About AgeGapCalc
AgeGapCalc is a small, independent site with one job: compute age differences accurately and explain the context around them neutrally. No accounts, no tracking of your calculations, no editorializing about anyone’s relationship.
What the site does
Two calculators, built and tested with the same core logic: an age difference calculator that works from two birthdays or two ages, and a dating age rule calculator that applies the half-your-age-plus-7 rule. Around them, a set of guides and reference tables explains how the arithmetic works and how age gaps between adults are commonly discussed.
How the calculators work
All computation happens in your browser using plain calendar-date arithmetic: full years, then months and days with borrowing, UTC date components only, and explicit conventions for leap years and February 29 (documented in our exact age difference guide). The same pure functions are covered by automated tests for edge cases — leap days, month boundaries and invalid input.
Editorial standards
The half-your-age-plus-7 rule is a folk guideline, and we cover it descriptively: what it says, where it is commonly traced from, and what both supporters and critics argue. We do not endorse it, and we do not judge real relationships. Every example, table and FAQ on the site uses adult ages of 18 and above; calculators reject ages below 18. Our commitments are spelled out in the Terms and disclaimer.
Feedback
Spotted an error or have a suggestion? We would genuinely like to hear about it — reach us via the contact page.