Genealogy Suite
Free calculators and lookups for genealogists. No account required.
Type to filter the list of tools below.
Age at Date
Calculate exact age (years, months, days) at a given event date from birth date.
Census Year + Age → Birth Year
Estimate birth year from census year and age; optional birthday-before-census checkbox.
Day of Week
Find the day of the week (Sunday through Saturday) for any date.
Death Date + Age → Birth Date
Calculate birth date from date of death and exact age at death (years, months, days).
National Holiday Lookup
Search historical national and public holidays by country, name, or date.
Religious Holy Day and Feast Day Lookup
Lookup dates for Christian or Jewish holy or feast days by year.
Time Between Dates
Calculate the years, months, and days between two dates (accounts for leap years).
Abbreviation Lookup
Search common genealogy and record abbreviations with meanings and context.
Archaic Medical Term Lookup
Search historic medical terms and causes of death with modern equivalents and definitions.
DNA % to Centimorgans
Convert shared DNA percentage to centimorgans (cM) with configurable total and reference table.
Cousin Converter
Convert between cousin degree and common ancestor level; includes removed.
Roman Numeral Converter
Convert Roman numerals to their numeric value (e.g. MMXXIV → 2024).