Frequency Converter — Hz, kHz, MHz, 50 vs 60 Hz

Frequency counts how many cycles occur per second. Electronics use hertz and its prefixes, radio bands quote megahertz and gigahertz, motors list RPM on nameplates, and mains power is 50 Hz or 60 Hz depending on region. This converter scales between Hz, kHz, MHz, GHz, and revolutions per minute from a single input.

Pick From and To units, enter a value, and read the result instantly. All math runs in your browser — nothing is uploaded. This is unit scaling between labels, not hardware that changes AC mains frequency.

The SI unit of frequency is the hertz (Hz): one cycle per second. Larger units use standard prefixes:

1 kHz = 1,000 Hz · 1 MHz = 1,000 kHz · 1 GHz = 1,000 MHz

FM radio sits around 88–108 MHz. Wi‑Fi uses the 2.4 GHz band. Human hearing spans roughly 20 Hz to 20 kHz. Ultrasound and medical imaging work in MHz. In RF engineering, a "frequency downconverter" mixes a signal to a lower carrier — that is different from dividing 1 GHz by 1,000 to get megahertz.

Most of Europe, Asia, and Africa use 50 Hz grid power. North America and parts of Japan use 60 Hz. As unit values, 60 Hz is 20% higher than 50 Hz. A two-pole synchronous motor runs 3,000 RPM at 50 Hz and 3,600 RPM at 60 Hz.

Moving appliances between regions requires hardware that transforms AC mains — a solid-state or rotary frequency converter that also handles voltage (110 V vs 220 V) and phase. Running a 60 Hz motor on 50 Hz without that equipment can overheat or underperform. This page compares the numeric difference and RPM equivalents; it does not replace industrial power conversion gear.

Aircraft electrical systems often use 400 Hz instead of 50/60 Hz — lighter transformers at the cost of different equipment standards. As unit math: 400 Hz is 6.67 times faster than 60 Hz mains. Enter 400 Hz to read 0.4 MHz or about 24,000 RPM for a two-pole synchronous machine.

Ground support equipment that converts 400 Hz to 60 Hz for hangar power is industrial hardware, not an online calculator. Three-phase frequency changes likewise need motor drives or static converters, not simple multiplication.

Revolutions per minute (RPM) describe rotational speed. For a machine where each revolution equals one electrical cycle (two-pole synchronous case):

Hz = RPM ÷ 60  ·  RPM = Hz × 60

Examples: 3,600 RPM = 60 Hz · 3,000 RPM = 50 Hz · 1,800 RPM = 30 Hz. Real motors slip slightly below synchronous speed under load — use nameplate RPM as the practical reference.

Period (T) is the time for one complete cycle. It is the inverse of frequency:

T (seconds) = 1 / f (Hz)

Examples: 60 Hz → 16.67 ms period · 50 Hz → 20 ms · 1 kHz → 1 ms · 440 Hz (concert A) → about 2.27 ms. After converting to Hz in this tool, divide 1 by the result for period in seconds.

Variable-frequency drives (VFDs), static frequency changers, and single-phase-to-three-phase motor drives are physical equipment — not this software. Product searches for Siemens or Danfoss drives need manufacturer datasheets.

For pure Hz scaling, 50 Hz vs 60 Hz comparison, RPM↔Hz, and period calculations (T = 1/f), this page is the right tool. Audio pitch, radio channels, and oscilloscope timing all start from the same hertz definition.