Corrected Age Calculator
Estimate corrected age using birth date and due date, commonly used for preterm development tracking.
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Formula
How it works: The calculator estimates weeks early from due date and then adjusts chronological age to produce a corrected age estimate.
Worked Example
Why Corrected Age Matters for Premature Babies
Corrected age adjusts a premature baby chronological age by subtracting the weeks they were born early. This gives a more accurate reference for developmental milestones.
- A baby born 8 weeks early at chronological age 6 months has a corrected age of 4 months
- Developmental milestones (sitting, crawling, first words) should be compared to corrected age, not chronological age, for preterm infants
- Most pediatricians use corrected age until the child is 2 to 3 years old, after which developmental differences typically resolve
- Corrected age is especially important for very preterm babies (born before 32 weeks) where the developmental gap is most significant
Always discuss milestone concerns with your pediatrician, who can provide personalized guidance based on your baby specific circumstances.
You can also calculate changes using our Gestational Age Calculator, Exact Age Calculator or Chronological Age by Date Calculator.
Frequently Asked Questions
How is corrected age calculated?
Corrected age equals chronological age minus the number of weeks the baby was born early. If your baby is 6 months old but was born 2 months early, their corrected age is 4 months.
Does this replace medical guidance?
No. Use this as an informational tool. Your pediatrician will use corrected age alongside other assessments to track your baby development appropriately.
When should I stop using corrected age?
Most healthcare providers recommend using corrected age until the child is 2 years old for general milestones, and up to 3 years for very premature babies. After that, most developmental differences have resolved.
Is corrected age used for school enrollment?
Generally no. Schools use chronological age (actual birth date) for enrollment. However, if prematurity significantly affected development, discuss options with your school district.
Does corrected age apply to full-term babies?
No. Corrected age only applies to babies born before 37 weeks gestation. Full-term babies (37+ weeks) use their chronological age for all milestone tracking.
Is it possible to embed the Corrected Age Calculator on another website?
Yes, embedding the Corrected Age Calculator is free. Hit the "Embed" button on this page, adjust the width, height, and theme, then grab the iframe code. It works on WordPress, Wix, Squarespace, Shopify, and plain HTML pages. No registration needed. Full instructions at calculory.com/services/embed-calculators.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
AI Assistant
Ask about this calculator
I can help you understand the corrected age calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
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