Frequency Reference Sheet

Metric (SI)

• 1 hertz (Hz) = 1 cycle/s
• 1 kilohertz (kHz) = 1,000 Hz
• 1 megahertz (MHz) = 1,000,000 Hz
• 1 gigahertz (GHz) = 1,000,000,000 Hz
• 1 terahertz (THz) = 10¹² Hz

Related non-SI units

• 1 revolution per second (rps) = 1 Hz
• 1 revolution per minute (rpm) = 1/60 Hz
• 1 rad/s = Hz × 2π (1 rad/s ≈ 0.1591549431 Hz)

Non-SI → SI

• 3 rps = 3 Hz
• 1,800 rpm = 30 Hz
• 10 rad/s ≈ 1.591549431 Hz

SI → Non-SI

• 60 Hz = 1,800 rpm
• 50 Hz ≈ 314.159 rad/s
• 2 Hz = 2 rps = 120 rpm

Quick benchmarks

• Mains electricity: 50/60 Hz
• Concert A (A4): 440 Hz
• Human hearing: ~20 Hz–20 kHz
• FM broadcast: 88–108 MHz
• Wi-Fi: 2.4/5/6 GHz
• Modern CPUs: ~1–5 GHz

Table: factors to hertz (Hz)