About this birthday countdown calculator
Calculate the time remaining until the next occurrence of a birthday.
How to use it
Enter the values requested by the calculator. Results update in your browser as you change the inputs. Review the assumptions shown on the calculator before using the result.
Formula
countdown = next birthday date − current date
Example
Enter a birth date to calculate the next birthday countdown from the current date.
Frequently asked questions
What does the birthday countdown calculator show?
Calculate the time remaining until the next occurrence of a birthday.
Are the results exact?
The result is calculated from the inputs and assumptions shown on this page. For important financial, health, tax, or legal decisions, verify the result with an appropriate professional or authoritative source.