Work out life table survival probability instantly with clear inputs, formula shown and shareable results.
A life table records the number of survivors lₓ at each age. The chance of living another n years is simply the ratio of survivors, ₙpₓ = lₓ₊ₙ/lₓ, and the complement is the probability of death within that window.
Survival probability
ₙpₓ = lₓ₊ₙ / lₓ; ₙqₓ = 1 - ₙpₓ
It converts the multi-year probability into the constant yearly mortality that would produce the same n-year survival, which makes different intervals comparable.
Static tables do not. Projected or generational tables apply improvement factors by year of birth.