6.25
years
75
months
2,283
days
6.25
years
75
months
2,283
days
The Life Expectancy Calculator computes the average remaining lifespan for individuals who have reached a specific age, using life table data. Life expectancy at age x (ex) is calculated by dividing the total person-years lived by the cohort above that age (Tx) by the number of individuals alive at age x.
Life expectancy is one of the most important summary statistics from a life table. It is used in demography, actuarial science, public health, and population ecology to assess the health of populations, compare longevity across species or regions, and evaluate the impact of health interventions.
Life expectancy at age x is calculated as:
ex = Tx / lx
Where:
Tx is typically computed by summing the Lx values (person-years lived within each age interval) from age x to the last age class. The resulting ex tells you the average number of additional years a member of the cohort can expect to live.
Inputs
Results
With 75,000 total person-years from birth and 1,000 in the initial cohort, life expectancy at birth is 75 years.
Inputs
Results
The 800 survivors at age 60 can expect an average of 6.25 more years of life based on this life table.
Life expectancy at age x (ex) is the average number of additional years a person who has survived to age x can expect to live, based on the current mortality rates in the life table. It does not predict any individual outcome but gives the statistical average for the cohort.
Tx is the sum of all Lx values from age x to the final age class. Lx is the person-years lived within each age interval, typically calculated as Lx = (lx + lx+1) / 2 for each interval. Tx at the youngest age equals the sum of all Lx values in the entire table.
This can happen in populations with high infant or juvenile mortality. Once an individual survives past the dangerous early years, their remaining life expectancy may actually be higher than the life expectancy at birth, because they have passed through the highest-risk period.
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