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The SI unit of frequency is the hertz (abbreviated Hz), named after the German physicist Heinrich Hertz. A previous name for this unit was cycles per second (cps). The SI unit for period is the second. A traditional unit of measure used with rotating mechanical devices is revolutions per minute, abbreviated r/min or rpm. 60 rpm equals one hertz.

- 1 Per Second (1/s) ⇛
- Attohertz (aHz) ⇛
- Centihertz (cHz) ⇛
- Cycle Per Second (cps) ⇛
- Decahertz (daHz) ⇛
- Decihertz (dHz) ⇛
- Degree Per Day (°/day) ⇛
- Degree Per Hour (°/hr) ⇛
- Degree Per Minute (°/min) ⇛
- Degree Per Second (°/sec) ⇛
- Exahertz (EHz) ⇛
- Femtohertz (fHz) ⇛
- Frames Per Second (FPS) ⇛
- Fresnels (fresnel) ⇛
- Gigahertz (GHz) ⇛
- Hectohertz (hHz) ⇛
- Hertz (Hz) ⇛
- Kilohertz (kHz) ⇛
- Megahertz (MHz) ⇛
- Microhertz (μHz) ⇛
- Millihertz (mHz) ⇛
- Nanohertz (nHz) ⇛
- Petahertz (PHz) ⇛
- Picohertz (pHz) ⇛
- Radian Per Day (rad/d) ⇛
- Radian Per Hour (rad/h) ⇛
- Radian Per Minute (rad/min) ⇛
- Radian Per Second (rad/s) ⇛
- Revolutions Per Day (rpd) ⇛
- Revolutions Per Hour (rph) ⇛
- Revolutions Per Minute (rpm) ⇛
- Revolutions Per Second (rps) ⇛
- Terahertz (THz) ⇛
- Yoctohertz (yHz) ⇛
- Yottahertz (YHz) ⇛
- Zeptohertz (zHz) ⇛
- Zettahertz (ZHz) ⇛

- Kilohertz -> Zettahertz
- Zettahertz -> Kilohertz
- Terahertz -> Decihertz
- Decihertz -> Terahertz
- Radian Per Second -> Revolutions Per Minute
- Revolutions Per Minute -> Radian Per Second
- Hertz -> Radian Per Day
- Radian Per Day -> Hertz
- Exahertz -> Femtohertz
- Femtohertz -> Exahertz
- Yottahertz -> Cycle Per Second
- Cycle Per Second -> Yottahertz
- Hectohertz -> Yoctohertz
- Yoctohertz -> Hectohertz
- Decahertz -> Petahertz
- Petahertz -> Decahertz
- Nanohertz -> Degree Per Second
- Degree Per Second -> Nanohertz
- Revolutions Per Day -> Attohertz
- Attohertz -> Revolutions Per Day