How Does Cremation Work? What Actually Happens

Detailed Explanation

Knowing what happens takes away a lot of the anxiety. Cremation is quiet, closely regulated, and handled with the same care as every other part of funeral work. The broad steps are the same almost everywhere; the paperwork, the officials involved, and the costs differ by country, and sometimes by state or province. See the Cremation hub for the site's other cremation guides.

Before the cremation: paperwork and safety checks

Cremation can't be undone, so most countries require checks before it can go ahead that are stricter than those for burial:

• Certification of the cause of death. A doctor records the cause of death on an official medical certificate, and the death is usually registered with the government before the funeral.
• An independent review. Someone other than the certifying doctor confirms there is no medical, legal or coronial reason to stop the cremation. Depending on the country this might be a medical referee attached to the crematorium, a medical examiner, a coroner, or a local registrar issuing a disposition permit.
• An application from the family. The executor or nearest relative signs a form applying for (or authorising) the cremation, often stating what should happen to the ashes.
• Coroner's clearance where needed. If the death was reported to a coroner or medical examiner, cremation waits until they release the body. See what happens when a death is reported to the coroner.

The funeral director normally handles the forms and passes them to the crematorium. Families arranging a funeral themselves deal with the crematorium directly.

Battery-powered implants such as pacemakers and implantable defibrillators can explode at cremation temperatures, so they have to be declared and are normally removed first. That is why the funeral home asks about implants. See what can and can't be placed in a coffin for the other items that can't go into a cremation, such as glass and some jewellery.

The cremation itself

The person is placed into a purpose-built cremator in their coffin or container, one at a time. Some countries require a coffin; others, such as the US, allow a simple cardboard or unfinished wood container. The chamber typically runs at around 800 to 1,000°C (about 1,400 to 1,800°F), and a cremation usually takes somewhere between one and a half and three hours, depending on the cremator, the coffin material and the person's build.

Afterwards the chamber cools and the remains are drawn out. These are bone fragments, not literal ash. Metal such as surgical implants and coffin fittings is separated out, usually to be recycled unless the family has asked for it back. The fragments are then processed into the fine, pale, sand-like material known as "ashes." An adult's ashes commonly weigh around 2 to 3.5 kilograms (roughly 4 to 8 pounds), and are placed in a labelled container.

After the cremation

Ashes are usually ready within a few days to a couple of weeks. Families can collect them, have the funeral director collect or deliver them, or ask the crematorium to scatter or inter them in its own grounds. Some countries set rules on how long a crematorium must hold uncollected ashes before it can scatter or bury them (see what happens to ashes that are never collected), but there is no rush to decide what happens to them in the long run. Many families take months, and that's normal. When you're ready, see what you can do with cremation ashes.

Where the service fits

Choosing cremation doesn't change the farewell itself. Families choose between:

• A full funeral service in a place of worship, a funeral home chapel or the crematorium, often ending with a committal as a curtain closes or the coffin is carried out.
• A short committal at the crematorium only.
• A direct cremation with a memorial gathering later, which is becoming more popular for its flexibility and lower cost. Direct cremation vs a traditional funeral compares the two in full.

A memorial doesn't have to be a single day, either. Some families create an online memorial so relatives who couldn't attend, or who live overseas, can share photos and stories.

If you're still weighing the basic choice, burial vs cremation walks through the decision. Families drawn to cremation but concerned about its energy use can read about water cremation (aquamation), a flameless alternative that is legal in some places but not others. For a pet rather than a person, see how pet cremation works: the process is similar, but the identification safeguards differ.

How it works where you are

The forms, officials, waiting periods and typical costs differ between countries. These pages cover the detail:

• Australia: how cremation works in Australia, covering state-based cremation permits, medical referees and independent doctors, and typical costs.
• United Kingdom: how cremation works in the UK, covering the medical examiner system, the Cremation 1 form, the green form, and the separate rules in Scotland.
• United States: how cremation works in the US, covering cremation authorisation, state waiting periods, medical examiner approval, and your rights under the FTC Funeral Rule.

Things to Consider

• Jewellery and keepsakes should be removed before cremation if the family wants to keep them. Tell the funeral director explicitly.
• The coffin matters less for cremation. A simple coffin or container is entirely appropriate; crematoria need only that it burns safely and cleanly. See choosing a coffin or casket.
• Ashes can be divided. They can be split between several keepsake urns so children or siblings each keep a share. Decide before collection so it's done once, respectfully.
• The cremation may not happen straight after the service. The committal at the service is symbolic. The cremation itself often follows later that day or within a day or two, in the crematorium's schedule.

Common Mistakes

• Believing myths about shared cremations or mixed-up ashes. Individual cremation and tracked identification are standard requirements, not courtesies.
• Buying an expensive coffin out of guilt. For cremation especially, the coffin's role is brief. If money is tight, spend on the farewell rather than the box.
• Collecting the ashes with no plan for the trip home. It sounds minor, but many people find this moment unexpectedly hard. Bring someone with you.
• Rushing the ashes decision. Scattering can't be undone. If the family isn't sure, wait. Ashes keep indefinitely, and clarity usually comes with time.