Genealogy Date Calculator
Calculate an ancestor's age at a historical event, generation number, and century.
How to Use the Genealogy Date Calculator
- Enter the ancestor's birth year.
- Enter the year of the historical event.
- Click Calculate to see age, generation, and century.
使用场景
- •Family history and genealogy research.
- •Historical context for ancestry records.
- •Estimating generations back from a common ancestor.
公式
Formula: Age at event = Event Year − Birth Year. Generation ≈ Age / 25. Century = ⌈Event Year / 100⌉.
常见问题
How many years is a generation?
A generation is typically 25–30 years for genealogical purposes, representing the average age at which people had children historically.
How do I handle BCE dates?
Enter negative years for BCE dates (e.g., −100 for 100 BCE). The calculation still works correctly for age differences.
What events can I use this for?
Marriage, migration, military service, land grants, census records, or any documented historical event in your family research.