Calculate Age in Days Online
Enter your birth date to see how many days old you are, along with weeks, months, hours, and minutes. Leap years and varying month lengths are handled so the total is exact.
Age Calculator
Calculate your exact age in years, months, and days
Defaults to today
Select your date of birth above to calculate your age.
Quick Start
- 1Enter your date of birth
- 2Leave the target date as today or set a custom date
- 3Read your age in days, weeks, and other units
- 4Check the countdown to your next birthday
More Calculate Tools
All calculators →Calculate a chmod Permission Online
Build Unix file permissions and the chmod command visually. Free chmod calculator with octal and rwx output, no signup.
Calculate CIDR to Subnet Mask Online
Convert a CIDR prefix to a dotted-decimal subnet mask and wildcard mask. Free online CIDR to subnet mask calculator.
Calculate Usable Hosts Per Subnet Online
Find how many usable hosts a /24, /26, or any prefix holds. Free online subnet host count calculator with usable range.
Calculate Which CSS Selector Wins
Compare two CSS selectors and see which one wins by specificity. Free online CSS specificity calculator with a bar chart, no signup.
Standard Deviation Calculator Online
Calculate sample and population standard deviation, variance, and mean from your data. Free online calculator with step-by-step working and charts.
Mean, Median, and Mode Calculator
Calculate the mean, median, mode, and range of a data set online for free. Includes quartiles, charts, and step-by-step working in your browser.
Looking for FAQs and advanced options? Visit the full Age Calculator page →