How long does it take for a body to decompose? (2024)

How long does it take for a body to decompose? (1)

The moment a person dies, their body begins to break down as cells wither and bacteria invade. But how long does it take for a body to fully decompose?

Although the process of decomposition starts within minutes of death, there are a number of variables, including the ambient temperature, soil acidity and coffin materials, which can affect how long it takes a body to skeletonize. However, on average, a body buried within a typical coffin usually starts to break down within a year, but takes up to a decade to fully decompose, leaving only the skeleton, Daniel Wescott, director of the Forensic Anthropology Center at Texas State University, told Live Science.

A body buried without a coffin, which doesn't have protection from insects and other elements, typically skeletonizes within five years, according to Nicholas Passalacqua, an associate professor at the Forensic Osteology Research Station at Western Carolina University.

Decomposition itself is fairly straightforward. Once death occurs and oxygenated blood stops flowing, cells die; in a process called autolysis, cells release enzymes (especially those from the lysosomes, which contain digestive enzymes), which break down the cells themselves, as well as carbohydrates and proteins, according to "The Cell: A Molecular Approach," (Sinauer Associates, 2000).

Putrefaction, or the decomposition of organic matter without oxygen by bacteria, fungi or other organisms, can turn parts of a body's skin green about 18 hours after death, according to the book "Evaluation of Postmortem Changes" (StatPearls Publishing, 2022). This occurs simultaneously as bacteria in the abdomen rapidly multiply, creating gases that cause the body to bloat and smell. Putrefaction speeds up when the body is in a hot environment, which is why human remains are often kept in refrigerators until it's time for burial.

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During this bloating stage, the skin can slip and blister and marbling can occur, in which greenish-black blood vessels can be seen through the skin within about 24 to 48 hours of death, according to "Evaluation of Postmortem Change." Eventually, the bloat collapses, and in a process known as black putrefaction, the body's organs and tissues soften, and life forms such as insects and microbes eat the remaining soft tissues, leaving the skeletal remains.

"Decomposition significantly slows down at this [skeletal] stage, and it takes years or decades for the skeletal remains to disintegrate," according to "Evaluation of Postmortem Changes."

To delay decay, embalmers can drain the blood and other fluids from a corpse and replace it with embalming fluids they inject into the veins. These chemicals, which act as preservatives, stop the bacterial activity that breaks down the body. Although embalming is a common practice, some religions forbid it because it is considered a desecration of the body.

"If they're embalmed, it can really change things," Wescott told Live Science.

As an example, he pointed to the case of slain civil rights leader Medgar Evers, who was buried in 1963 after being embalmed. When his body was exhumed for evidence in a 1991 murder trial, Wescott said, "his body was so well preserved that they let his son in to see him."

For those who are embalmed and buried in a coffin, five to 10 years is a more typical decomposition timeline, he said. At that point, the tissue is gone and only bones remain.

The quality of the embalming job also plays a role, Wescott said. When he exhumed an embalmed body buried 15 years before exhumation, he discovered that it had skeletonized in part because the coffin had broken down. Another embalmed body he exhumed had been buried only a year, and "she looked like she just died, but had some mold growing on her," he recalled.

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Location can have an impact, too. If a casket is buried in acidic soil, it will erode faster, exposing the body to the elements, including insects, which abet the decomposition process.

There are a few other factors most people don't think about, Wescott said. In an outdoor setting, obese people initially decompose more rapidly in the beginning, but slow down compared with others later in the process because maggots prefer muscle tissue over fat. Chemotherapy and antibiotics used prior to death also can have a huge impact on decay, because both kill off some of the bacteria involved in the process.

As odd as it sounds, the coffin's liner might also have an influence on the pace of decomposition, Wescott said. Some materials wick fluid away from the body and could cause it to dry out, and even mummify more quickly. If the material holds moisture, the body could become soaked in its own fluids and decompose more quickly.

How long does it take for a body to decompose? (2)

David Volk

David Volk is a Seattle-based freelance journalist/humorist whose credits include Reuters, USA Today,fodors.comand a variety of alumni magazines. He writes about the lighter side of science, travel, food and business. He is the author of "The Cheap Bastard's Guide to Seattle" and "The Tribe Has Spoken: Life Lessons From Reality TV." He is currently collecting stories for a book he hopes to write about funerals gone wrong tentatively titled, "As I Die Laughing." You can find his regular humor posts on Medium.

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How long does it take for a body to decompose? (2024)

FAQs

How long does it take for a body to decompose? ›

However, on average, a body buried within a typical coffin usually starts to break down within a year, but takes up to a decade to fully decompose, leaving only the skeleton, Daniel Wescott, director of the Forensic Anthropology Center at Texas State University, told Live Science.

How long does it take for a body to fully decompose? ›

However, on average, a body buried within a typical coffin usually starts to break down within a year, but takes up to a decade to fully decompose, leaving only the skeleton, Daniel Wescott, director of the Forensic Anthropology Center at Texas State University, told Live Science.

What are the 5 stages of decomposition? ›

Decomposition is the process in which the organs and complex molecules of animal and human bodies break down into simple organic matter over time. In vertebrates, five stages of decomposition are typically recognized: fresh, bloat, active decay, advanced decay, and dry/skeletonized.

How long does it take for a body to start smelling? ›

A detectable decomposition smell begins within 24-48 hours as putrefaction sets in and intensifies any time between 4-10 days, depending on the conditions. The onset of putrefaction is determined by the green discoloration on the skin near the cadaver's large intestine and/or liver.

How long can a body be kept after death? ›

Refrigeration is an alternative option, which lasts longer than embalming. Morticians will keep the body in a fridge at two degrees Celsius instead of preparing the body with chemicals. However, you need to keep in mind that a refrigerated corpse will only last for three to four weeks.

How long do caskets take to decompose? ›

If the grave site is low on water content or moisture, metal caskets are known to last even longer, over five decades. Under favorable weather conditions, experts say that metal caskets may even last more than that – up to 80 years.

What does a body look like after being in the morgue for 3 weeks? ›

After two weeks, the body starts to bloat and change its color to red after the blood present in the body starts to decompose. Once the corpse surpasses the fourth week, you can witness liquefaction in the rest of the remains. The teeth and nails also begin to fall during this time frame.

How long after death does the body release fluids? ›

There are four general stages of putrefaction: Putrefaction (4-10 days after death) – Autolysis occurs and gases (odor) and discoloration starts. Black putrefaction (10-20 days after death) – exposed skin turns black, bloating collapses and fluids are released from the body.

What does a real decomposed body look like? ›

24-72 hours after death — the internal organs decompose. 3-5 days after death — the body starts to bloat and blood-containing foam leaks from the mouth and nose. 8-10 days after death — the body turns from green to red as the blood decomposes and the organs in the abdomen accumulate gas.

What happens to a body 4 days after death? ›

By three days, internal organs have decomposed. From three to five days after death, the body will begin to bloat from gasses produced from internal decomposition. The body could actually double in size and turn a greenish color. Extremely unpleasant and long-lasting odors called putrification begins.

What does it mean when you smell someone who passed away? ›

After someone dies, it's normal to see or hear them. Some people also reporting sensing the smell or warmth of someone close to them, or just feel a very strong sense of their presence. Sometimes these feelings can be very powerful. They may be comforting but also feel disturbing.

Why do you have to wait 3 days before cremation? ›

Why do you have to wait 3 days to cremate a body? In the United States, the law requires that a body must be held for three days before it can be cremated. This waiting period gives family and friends time to plan a funeral or memorial service.

What part of the body lasts the longest after death? ›

The skin is the last organ to die. The skin and its appendages still grow some days after being dead.

How long do embalmed bodies last? ›

Though the rate of decomposition varies depending on temperature, moisture levels, and other variables, an embalmed body will last inside a casket for many years. However, the goal of embalming is to make the body look as good as possible for the funeral, usually about a week after the process.

How long does it take for a body to turn black after death? ›

There are four general stages of putrefaction: Putrefaction (4-10 days after death) – Autolysis occurs and gases (odor) and discoloration starts. Black putrefaction (10-20 days after death) – exposed skin turns black, bloating collapses and fluids are released from the body.

Do embalmed bodies decompose? ›

Embalming does not stop decomposition; it just slows it down. Though the rate of decomposition varies depending on temperature, moisture levels, and other variables, an embalmed body will last inside a casket for many years.

How long does a body last in a lead-lined coffin? ›

Following royal tradition, which dates back as far as the 1600s, the queen's coffin was lined with lead, which ensures that her remains stay intact for up to a year. This is because the lead makes the coffin airtight, stopping moisture from getting in and therefore slowing down the decomposition of the body.

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