How many kilograms of ashes are there after death?

The ashes are about 1 kg 8-7 kg 2. The average weight of adult ashes is about 4 kg 8. The average weight of boys is 5 Jin 3, and that of girls is 3 Jin 6.

Burning in a cremator at 760~ 1 150℃ for two hours, most tissues (especially organs) and other soft tissues of human body will evaporate and oxidize due to the heat and gas released by the exhaust system.

After cremation, all the remains are dry bone fragments (mostly calcium phosphate and secondary minerals). These substances are about 3.5% of the original weight, so after cremation, the weight of the ashes is 3.5% of the body weight. Because the weight of dry bone fragments is very close to that of bones, it will vary from person to person.

According to the chemical composition of the human body, inorganic salts are part of the human body, accounting for about 5% of the body weight. At high temperature, water and organic matter in human body decompose and volatilize, so the residual amount of inorganic matter should account for about 50% of human tissue. Often due to insufficient dry burning, bones are not easy to burn out. And objective combustion makes inorganic substances form oxides, which also increases the weight.

Therefore, the final ashes should be above 15 kg, and cremation firefighters generally only sweep out part of the ashes and put them in the urn, and will not put all the residues in it.