Life Percentage Calculator

Life percentage expresses what fraction of your expected lifespan you have already lived, and what fraction is left. It needs your date of birth and a life expectancy figure, and it is uncomfortable in a useful way.

Life lived formula: % Lived = (Current Age ÷ Life Expectancy) × 100

Life remaining formula: % Remaining = ((Life Expectancy − Current Age) ÷ Life Expectancy) × 100

Years remaining: Years Left = Life Expectancy − Current Age

Days remaining: Days Left = Years Left × 365.25

Where:

• Current Age - your age in years, decimals allowed (35.5 years is fine)
• Life Expectancy - the age you expect to reach. It varies by country, by sex, and by your own health, and see the note below on why the national figure understates it once you are past middle age

Rough life expectancy at birth, for reference:

• World average: 73.3 years
• United States: 79.3 years (female 81.4, male 76.3)
• Japan: 84.3 years
• United Kingdom: 81.7 years
• Brazil: 75.9 years
• India: 70.8 years
• Nigeria: 54.4 years

Conditional life expectancy, which most people get wrong

The figure quoted for a country is life expectancy at birth, and it is dragged down by everyone who died young. Having already reached 60, you have outlived those people, so your own expectancy is higher than the headline number. A 60-year-old American man can reasonably expect to reach 82, not the 76 the national figure suggests. Put the higher number in, or this calculator will tell you that you have less time than you do.

Worked example: Person born March 15, 1985. Current date: April 8, 2026. Life expectancy: 82 years.

• Current age = 41.07 years
• % Lived = (41.07 ÷ 82) × 100 = 50.1%
• % Remaining = 100 − 50.1 = 49.9%
• Years left = 82 − 41.07 = 40.93 years
• Days left = 40.93 × 365.25 = 14,950 days

Perspective: At 41, roughly half of life remains. Nearly 15,000 days sounds like a great deal. Drawn as a grid of dots, one per day, it fits on a single sheet of paper.