Longevity · Free calculator

Life expectancy calculator: how your habits add years.

Estimate how long people like you tend to live, and see which habits move the number — from national life tables and the research on five everyday habits.

By Aziz Mezlini, PhD · Founder & Scientist, Carthalis · Updated 2026-05-25

A Statistics Canada conditional-life-table baseline adjusted for the lifestyle factors with the strongest mortality evidence (smoking, BMI, activity, diet pattern, alcohol — Li 2018, Kitahara 2014). Computed entirely on this page — nothing is stored.

Estimate your life expectancy

A Statistics Canada baseline adjusted for the lifestyle factors with the strongest evidence in Li 2018. Wellness education — not a clinical prediction.

Your inputs

We don't store these values. Age and sex are required; every other field improves the estimate but is optional.

Your result

Fill in your inputs to see your personalised result here. The calculator runs entirely on this page — no signup required to try.

Population-level estimate, not a personalised clinical prediction. Wellness education, not diagnosis.

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Methodology

  • Baseline: Statistics Canada — Life tables, Canada (Table 13-10-0114-01)
  • Lifestyle modifiers: Li, Y. et al. (2018). Impact of healthy lifestyle factors on life expectancies in the US population. Circulation 138(4):345–355. DOI: 10.1161/CIRCULATIONAHA.117.032047
  • BMI ≥30 obesity bands: Kitahara, C.M. et al. (2014). Association between Class III Obesity and Mortality: A Pooled Analysis of 20 Prospective Studies. PLOS Medicine 11(7): e1001673

This is a population estimate from your habits, not a clinical prediction. Your Digital Twin goes further, building on your biological-age estimates.

This is one small piece of Carthalis. The app tracks 140+ insights from your own data — sleep, labs, nutrition, fitness and more — explains what they mean, and helps you act on what matters.

See everything Carthalis does →

What a life expectancy estimate tells you

A life expectancy calculator starts from how long people of your age and sex live on average, then adjusts for habits with strong evidence behind them. The result describes people like you — it is not a prediction of your own lifespan.

  • Where you start

    Average remaining years for your age and sex, from national life tables.

  • What moves it

    Not smoking, a healthy weight, regular activity, a good diet and moderate alcohol.

  • Why it helps

    It shows which habits matter most — and how much changing one could add.

What it can't tell you

  • No calculator can predict an individual lifespan; illness, accidents and medical advances all change the picture.
  • The estimate leaves out your health conditions, lab results and family history.
  • Use it for motivation and planning, and talk to your doctor about health decisions.
How it's calculated, sources and more

Method and sources

The baseline is the average remaining years for your age and sex from Statistics Canada's life tables (Table 13-10-0114-01). It is then adjusted for five habits using the effect sizes from Li et al. (2018, Circulation) — smoking, body-mass index, physical activity, diet quality and alcohol — with BMI ranges informed by Kitahara et al. (2014). Everything runs in your browser; nothing is stored.

In Carthalis, your Digital Twin estimates life expectancy from your age, sex and your combined age estimates (heart, fitness, blood, face, ear and epigenetic age), so it reflects more of what you share — and you can follow it over time. It is marked as an experimental estimate.

Common questions

A life expectancy calculator estimates how long people like you tend to live, from population data and lifestyle. The free calculator on this page uses Statistics Canada life tables adjusted for five habits — smoking, BMI, exercise, diet and alcohol (Li 2018). It is a population estimate to motivate healthy habits, not a prediction for you.

Statistics Canada life tables for the baseline by age and sex, adjusted for five lifestyle factors — smoking, BMI, physical activity, diet and alcohol — using effect sizes from Li et al. (2018). It runs on this page and stores nothing.

After a meaningful change — quitting smoking, becoming more active or changing your weight — or about once a year. In Carthalis, your Digital Twin keeps a fuller estimate you can follow over time.

No. It is an educational estimate for people like you, not a prognosis for you, and it is not a diagnosis or treatment decision. Talk to your doctor about your health.

Follow your longevity estimates over time

Create a free account to keep this estimate in your Digital Twin and see it next to your biological, heart and fitness age as you share more.

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