Fahrenheitova termometarska ljestvica je ljestvica za mjerenje temperature, koju je 1724. osmislio njemački fizičar Gabriel Fahrenheit. Stupnjevi izmjereni na Fahrenheitovoj termometarskoj skali obilježeni su znakom °F. Fahrenheitovu ljestvicu su upotrebljavali isključivo Englezi cijelog svijeta, sve do 70-ih godina 20. stoljeća, a sada su mnoge engleske zemlje prihvatile (osim SAD-a i Jamajke) korištenje Celzijeve termometarske ljestvice. Normalna temperatura čovjekova tijela je 98,6 °F, ali prije se smatrala normalna temperatura čovjeka 96 °F. Ovu termometarsku skalu usavršio je Gabriel Fahrenheit, napunivši je živom, koja je zamijenila alkohol. Led se topi na 32 °F, a voda vrije na 212 °F.
Iz Fahrenheitove termometarske ljestvice lako se stupnjevi Fahrenheita preračunavaju u Celzijeve stupnjeve:
T(°C) = (T(°F) - 32 °F)/1,8
Obratna formula je
T(°F) = 1,8 T(°C) + 32
Tablica pretvorbe između jedinica za temperaturu
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