Instantly convert between Hz, kHz, MHz, GHz, THz, RPM, and rad/s
Frequency measures the number of occurrences of a repeating event per unit time. The hertz (Hz) is the SI unit of frequency, named after physicist Heinrich Hertz. One hertz equals one cycle per second. Frequency conversions are essential in electronics, telecommunications, physics, and engineering.
The kilohertz (kHz), megahertz (MHz), and gigahertz (GHz) are commonly used to describe radio frequencies, audio signals, and computer processor speeds. 1 MHz equals 1,000,000 Hz and 1 GHz equals 1,000,000,000 Hz. These units follow the International System of Units (SI) metric prefixes.
RPM (revolutions per minute) measures rotational speed and is commonly used for engines, motors, and hard drives. To convert RPM to Hz, divide by 60 (since there are 60 seconds per minute). 1 RPM = 1/60 Hz ≈ 0.01667 Hz.
Radians per second (rad/s) is the SI unit of angular frequency. One complete revolution equals 2π radians, so 1 Hz = 2π rad/s ≈ 6.283185 rad/s. This unit is widely used in physics and engineering for rotational motion calculations.
| Unit | To Hz | From Hz |
|---|---|---|
| Hz | 1 | 1 |
| kHz | × 1,000 | ÷ 1,000 |
| MHz | × 1,000,000 | ÷ 1,000,000 |
| GHz | × 1,000,000,000 | ÷ 1,000,000,000 |
| THz | × 1,000,000,000,000 | ÷ 1,000,000,000,000 |
| rpm | ÷ 60 | × 60 |
| rad/s | ÷ 2π | × 2π |
To convert MHz to GHz, divide the MHz value by 1000. For example, 1000 MHz equals 1 GHz. 1 GHz = 1,000 MHz = 1,000,000 kHz = 1,000,000,000 Hz.
1 RPM (revolution per minute) equals 1/60 Hz or approximately 0.01667 Hz. This is because there are 60 seconds in a minute, so each revolution per minute is one cycle per 60 seconds.
To convert rad/s to Hz, divide the rad/s value by 2π (approximately 6.283185). For example, 1 rad/s ≈ 0.159155 Hz. This is because one complete cycle is 2π radians.
Hz (hertz) measures frequency in cycles per second, while rad/s (radians per second) measures angular frequency. 1 Hz = 2π rad/s ≈ 6.283185 rad/s. Both measure rotational speed but use different units.
1 THz (terahertz) equals 1,000,000,000,000 Hz (1 trillion hertz). THz is commonly used for terahertz imaging, spectroscopy, and wireless communications. 1 THz = 10^12 Hz.
RPM and Hz both measure frequency but use different time bases. RPM measures revolutions per minute while Hz measures cycles per second. To convert between them, multiply or divide by 60 (the number of seconds per minute).