How Hot Is a Cremation? Temperature and the Heat Process

Flame cremation usually takes place between 1,400 and 1,600 degrees Fahrenheit, according to the Cremation Association of North America (CANA). That is about 760 to 870 degrees Celsius. CANA adds that laws on required temperatures vary by state. The heat reduces the body and the container to gases and leaves only bone fragments, which are then processed into the remains returned to the family.

How hot is a cremation?

CANA says the cremation process usually occurs between 1,400 and 1,600 degrees Fahrenheit. The cremator itself is lined on the top, sides and bottom with heavy refractory tile or brick and insulation.

Different countries and different equipment run at different temperatures. A 2025 study from Japan, for example, heated devices at 1,100 degrees Celsius, which is about 2,010 degrees Fahrenheit, to represent a standard adult cremation, and at 800 degrees Celsius, about 1,470 degrees Fahrenheit, for smaller bodies. The US figure to use is CANA's range, and your provider can tell you about its own procedures.

What does the heat actually do?

CANA describes cremation as essentially the conversion of a solid to a gas. The body contains between 65 and 85 percent water by weight, and it is heated to a temperature high enough for combustion. The process happens in two stages:

1. Primary combustion takes place in the main chamber. Tissue, organs, body fat and the container burn off as gases and move to a second chamber. The bone fragments stay in the main chamber.
2. Secondary combustion takes place in the second chamber, where the gases continue to burn. Inorganic particles, usually from the container, settle on its floor. The gases that result, such as carbon dioxide and water, leave through a stack in the roof of the crematory building.

CANA says the process can take anywhere from 30 minutes, as for a stillborn child, to over two hours, depending on body size and the heat already stored in the chamber. For the full timeline from death to ashes, see how long cremation takes.

What is left after the heat?

Bone. CANA says the fragments in the main chamber are mostly calcium phosphates with some minor minerals. They are swept into a cooling tray, allowed to cool and taken to a processor, which uses blades to reduce them to pieces less than one-eighth inch. The remains are generally white to gray, and the average weight for an adult is between four and six pounds.

CANA also notes that the remains can contain pieces of metal, from surgical implants such as hip replacements, dental fillings, casket handles or jewelry that was not removed. That metal is separated before processing and is typically recycled. See how much ash to expect, teeth in cremation and gold teeth after cremation.

Why does the heat matter for what goes in the container?

The heat is why providers ask what is in and on the body. CANA says metal caskets cannot be cremated, and that not everything is combustible, so a wrong item left in the container can damage the equipment or the operator. Jewelry and watches are normally removed and returned to the family if you arrange it in advance.

Pacemakers and other implanted devices are the main safety concern. In the 2025 Journal of Arrhythmia experiment, all 13 devices exploded, in an average of 4.3 to 5.4 minutes depending on the temperature, though the study saw no structural damage to the chambers. It says removal or deactivation is generally recommended, not legally required, in the US and Europe. Some states have their own rules. Texas bars a crematory from knowingly cremating remains with a pacemaker, and holds an authorizing agent or funeral director who fails to remove one liable for resulting damage.

See pacemakers and cremation, cremation with jewelry and what the body can wear for cremation.

How hot is water cremation?

Much cooler. CANA says alkaline hydrolysis, often called water cremation or aquamation, may heat the contents to 199 to 302 degrees Fahrenheit, with pressure or agitation depending on the equipment, and takes three to sixteen hours. It is a water-based process, not a flame, and it leaves bone fragments that CANA says appear pure white. It is legal in only some states. Compare the methods in aquamation vs traditional cremation and how aquamation works.

Is more than one person cremated at a time?

Not without written permission from every authorizing agent, where the law allows it at all. Texas, for example, bars simultaneous cremation of more than one person in the same chamber unless the authorizing agent for each person signs a written authorization. CANA describes eight identification checkpoints, from removal from the place of death to return of the remains, and a stainless steel disc that stays with the remains throughout. Our guide on what happens during cremation walks through each step, and can cremation go wrong covers the safeguards.

What to do next

1. Ask the provider about its own procedures, including how it tracks identification and whether you can witness the cremation. See being present at a cremation.
2. Tell the funeral home about any pacemaker or implant.
3. Ask what personal items can go in the container and what will be returned to you.