Can I calculate future ages?
Yes. Set the reference date to any day in the future to see how old you or someone else will be on that date.
Step-by-step walkthrough
Age Calculator Guide
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Before you start
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
- age
- difference
- date
Detailed procedure
Step 1
Enter the birthdate (or starting date).
Step 2
Set the reference date; leave it as today for a current age.
Step 3
Review the exact age along with total days and weeks displayed below.
Teaching & troubleshooting tips
Why can’t the reference date be earlier than the birthdate?
Negative ages don’t make sense, so the calculator requires the reference date to be the same as or later than the start date.