An electric motor spins at 1,500 RPM. What's that in hertz?

1,500 ÷ 60 = 25 Hz. It completes 25 full rotations per second.

Why is 60 Hz (US power frequency) related to 3,600 RPM?

AC power generators run at 3,600 RPM to produce 60 Hz. European standards: 50 Hz = 3,000 RPM generators.

My fan is rated 1,200 RPM. How many times per second does it spin?

1,200 ÷ 60 = 20 Hz = 20 times per second. A moderate-speed ceiling fan.

Is there a quick mental conversion from RPM to Hz?

Divide by 60. Or think: 60 RPM = 1 Hz, 120 RPM = 2 Hz, 1,200 RPM = 20 Hz. Once you have Hz, you can convert to higher frequency units with [Hz to kHz](/frequency/hz-to-khz/).

RPM to Hertz (Hz) Converter

Enter a value to instantly convert between frequency units.

From

Precision4 dp

1 RPM = 0.0167 Hertz

Key Formulas

Hertz → Kilohertz

kHz = Hz × 0.001

Kilohertz → Hertz

Hz = kHz × 1000

Megahertz → Gigahertz

GHz = MHz × 0.001

Gigahertz → Megahertz

MHz = GHz × 1000

Formula

Hz = RPM ÷ 60

RPM (revolutions per minute) measures rotation speed of engines, motors, fans. Hertz measures frequency (cycles per second). One rotation = one cycle. 60 RPM = 1 Hz (one cycle per second). This conversion is useful when comparing mechanical rotation to electrical frequency.

Source: ISO 80000-3:2019 (Space and time)

Frequently Asked Questions

Real-World Examples

One hertz. 60 RPM = 1 Hz. Baseline for frequency measurement.

60 rpm = 1 Hz

60 hertz (AC power). 3,600 RPM = 60 Hz. Standard US electrical frequency.

3600 rpm = 60 Hz

Typical motor speed. 2,000 RPM ≈ 33.3 Hz. Industrial motors often run in this range.

2000 rpm = 33.33 Hz

High-speed motor. 8,000 RPM ≈ 133 Hz. Power tools, dental drills.

8000 rpm = 133.33 Hz

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RPM to Hertz (Hz) Converter

Key Formulas

Formula

Frequently Asked Questions

Real-World Examples

Related Converters