how to calculate age from date of birth
How to Calculate Age from Date of Birth
Age calculation is needed for forms, admissions, jobs, and legal eligibility checks.
Bangladesh-focused guide with practical calculation workflow.
Step-by-Step Explanation
- Take date of birth and current date
- Subtract year, month, and day sequentially
- Adjust borrow logic for month/day mismatch
Formula Used
- Age = current date - date of birth (in years, months, days)
Example Calculation
- DOB 2000-05-20 and current 2026-03-12 -> age is 25 years, 9 months, 20 days.
Common Mistakes
- Ignoring leap-year date handling
- Using year difference only
FAQ
- Can age calculator handle future DOB? It should reject invalid inputs.
- Is exact day count useful? Yes for documentation.
Related Calculators
- Open: /calculators/age-calculator
- Open: /calculators/date-difference-calculator