Age Gap Calculator

An age gap calculator measures the difference in age between two people precisely — in years, months, and days. It is commonly used for couples, siblings, or parent-child comparisons, as well as genealogical research

The calculator uses the standard published formula for age gap. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.