Relationship Calculators
Free tools that answer a question about your own situation with real data, not a rule of thumb. Every calculator names the dataset behind it and the year it was pulled.
Updated: August 2026
Exact gap in years, months and days, plus where it sits among 61.2 million US married couples.
How These Tools Are Built
Each tool runs on a named dataset from a statistical agency or a peer-reviewed source, and says so on the page.
- Computed, not copied. The comparison figures come from Census microdata we process ourselves, so they are current rather than quoted from an older secondary source.
- Nothing is stored. Calculations run in your browser. The values you type are never sent to us and never saved.
- Free to embed. Every tool can be dropped into another site, with an attribution link included in the embed code.
The research behind the tools sits in our relationship and dating statistics hub.