Frequency Converter — Hertz, MHz, GHz, RPM and More
Convert frequency units instantly — hertz to megahertz, GHz to MHz, RPM to Hz. Understand frequency in electronics, audio, and everyday devices.
Frequency measures how often something repeats per unit of time. It shows up in radio specifications, Wi-Fi standards, CPU speeds, audio equipment, motor speeds, and even your microwave oven. The units range from millihertz to terahertz, and knowing how to convert between them is more practically useful than you'd expect.
The CalcHub frequency converter handles all standard frequency units instantly.
Common Frequency Conversions
| From | To | Multiply by |
|---|---|---|
| 1 hertz (Hz) | kilohertz (kHz) | 0.001 |
| 1 kilohertz (kHz) | hertz (Hz) | 1,000 |
| 1 megahertz (MHz) | hertz (Hz) | 1,000,000 |
| 1 gigahertz (GHz) | megahertz (MHz) | 1,000 |
| 1 terahertz (THz) | gigahertz (GHz) | 1,000 |
| 1 RPM | hertz (Hz) | 0.01667 |
| 60 RPM | hertz (Hz) | 1 |
Where Frequency Matters
Wi-Fi and Wireless
Your router operates on specific frequency bands:
| Band | Frequency | Characteristics |
|---|---|---|
| Wi-Fi 2.4 GHz | 2,400–2,483.5 MHz | Better range, slower speeds, more congestion |
| Wi-Fi 5 GHz | 5,150–5,850 MHz | Shorter range, faster speeds, less congestion |
| Wi-Fi 6E / 6 GHz | 5,925–7,125 MHz | Shortest range, fastest speeds, newest standard |
| 5G mmWave | 24–100 GHz | Very short range, extremely fast, outdoor mainly |
Computer Processors
CPU clock speed is measured in GHz:
- A 3.5 GHz processor cycles 3,500,000,000 times per second
- Higher GHz doesn't always mean faster — architecture and core count matter
- "Boost clock" is the maximum frequency under load; "base clock" is the sustained speed
Audio
Human hearing ranges from about 20 Hz to 20,000 Hz (20 kHz):
| Frequency Range | Sound Type |
|---|---|
| 20–250 Hz | Bass (kick drums, bass guitar) |
| 250–2,000 Hz | Midrange (vocals, most instruments) |
| 2,000–6,000 Hz | Upper mid (speech clarity, presence) |
| 6,000–20,000 Hz | Treble (cymbals, air, brightness) |
Power Grid
- India runs on 50 Hz AC power (50 cycles per second)
- US and parts of Asia run on 60 Hz
- This affects clocks, motors, and some electronics when traveling between countries
- A device designed for 50 Hz may run 20% faster on a 60 Hz supply (or vice versa), which can damage motors
Motors and RPM
Motor speed is typically given in RPM (revolutions per minute):
- Ceiling fan: 300–400 RPM
- Car engine at cruising speed: 2,000–3,000 RPM
- Hard drive: 5,400 or 7,200 RPM
- Washing machine spin cycle: 800–1,400 RPM
To convert RPM to Hz: divide by 60. A 3,000 RPM motor rotates at 50 Hz — one rotation every 0.02 seconds.
How to Use the CalcHub Frequency Converter
- Open the Frequency Converter at CalcHub
- Enter your value (e.g., "2400")
- Select source unit (e.g., "MHz")
- Select target unit (e.g., "GHz")
- Instant result: 2.4 GHz
Why is India's power grid 50 Hz while the US uses 60 Hz?
Historical reasons — early European electrical standards chose 50 Hz (slightly less efficient for motors but worked well with their early generator designs), while the US standardized on 60 Hz. Neither is inherently better, but the difference matters for any frequency-sensitive equipment.
What does "5G" actually mean in frequency terms?
5G isn't a single frequency — it's a standard that operates across multiple bands. Low-band 5G uses 600–900 MHz (similar range to 4G), mid-band uses 2.5–4.7 GHz, and high-band (mmWave) uses 24–100 GHz. Higher frequencies deliver faster speeds but shorter range.
Can humans hear above 20 kHz?
Essentially no — hearing ability at the high end decreases with age. Most adults can't hear above 15–16 kHz. The 20 kHz upper limit is for young, healthy ears. This is why "ultrasonic" devices (above 20 kHz) are inaudible to humans but detectable by dogs and bats.
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