WiseCalcs

Life expectancy calculator

Enter your age and sex, then pick your smoking status, activity level, and diet quality. The calculator shifts a baseline expectancy by each factor and shows an estimate plus the years it implies remain.

Use it to see how lifestyle factors nudge a rough life-expectancy estimate — for awareness, not prediction.

Life expectancy

76 years

Years remaining
36 years

The result updates as you choose. The headline is the estimated life expectancy; the second figure is the years it suggests remain from your current age.

How does it work?

This is a simplified illustration, not a medical or actuarial forecast. Real life expectancy depends on genetics, healthcare, environment, and chance. Smoking subtracts 9 years; activity ranges −2 to +3; diet −2 to +2.

Life expectancy estimate

L=basesex+Δsmoke+Δactivity+ΔdietL = \text{base}_{sex} + \Delta_{\text{smoke}} + \Delta_{\text{activity}} + \Delta_{\text{diet}}
L
Estimated life expectancy in years.
base
Baseline by sex: 76 male, 81 female.
\Delta
Adjustments for smoking, activity, and diet.

A non-smoking, highly active man with a healthy diet: 76 + 0 + 3 + 2 = 81 years.

Method & sources

Baseline is 76 years for men and 81 for women. Smoking subtracts 9 years; activity ranges −2 to +3; diet −2 to +2. Years remaining is the estimate minus your current age, floored at zero.

Sources

Where this method comes from — use these references to understand the formula, assumptions, and limits.

How we calculate

  • Baseline is 76 years for men and 81 for women.
  • Smoking subtracts 9 years; activity ranges −2 to +3; diet −2 to +2.
  • Years remaining is the estimate minus your current age, floored at zero.
  • This is a simplified illustration, not a medical or actuarial forecast.

Rounding

Years are shown as whole numbers. The calculation uses full precision.

What this calculator does

This calculator starts from an average life expectancy by sex and adjusts it for a few well-known lifestyle factors: smoking, physical activity, and diet. It is a simple illustration of how habits relate to longevity, not a personalised forecast.

How to use it

  1. Enter your current age and sex.
  2. Choose whether you smoke.
  3. Pick an activity level and a diet quality.
  4. Read the estimate and the years it implies remain.

A worked example

A non-smoking, highly active man with a healthy diet: 76 baseline + 0 + 3 + 2 = 81 years. Adding smoking would subtract 9, dropping it to 72.

What it can't capture

Real life expectancy depends on genetics, healthcare access, environment, income, and chance — none of which this simple model sees. Treat the number as a conversation starter, not a prediction.

Common mistakes

  • Reading the estimate as a personal forecast.
  • Assuming the adjustments are precise medical figures.
  • Ignoring that many real factors are left out entirely.

When it's useful

For general awareness of how lifestyle relates to longevity, or as a nudge toward healthier habits — never as a medical assessment.

FAQ

How accurate is this?
It's a simplified illustration, not a forecast. Real life expectancy depends on far more than these few factors.
Where does the baseline come from?
It uses round average figures — 76 for men and 81 for women — as a starting point before adjustments.
How much does smoking change it?
In this model, smoking subtracts 9 years, reflecting the large effect smoking has on longevity in real studies.
Why isn't my exact country reflected?
The model uses generic averages. Actual figures vary by country, era, and many personal factors.
Should I make decisions based on this?
No. For health decisions, consult a doctor. This tool is for general awareness only.
Can I share a calculation?
Yes. Use Share to copy a link that reopens the calculator with the same inputs.

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<iframe src="https://wisecalcs.com/embed/en/life-expectancy-calculator" width="100%" height="520" style="border:0" loading="lazy"></iframe> <p>Calculator from <a href="https://wisecalcs.com/en/health/life-expectancy-calculator">WiseCalcs</a></p>