Weights listed are the upper limit. All are in KGs.
Heavyweight - 200
Cruiserweight - 175
Light Heavyweight - 168
Super Middleweight - 160
Middleweight - 154
Super welterweight - 147
Welterweight - 140
Super lightweight - 135
lightweight - 130
Super featherweight - 126
Featherweight - 122
Super bantamweight - 118
Bantamweight - 115
Super flyweight - 112
Flyweight - 108
84 kg
Most professional boxing organizations recognize 105 lbs. (or less) as the lightest weight class. This goes by different names, such as Minimumweight, Strawweight, and Mini Flyweight. The Olympics have a different set of standards and weight classes. The lightest class in the Olympics is Light Flyweight (106 lbs or less).
On or near the surface of the Earth, 1 newton is the weight of 0.102 kg. In other places, 1 newton is the weight of a different amount of mass.
Kg is weight Liter is volume. It takes one liter of water to get one kilo of weight. Other substances will be different.
The weight of a body depends upon the force of gravity acting upon that body. A 50 kg body will have a weight that is 50 times that of a 1 kg mass. The weight of the body will be different on earth, on the moon and in deep space (zero).
The weight of a 1-kg brick is 9.81 Newtons, which is the force exerted on the brick due to gravity.
0.6 kg of mass has different weight in different places. On earth, 0.6 kg of mass weighs 5.88 newtons (1.323 pounds).
On Earth, 2 kg weighs 4.409 pounds. In other places, 2 kg has a different weight.
On Earth, 1.9 kg of mass weighs 67 ounces. (rounded) In other places, its weight is different.
"Pound" is a unit of force. "Kg" is a unit of mass. They don't convert directly. On Earth, 70 pounds is the weight of 31.751 kg of mass. (rounded) On the moon, 70 pounds is the weight of 191.858 kg of mass. (rounded) In other places, 70 pounds is the weight of different amounts of mass.
Weight is a force, i.e. mass x acceleration In earth's gravitational field the acceleration is 9.80665 m/s² so 88.6 kg would weigh 868.9 N. Which is equivalent to 195.329563725206 lb(force) Of course, where gravity is different, the weight of that mass would also be different.
Total weight increased = (8 x 2.5) kg = 20 kg. Weight of new person = (65 + 20) kg = 85 kg.