About LeGrandAge
LeGrandAge is a collection of free tools for your personal dates: exact age, birthdays, milestones, relationships and calendar calculations.
Your dates, your device
Calculations run in your browser. No account or paid API is needed. Compatible tools reuse the dates you enter, so you can keep exploring without starting again.
Clear conventions
Each tool explains its calendar conventions and includes an example. These tools do not provide medical, legal or life-expectancy predictions.