Date math without the mess

Simple calculators for birthdays, generations, and life timelines.

Use precise browser-based tools to calculate your age, age on a past date, generation label, or percentage of an 80-year life already lived.

Today's ledger

Calculators

Choose a date tool

Calculate your exact age in years, months, days, and total days lived.

Find out how old someone was on a specific date in the past.

Enter a birth year to see the matching generation and date range.

Estimate the percentage of an 80-year life already lived and remaining.

Quick lookup

Browse age ranges, generations, and birthday milestones for any birth year from 1930 to 2025.