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All Age Calculators
Browse every age calculator available on the site, grouped by use case so you can jump from a broad question to the exact tool.
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Popular Age Calculators
Start with the most common age calculators, then use the category sections below for the complete tool directory.
Main tool
Chronological Age Calculator
Calculate exact chronological age in years, months, days, total days, and birthday countdown.
Open calculatorDate tools
Age Difference Calculator
Compare two dates of birth and find the exact calendar age gap.
Open calculatorDate tools
Calculate Birth Year From Age
Find the likely birth year or birth date range from an age and reference date.
Open calculatorBaby age
Adjusted Age Calculator
Estimate adjusted age for a baby born before full term.
Open calculatorCultural age
Lunar Age Calculator
Calculate Chinese lunar age, also called traditional virtual age.
Open calculatorAnimal age
Cat Age Calculator
Estimate a cat's age in human years using common life-stage rules.
Open calculatorHealth age
Biological Age Calculator
Estimate wellness age from basic lifestyle and body indicators.
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Find Calculators by Use Case
Each category links to its hub page and to every calculator in that topic.
General Age Calculators
Chronological age, age difference, birth-year, and dating-age-rule tools.
Baby Age Calculators
Gestational, adjusted, ASQ, and baby age tools for pregnancy and early development context.
Animal Age Calculators
Animal age conversion calculators for cats, dogs, horses, birds, and hamsters.
Health Age Calculators
Heart age, biological age, metabolic age, menopause age, and health-related tools.
Sports Age Calculators
Eligibility age calculators for USA Softball, USSSA, Little League, and youth-sports cutoffs.
Cultural Age Calculators
Calendar-based tools for Chinese lunar, Korean, Hijri, and traditional age systems.
School Age Calculators
School start-year, grade-timeline, cutoff eligibility, and exact testing-age tools for families and educators.