🎯 Frequency Converter
Car engine idle at 800 RPM = 13.33 Hz. 50 Hz power grid = 3000 RPM. A4 piano = 440 Hz. Different industries measure frequency differently.
Last updated — conversions use exact ISO unit definitions.
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How it works
Frequency conversions route through hertz (Hz = 1 cycle per second). Rotations per minute (RPM) convert to Hz by dividing by 60: 60 RPM = 1 Hz, 3,600 RPM = 60 Hz (typical car engine at cruising speed). To go the other way, multiply Hz by 60.
Kilohertz (kHz), megahertz (MHz), and gigahertz (GHz) are simply powers of 1,000: 1 GHz = 1,000 MHz = 1,000,000 kHz = 1,000,000,000 Hz. This tool also handles angular frequency in radians per second (rad/s): multiply Hz by 2π, so 60 Hz ≈ 376.99 rad/s.
The unit circle gives the relationship: 1 Hz = 2Ï€ rad/s = 60 RPM. You'll see all three in audio (Hz), mechanics (RPM), and signal processing (rad/s).
Real-world applications
Car engines: A typical sedan redlines at 6,500 RPM = 108 Hz. Formula 1 cars rev to 15,000 RPM = 250 Hz. Electric motors can spin 20,000 RPM = 333 Hz.
Music and audio: Standard tuning A = 440 Hz. Middle C = 261.63 Hz. Human hearing range is roughly 20 Hz to 20 kHz.
How frequency units relate
1 Hz = 1 cycle per second = 60 RPM = 2Ï€ radians/second. Period = 1/frequency. Audio Hz = sound vibration. 50 Hz EU, 60 Hz US power grids.
How accurate are these conversions?
All conversions use ISO 80000 standard unit definitions. For example, 1 inch = 2.54 centimeters exactly by international agreement.
Why can't I see all units on mobile?
The result table scrolls horizontally. The headline pair above shows the most commonly requested conversion.
Do you store my inputs?
No. All calculations happen in your browser. We collect zero personal data.
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