Births & Baptisms » Birthdate Calendars and Calculators

Birth Date Calculator

Birth Date Calculator

[The original link is broken. This link points to an archived copy on the Wayback Machine]

Birth Date Calculator

Birthdate Calculator

Census Online - Tools - Birth Year Calculator

Date Calculator

By Acute Software. Simple utility to calculate the number of days, weeks, months or years between any two dates.

Determining Time between Two Events in One Step (or Determining Birthdate from Deathdate and Age)

Estimate Life Events Dates

Javascript utility page. Input current age or year of birth, U.S. high school or college graduation or death. It generates a web page with charts showing estimated year of births, graduations, deaths for that person and parents. Assumes all dates are 31 December.

Family Historian Users Group - Spreadsheet: Birth Date Calculator V4

FamilySearch Wiki - Date Calculator

JavaScript Birthdate Calculator

Calculates birthdate from death date and age of death in day/month/year format.

JavaScript Birthdate Calculator

Narrowing birth dates — a free tool does the math for you

Parallax View - Analyses the overlap between multiple date ranges

Analyses the intersections of a list of separate date ranges and reports the effective overlap (may be multiple if disjoint ranges). For instance, if you have several calculated ranges describing the same birth event then this form will calculate the smaller range over which they all overlap. The 'Remember' button of the Birth Date calculator (above it) can also add to the list of ranges. Entries can be ticked as 'ignore' to remove outliers before a re-analysis. The 'Bar Chart' button shows (or hides) a more detailed chart showing the overlap contributions across the whole date range. This may be useful if the ranges actually describe distinct events rather than just one.

Parallax View - Birth-Date Calculator

Calculates range of possible birth dates given an age (in years and/or months) and a date-of-recording, Contains options to help with early Canadian census, and 1841 census of England and Wales.

Sorted By Birth Date - Birthdate Calculator

New feature. Enter the date of the event and a person's age in years, months and days, to see the person's date of birth. Many death records and cemetery monuments give the age in years, months and days instead of the date of birth.

The Olive Tree Genealogy: Date of Birth Calculator

VGS Birthdate Calculator

From the Victoria Genealogical Society in British Columbia, Canada.