They vary in weight greatly - from 10kg, up to 10 tonnes (which is 10000kg).
But since I presume you're asking for the common dolphin -
a common dolphin can weigh up to 75 kg.
If you weigh 56 pounds, you weigh about 25.5 kilograms.
190 pounds is 86.2 kilograms.
224 pounds = 101.604691 kilograms
2
215 pounds equals about 97.5 kilograms.
two kilograms
big
On Earth's moon, it would weigh 7.4 kilograms.
0.8 kilograms for men. 0.6 kilograms for women
140lbs is 63.5 kilograms.
not much
About 350 pounds.