Weights and Measures Act 1985

Metric units U.K.

Tonne, metric tonne =	1000 kilograms.
KILOGRAM	[F1 for which the symbol “kg” is used, is the SI unit of mass, defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 x 10-34 when expressed in the unit J s, which is equal to kg m2 s-1, where the second is defined by taking the fixed numerical value of the caesium frequency ΔvCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.]
Hectogram =	1/10 kilogram.
Gram =	1/1000 kilogram.
Carat (metric) =	1/5 gram.
Milligram =	1/1000 gram.

Textual Amendments

F1 Words in Sch. 1 Pt. 5 substituted (13.6.2020) by The Weights and Measures Act 1985 (Definitions of Metre and Kilogram) (Amendment) Order 2020 (S.I. 2020/586), arts. 1(b), 2(3)