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Life Minutes Calculator

Each cigarette costs about 20 minutes of life on the current estimate — 17 minutes for a man, 22 for a woman — so twenty a day for ten years is 73,000 cigarettes and roughly two years and nine months. Enter your own history for the full reckoning.

20 cigarettes
160
10 years
150

Total life lost to smoking

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Total cigarettes smoked

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Total minutes lost

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At your current rate — per year

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cigarettes/year

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life minutes lost per year

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days of life per year

How the figure is worked out

Two multiplications: cigarettes a day × 365 × years smoked gives the total cigarettes, and that total × 20 minutes gives the figure on screen. The readable form of it uses 365.25-day years and 30.44-day months, which is why a total can read as "2 years, 9 months" rather than as a pile of minutes.

The 20 comes from research by University College London, commissioned by the UK Department of Health and Social Care and published in the journal Addiction at the end of 2024. It puts the cost of one cigarette at about 20 minutes of life — 17 minutes for a man, 22 for a woman. GOV.UK reported it on 30 December 2024 under the headline "Quit for a week and save a day". This page multiplies by the single 20 rather than by the split, because it never asks your sex.

Until 21 August 2026 the constant here was 11 minutes, from a much older and much shorter paper: Shaw, Mitchell and Dorling in the BMJ in 2000, derived from mortality data on male British doctors and titled "Time for a smoke? One cigarette reduces your life by 11 minutes". The 2024 work revised that estimate upward and this tool moved with it, so every total the page prints is now about 82% larger than the one it printed before.

Two things have to be said next to either number. It is a population average, so it is not a debt any individual cigarette collects. And the loss is not spread evenly: people who develop lung cancer or COPD lose far more, and people who quit early recover much of it.

Nothing here measures anything about you. It multiplies a population average by a count you typed.

Where this comes from

  1. 1. Quit for a week and save a day, say health experts — the UCL estimate of about 20 minutes a cigarette, the constant this tool uses Department of Health and Social Care, GOV.UK, December 2024
  2. 2. Time for a smoke? One cigarette reduces your life by 11 minutes — the older estimate this tool ran on until August 2026 Shaw, Mitchell & Dorling, BMJ, 2000 (PubMed)

Nothing on this page is medically reviewed and nothing above measures anything about you — it explains a calculation. Where a number here is our own judgement rather than a published figure, the note says so and cites nothing; where the health bodies disagree, it carries the disagreement. Method last checked 21 August 2026.

The 20-Minute Finding

Where the Number Comes From

At the end of 2024 the UK Department of Health and Social Care published research by University College London, in the journal Addiction, putting the cost of a single cigarette at approximately 20 minutes of life — 17 minutes for a man, 22 for a woman. A 20-cigarettes-per-day habit therefore costs about 6.7 hours per day, or roughly 101 days of life per year. This tool runs on the 20.

The number this site used to print, 11 minutes, is older: Shaw, Mitchell and Dorling in the British Medical Journal in 2000, worked out from mortality data on male British doctors. The 2024 research revised it upward, and 20 is the figure the calculator now uses. GOV.UK reported the update on 30 December 2024 under the headline "Quit for a week and save a day".

Either figure is a population average across all smokers. The loss is front-loaded — smokers who develop serious diseases like lung cancer or COPD lose significantly more years, while others who quit early recover much of the expected deficit.

What Quitting Does to the Equation

Quitting smoking is the most impactful health intervention most people can make. Research from Doll et al. (British Doctors Study) found that quitting before age 35 restores life expectancy to near that of a non-smoker. Quitting before 50 eliminates about 50% of the excess mortality risk. Even quitting after 60 produces measurable benefit.

The calculator above represents the past. The future is determined by what you do starting now.

Frequently Asked Questions

Where does the 20 minutes per cigarette figure come from?
From research by University College London, published in the journal Addiction and commissioned by the UK Department of Health and Social Care. GOV.UK reported it on 30 December 2024: each cigarette costs approximately 20 minutes of life expectancy — 17 minutes for a man, 22 for a woman. It replaces the older 11-minute figure, which came from a 2000 study by Shaw, Mitchell and Dorling in the British Medical Journal and was revised upward by this work.

Is this figure accurate for everyone?
It is a population average. Individual loss depends on genetics, overall health, smoking intensity, and when you quit. But the directional truth is consistent: heavier, longer-term smokers lose more life expectancy. Quitting at any age reduces the trajectory.

Can I actually get those minutes back by quitting?
Not the lost years directly — but quitting smoking dramatically reduces further loss. Research shows that quitting before 40 eliminates about 90% of the excess mortality risk from smoking. Quitting at 50 still eliminates about 50%. The sooner you quit, the more you save.

Does filter type or cigarette brand affect the 20-minute figure?
"Light" or filtered cigarettes were shown in multiple studies to provide no meaningful reduction in mortality risk. Smokers compensate by inhaling more deeply. The 20-minute estimate applies broadly regardless of brand.

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