Using the calculator
Enter the values requested above. Calculate age, next birthday timing and total days lived from a birth date.
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Birthday Calculator
Calculate age, next birthday timing and total days lived from a birth date.
Enter the details for your calculation
Use the values that match the situation you want to evaluate with the birthday tool. Results update as the inputs change.
Important: Use the inputs that match your situation. Results are estimates based on the values and assumptions entered.
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How to use this calculator
Reading the result
The main result shows age from the birth date you entered. Supporting results show the next birthday timing and total days lived.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.