Convert between frequency units for radio, electronics, and science. Professional tool for RF engineering and electronic applications.
SI unit of frequency. 1 Hz = 1 cycle per second. Base unit for all frequency measurements.
1,000 Hz. Common in audio frequencies, AM radio, and low-frequency electronics.
1,000,000 Hz. Used in FM radio, TV broadcasts, and computer processors.
1,000,000,000 Hz. Microwave frequencies, WiFi, Bluetooth, and modern CPUs.
1,000,000,000,000 Hz. Infrared radiation, molecular vibrations, and advanced imaging.
Revolutions per minute. Mechanical rotation frequency for motors, engines, and rotating machinery.
| Unit | Hertz (Hz) | Period (seconds) | Wavelength (c=3×10⁸ m/s) | Common Application |
|---|---|---|---|---|
| 1 Hz | 1 | 1 s | 3×10⁸ m | Power line frequency |
| 1 kHz | 1,000 | 1 ms | 300 km | Audio frequencies |
| 1 MHz | 10⁶ | 1 μs | 300 m | AM/FM radio |
| 1 GHz | 10⁹ | 1 ns | 30 cm | Microwave, WiFi |
| 1 THz | 10¹² | 1 ps | 300 μm | Infrared radiation |
| 1 PHz | 10¹⁵ | 1 fs | 300 nm | Visible light |
Fundamental relationship between frequency and period. T is the time for one complete cycle.
Relates frequency to wavelength through wave speed. For electromagnetic waves, c = 3×10⁸ m/s.
Angular frequency in radians per second. Used in oscillatory motion and AC circuits.
Frequency change due to relative motion between source and observer.
Natural frequency of LC oscillator circuit. L is inductance, C is capacitance.
Frequency of amplitude modulation when two close frequencies interfere.
| Band | Frequency Range | Wavelength Range | Applications |
|---|---|---|---|
| ELF (Extremely Low) | 3-30 Hz | 10⁴-10⁵ km | Power lines, submarine communication |
| VLF (Very Low) | 3-30 kHz | 10-100 km | Navigation, time signals |
| LF (Low) | 30-300 kHz | 1-10 km | AM radio, beacons |
| MF (Medium) | 300 kHz-3 MHz | 100-1000 m | AM broadcasting |
| HF (High) | 3-30 MHz | 10-100 m | Shortwave, amateur radio |
| VHF (Very High) | 30-300 MHz | 1-10 m | FM radio, TV, aircraft |
| UHF (Ultra High) | 300 MHz-3 GHz | 10 cm-1 m | TV, cell phones, GPS |
| SHF (Super High) | 3-30 GHz | 1-10 cm | WiFi, Bluetooth, radar |
| EHF (Extremely High) | 30-300 GHz | 1-10 mm | Millimeter wave, 5G |
Delta: 0.5-4 Hz (deep sleep)
Theta: 4-8 Hz (meditation)
Alpha: 8-12 Hz (relaxed)
Beta: 12-30 Hz (active thinking)
Gamma: 30-100 Hz (high cognition)
Heart rate: 1-3 Hz (60-180 BPM)
Breathing: 0.2-0.5 Hz (12-30/min)
Blinking: 0.3 Hz (20/min)
Walking: 1-2 Hz
Circadian: 1.16×10⁻⁵ Hz (24 hours)
Schumann resonance: 7.83 Hz
Earth rotation: 1.16×10⁻⁵ Hz
GPS satellites: 1.57 GHz
Pulsar PSR B1919+21: 1.337 Hz
Hydrogen line: 1.42 GHz