There are 4 tonnes in 4000kg. One ton = 1000kg. One kg = 1000g. One g = 1000mg . . . . . . . . . .
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7000 kilograms = 7 tonnes
5.0 tonnes
2550kg = 2.5 UK tonnes or 2.8 US tonnes
If you mean larger units, for a thousand tonnes you might use Gigagrams, equivalent to kilotons; etc. However, usually this is simply called "a million kilograms" or "a thousand tonnes".
one tonnes= 1000kg therefore 40 tonnes is 40x1000=40'000kg