Frequency Converter

Frequency describes how many times a periodic event repeats per unit time. The SI unit is the hertz (Hz). From smallest to largest:

Microscopic frequency units

• Microhertz (μHz): 1 μHz = 0.000001 Hz
  Use: Earth rotation variations, astronomy, seismic studies
• Millihertz (mHz): 1 mHz = 0.001 Hz
  Use: Ocean waves, low-frequency seismic analysis, ULF vibration monitoring

Basic frequency units

• Hertz (Hz): base unit, one cycle per second
  Use: mains frequency (50/60 Hz), low audio, mechanical vibration
• Kilohertz (kHz): 1 kHz = 1,000 Hz
  Use: audio signals, ultrasound, AM/MW radio
• Megahertz (MHz): 1 MHz = 1,000 kHz
  Use: FM (88–108 MHz), TV signals, mobile comms

High frequency units

• Gigahertz (GHz): 1 GHz = 1,000 MHz
  Use: 5G (2–6 GHz), Wi‑Fi (2.4/5 GHz), satellite links, microwave ovens (2.45 GHz)
• Terahertz (THz): 1 THz = 1,000 GHz
  Use: biomedical imaging, security scanning, THz spectroscopy

Ultra-high frequency units

• Petahertz (PHz): 1 PHz = 1,000 THz
  Use: visible light range, optical communications, quantum physics
• Exahertz (EHz): 1 EHz = 1,000 PHz
  Use: X‑rays, gamma rays, high‑energy physics

Usage notes

• Results use scientific notation for precision
• Input supports scientific notation, e.g., 1.2e6
• Common references:

  Power system frequencies

  • • Mains: 50 Hz (China/EU) / 60 Hz (US/JP)
  • • VFD output: 0.1–400 Hz
  • • Induction heating: 1 kHz–1 MHz

  Acoustics

  • • Infrasound: <20 Hz
  • • Human hearing: 20 Hz–20 kHz
  • • Ultrasound: >20 kHz
  • • Medical ultrasound: 1–15 MHz

  Wireless bands

  • • AM: 526.5–1606.5 kHz
  • • FM: 88–108 MHz
  • • Wi‑Fi: 2.4/5/6 GHz
  • • GPS L1: 1.57542 GHz

  Mobile communications

  • • 2G GSM: 900/1800 MHz
  • • 4G LTE: 700 MHz–2.6 GHz
  • • 5G Sub‑6: 2.5–3.7 GHz
  • • 5G mmWave: 24–52 GHz

  Electromagnetic spectrum

  • • Radio: 3 kHz–300 GHz
  • • Infrared: 300 GHz–430 THz
  • • Visible: 430–750 THz
  • • X‑ray: 30 PHz–30 EHz

  Computer processors

  • • Classic CPUs: 100 MHz–1 GHz
  • • Modern CPUs: 1–5 GHz
  • • DDR4 memory: 1.6–3.2 GHz
  • • GPU cores: 1–2 GHz

Note: Frequency conversion is widely used in wireless communications, electronics, and physics. Choose appropriate units for clarity.