Health & Fitness
Corrected Age Calculator
Calculate corrected age for preterm infants.
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
What is corrected age?
Age adjusted for prematurity, used to assess development in preemies until age 2-3.
When to stop using corrected age?
Usually by age 2-3, most preemies catch up developmentally.
Why is this important?
Preemies need extra time to reach milestones. Using corrected age prevents false developmental concerns.
Related tools
About this tool
Inputs
- Birth Date
- Gestational Age at Birth (weeks)
- week
- weeks
- day
- days
- Expected Milestones
- Week
- No upcoming milestones
Results
- Chronological Age
- Corrected Age
- Adjustment
When precision matters, guesswork falls short. The Corrected Age Calculator applies the correct formula to the values you enter and returns a clear result. The required inputs are birth date, gestational age at birth (weeks), week, weeks, day, days, expected milestones, week and no upcoming milestones. Once provided, the result — chronological age, corrected age and adjustment — appears instantly. Basal metabolic rate estimates use equations like Harris-Benedict or Mifflin-St Jeor, which factor in age, sex, height, and weight.
Health metrics give you a snapshot of where you stand, but they are not a diagnosis. Age, sex, ethnicity, and fitness level all influence what counts as a healthy range for you. The ability to calculate corrected age for preterm infants comes up more often than most people expect — in professional work, academic projects, and everyday planning. Results are rounded for display; the underlying computation retains full precision. Consider multiple indicators together rather than focusing on a single number.