength. For light: c = 3×10⁸ m/s. Radio waves have long wavelengths, X-rays very
short.
What is degrees per second?
Angular rotation rate in degrees. 360°/s = 1 revolution/second = 1
Hz = 60 RPM. Common in gyroscopes and navigation.
How accurate is this frequency converter?
Uses exact conversion factors. 2π for radian conversions uses high
precision. Results accurate for all practical purposes.