Frequency & RPM Converter
Frequency & RPM Converter: convert between 10 frequency units, for example 1 rpm = 0.01666666667 Hz.
| Unit | Value |
|---|---|
| revolution per minute to hertz | 0.01666666667 Hz |
| revolution per minute to kilohertz | 0.00001666666667 kHz |
| revolution per minute to megahertz | 1.666666667 × 10⁻⁸ MHz |
| revolution per minute to gigahertz | 1.666666667 × 10⁻¹¹ GHz |
| revolution per minute to terahertz | 1.666666667 × 10⁻¹⁴ THz |
| revolution per minute (rpm) | 1 rpm |
| revolution per minute to revolution per second | 0.01666666667 rps |
| revolution per minute to radian per second | 0.1047197551 rad/s |
| revolution per minute to degree per second | 6 °/s |
| revolution per minute to beat per minute | 1 bpm |
Convert frequency and rotational speed between Hz, kHz, MHz, GHz, rpm, revolutions per second, rad/s, degrees per second and bpm. 60 rpm = 1 Hz and 1 Hz = 2π rad/s exactly.
Frequency and angular velocity
A shaft turning once per second has a frequency of 1 Hz (1 rev/s, 60 rpm) and an angular velocity ω = 2π rad/s. Physics and power formulas such as P = Tω and v = ωr need rad/s; motor nameplates and tachometers give rpm.
Motor speed from supply frequency
An AC induction motor’s synchronous speed is 120 × f ÷ poles in rpm: 1500 rpm for a 4-pole motor on 50 Hz, 1800 rpm on 60 Hz. The running speed is a few percent lower (slip), e.g. 1450 rpm.
Frequency unit definitions
- hertz (Hz)
- The hertz (Hz) is the SI unit of frequency: one cycle, oscillation or revolution per second. Mains electricity runs at 50 Hz or 60 Hz.
- megahertz (MHz)
- A megahertz is one million hertz. FM radio uses 88–108 MHz, microcontrollers run at 8–200 MHz and RAM speeds are quoted in MHz (strictly MT/s).
- gigahertz (GHz)
- A gigahertz is 10⁹ Hz. Processor clocks run at 2–6 GHz, Wi-Fi at 2.4, 5 and 6 GHz, and 5G and radar up to tens of GHz.
- revolution per minute (rpm)
- Revolutions per minute (rpm) count full turns of a rotating shaft each minute. Dividing by 60 gives revolutions per second, numerically equal to hertz.
- kilohertz (kHz)
- A kilohertz is 1000 Hz. Human hearing reaches about 20 kHz, audio is sampled at 44.1 or 48 kHz, and AM radio broadcasts at 531–1602 kHz.
- radian per second (rad/s)
- The radian per second is the SI unit of angular velocity: a full turn is 2π radians, so 1 Hz of rotation equals 2π rad/s. Physics formulas such as v = ωr and P = Tω use rad/s.
Show 4 more units
- revolution per second (rps)
- Revolutions per second count full turns each second; one revolution per second is a rotational frequency of 1 Hz.
- degree per second (°/s)
- Degrees per second measure turning rate. A clock’s second hand turns at 6 °/s; gyroscope sensors are rated in °/s (dps).
- beat per minute (bpm)
- Beats per minute count events per minute: heartbeats for pulse rate and beats for musical tempo. 60 bpm is exactly 1 Hz.
- terahertz (THz)
- A terahertz is 10¹² Hz, between microwaves and infrared. Visible light spans about 400–750 THz and fibre-optic lasers near 1550 nm run at 193.4 THz.
Popular frequency conversions
- hertz to kilohertz
- hertz to revolution per minute
- hertz to radian per second
- kilohertz to hertz
- megahertz to gigahertz
- gigahertz to megahertz
- revolution per minute to hertz
- revolution per minute to radian per second
- radian per second to hertz
- radian per second to revolution per minute
Show all 90 frequency conversions
From hertz
From kilohertz
From megahertz
From gigahertz
From terahertz
From revolutions per minute
- revolution per minute to hertz
- revolution per minute to kilohertz
- revolution per minute to megahertz
- revolution per minute to gigahertz
- revolution per minute to terahertz
- revolution per minute to revolution per second
- revolution per minute to radian per second
- revolution per minute to degree per second
- revolution per minute to beat per minute
From revolutions per second
- revolution per second to hertz
- revolution per second to kilohertz
- revolution per second to megahertz
- revolution per second to gigahertz
- revolution per second to terahertz
- revolution per second to revolution per minute
- revolution per second to radian per second
- revolution per second to degree per second
- revolution per second to beat per minute
From radians per second
- radian per second to hertz
- radian per second to kilohertz
- radian per second to megahertz
- radian per second to gigahertz
- radian per second to terahertz
- radian per second to revolution per minute
- radian per second to revolution per second
- radian per second to degree per second
- radian per second to beat per minute
From degrees per second
- degree per second to hertz
- degree per second to kilohertz
- degree per second to megahertz
- degree per second to gigahertz
- degree per second to terahertz
- degree per second to revolution per minute
- degree per second to revolution per second
- degree per second to radian per second
- degree per second to beat per minute
From beats per minute
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Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures.
Last reviewed: .