Hertz

A sine wave with varying frequency

The hertz (symbol: Hz) is a unit derived from time which measures frequency in the International System of Units (SI). Frequency is how often something happens. A frequency of 1 hertz means that something happens once a second. The note Middle C (the C in the middle of the piano) is 262 Hz. This means there are 262 vibrations every second, which is heard as the note Middle C, when that piano key is played.

Humans are able to hear sounds between 20-20 000 Hz[1]. Owls are able to hear sounds between 200-12000 Hz.[2]

The basic unit is 1/second. The unit is named after Heinrich Rudolf Hertz.

Multiple units

1000 hertz is 1 kilohertz. 1000 kilohertz is 1 megahertz, 1000 megahertz is 1 gigahertz: (see table)

Unit Equal to:
Kilohertz (KHz) 1000 Hz
Megahertz (MHz) 1000 KHz
Gigahertz (GHz) 1000 MHz
Terahertz (THz) 1000 GHz
Petahertz (PHz) 1000 THz
Exahertz (EHz) 1000 PHz
Zettahertz (ZHz) 1000 EHz
Yottahertz (YHz) 1000 ZHz
Other Languages
Afrikaans: Hertz
العربية: هرتز
asturianu: Herciu
azərbaycanca: Hers
বাংলা: হার্জ
Bân-lâm-gú: Hertz
беларуская (тарашкевіца)‎: Гэрц (адзінка вымярэньня)
български: Херц
བོད་ཡིག: ཧེར་ཚི།
bosanski: Herc
brezhoneg: Hertz
català: Hertz
čeština: Hertz
Cymraeg: Hertz
dansk: Hertz
eesti: Herts
Ελληνικά: Χερτζ
English: Hertz
español: Hercio
Esperanto: Herco
euskara: Hertz
فارسی: هرتز
français: Hertz
Gaeilge: Heirts
galego: Hertz
客家語/Hak-kâ-ngî: Het-tsṳ̂
한국어: 헤르츠
हिन्दी: हर्ट्ज़
hrvatski: Herc
Bahasa Indonesia: Hertz
interlingua: Hertz
íslenska: Herts
italiano: Hertz
עברית: הרץ
Basa Jawa: Hertz
қазақша: Герц
Kiswahili: Hezi
Latina: Hertz
latviešu: Hercs
Lëtzebuergesch: Hertz (Eenheet)
lietuvių: Hercas
magyar: Hertz
македонски: Херц
मराठी: हर्ट्‌झ
Bahasa Melayu: Hertz
монгол: Герц (нэгж)
Nederlands: Hertz (eenheid)
日本語: ヘルツ
Nordfriisk: Hertz
norsk: Hertz
norsk nynorsk: Hertz
occitan: Hertz
олык марий: Герц (шотлымаш)
پنجابی: ہرٹز
Piemontèis: Hertz
polski: Herc
português: Hertz
română: Hertz
русиньскый: Гертз
Scots: Hertz
shqip: Herci
sicilianu: Hertz
slovenčina: Hertz (jednotka)
slovenščina: Herc
српски / srpski: Херц
srpskohrvatski / српскохрватски: Herc
Basa Sunda: Hertz
suomi: Hertsi
svenska: Hertz
தமிழ்: ஏர்ட்சு
తెలుగు: హెర్ట్జ్
тоҷикӣ: Ҳертс
Türkçe: Hertz
українська: Герц
اردو: ہرٹز
Tiếng Việt: Hertz
Winaray: Hertz
粵語: 赫茲
中文: 赫兹