Tonne, metric tonne =

1000 kilograms.

KILOGRAM

F1for 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 Δv_Cs, 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.