The Average Person Walks Past a Murderer 36 Times in Their Life

Quick Answer

Based on statistical modeling using murder rates, population density, average lifespan, and the number of strangers a person encounters daily, the commonly cited estimate is that the average person walks past roughly 36 murderers during their lifetime. This is not a precise figure -- it is a back-of-the-envelope calculation that varies enormously depending on where you live, how often you are in public spaces, and what country's crime statistics you use. But the underlying math is sound enough that the true number is almost certainly greater than zero.

The Viral Number

You have probably seen this statistic float past on social media, presented as a chilling factoid alongside a stock photo of a crowded street. "The average person walks past 36 murderers in their lifetime." Sometimes the number is 16, sometimes 36, sometimes higher. The figure varies because the calculation depends on assumptions that are hard to pin down.

But the core idea is not internet nonsense. It is a straightforward statistical exercise, and when you walk through the math, the result is genuinely unsettling.

Let us work through it.

The Calculation

To estimate how many murderers you might unknowingly encounter, you need four numbers:

How many strangers do you walk past each day?
What fraction of the population has committed murder?
How many years of public activity do you have?
What is the probability of encountering a unique murderer on any given day?

Strangers Per Day

This varies wildly. A person living in rural Montana encounters far fewer strangers than someone commuting through Manhattan. Research on urban pedestrian encounters suggests that a typical city dweller passes within close proximity of roughly 500 to 1,000 strangers per day -- on sidewalks, in stores, on public transport, in office buildings.

For suburban and rural residents, the number drops significantly. A commonly used middle estimate for the general population is around 600 strangers per day.

Murderers in the Population

In the United States, roughly 21,000 to 26,000 homicides occur annually (FBI Uniform Crime Reports data, 2020-2023 range). Not all murderers are caught, and not all who are caught are convicted, but let us work with the total number of people who have committed homicide at some point in their lives.

The Bureau of Justice Statistics estimates there are roughly 1.5 to 2 million people in the US who have been convicted of homicide at some point (including those currently incarcerated, on parole, or who have completed sentences). Add an estimated 40 percent for unsolved homicides where the perpetrator was never caught, and you get roughly 2 to 2.8 million living Americans who have killed someone.

Against a population of 330 million, that means roughly 1 in 120 to 1 in 165 people in the United States has committed a homicide. Let us use 1 in 140 as a working estimate.

The Math

If you encounter 600 unique strangers per day and 1 in 140 of the general population has committed homicide, then on any given day you have a reasonable probability of encountering approximately 4.3 murderers (600 / 140).

But wait -- many of those daily encounters are with the same people (coworkers, neighbors, regular commuters). The number of truly unique strangers you encounter per day is lower. And we should be looking at encounters over a lifetime, not just a single day.

A more conservative approach: assume you encounter roughly 10 to 20 truly unique strangers per day (people you will never see again), and that you do this for about 50 years of adult public life. That is roughly 180,000 to 365,000 unique stranger encounters over a lifetime.

Multiply by the fraction who are murderers (roughly 1/140), and you get approximately 1,300 to 2,600 lifetime encounters with murderers.

That seems too high, and it probably is -- the 1-in-140 figure includes incarcerated individuals who are not walking around in public. Adjust for the roughly 50 percent who are currently imprisoned, and you get 650 to 1,300 encounters.

Where Does 36 Come From?

The "36" figure appears to use much more conservative assumptions: fewer daily encounters (perhaps 10-25 unique strangers), a lower homicide prevalence rate, and a shorter active period. Different starting assumptions yield different results, and 36 likely comes from a calculation that emphasizes close-proximity encounters (people within arm's reach, not just in visual range) and uses a narrower definition of "murderer."

The honest answer is that the precise number does not matter. Whether it is 16 or 36 or 360, the statistical reality is the same: over the course of a long life in a society where homicide occurs, you will almost certainly have been in close physical proximity to multiple people who have taken a human life.

Why This Feels So Disturbing

The unsettling power of this statistic comes from the gap between appearance and reality. Murderers do not look different from anyone else. There is no mark, no uniform, no reliable behavioral tell. The person behind you in the grocery store line, the commuter sitting across from you on the train -- statistically, some of them have killed someone.

Tip

Most homicides are committed by people known to the victim -- a domestic partner, a family member, an acquaintance. The stereotype of the stranger murderer is statistically rare. Most people who have committed homicide are not serial predators; they are individuals who killed in specific circumstances -- domestic violence, arguments that escalated, gang violence, robbery gone wrong. Many are deeply remorseful and never offend again.

This is an important nuance. The "36 murderers" framing implies danger -- as if these encounters were near-misses. In reality, the vast majority of people who have committed homicide pose no threat to a random stranger. The circumstances that led to their crime were typically specific and personal.

The Geography Factor

Where you live changes the math dramatically. The US homicide rate (about 6.3 per 100,000 in 2023) is far higher than Western European countries (typically 0.5 to 1.5 per 100,000). Japan's rate is 0.2 per 100,000. Living in Tokyo versus living in St. Louis produces vastly different lifetime encounter estimates.

Within the US, rates vary by city. Cities like St. Louis, Baltimore, and New Orleans have homicide rates of 40-60 per 100,000, while cities like Irvine, California sit below 1 per 100,000. A lifetime spent in a high-crime city could push the number far above 36. A lifetime in a safe suburb brings it close to zero.

Population density matters too. In a dense urban environment, you encounter far more strangers daily. In a rural setting, you might go days without encountering a single person you do not already know. The "36" figure is implicitly calibrated for someone living in a moderately dense area with moderate crime rates.

What Should You Do With This Information?

Nothing, really. This is a fascinating statistical exercise, not an actionable safety tip. You cannot identify murderers by looking at them, and the probability that any specific stranger you encounter is a threat to you is vanishingly small.

The statistic is valuable not as a source of anxiety but as a reminder that the world is full of invisible complexity. Every person you pass on the street has a complete, unknowable history. Some of those histories contain terrible things. Most do not. You will never know which is which, and that is probably fine.

The 36-murderers statistic is ultimately a Rorschach test. Some people find it terrifying. Others find it oddly comforting -- proof that we coexist with darkness every day and almost nothing bad happens. Both reactions are valid.