Calculating your age in days is a fairly simple calculation of multiplying your age by the days in a year and adding the days since your last birthday. Make an adjustment for leap years.Continue Reading
Calculate your age in years. If unsure, subtract your birth year from the current year if your birthday has occurred in the current year. Use a calendar to determine how many leap years there have been since your birth.
Multiply your age in whole years by the number of days in a full year, 365.
Add the total number of leap days (one per leap year) and the days for each month since your last birthday. This total is your age in days.