Age by Weeks Calculator
Discover exactly how many weeks old you or your child are with our precise week calculator
Birth Date Information
Leave blank to calculate age from today
Your Age Results
Total Weeks
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Total Days
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Years:Months:Weeks
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Enter your birth date to see developmental milestones for that age.
Age Comparison
Your age comparison with common references will appear here.
👶 Developmental Milestones by Weeks
Newborn Stage
- Sleeps 16-17 hours daily
- Startles at loud noises
- Can focus 8-12 inches away
First Smiles
- Begins social smiling
- Lifts head briefly during tummy time
- Follows objects with eyes
Increased Awareness
- Begins to babble
- Grasps objects intentionally
- Rolls from tummy to back
Mobility Begins
- Sits without support
- Crawls or scoots
- First words may appear
Toddler Development
- Walks independently
- Says several words
- Points to objects
Early Childhood
- Runs and climbs
- Speaks in short sentences
- Shows independence
🤰 Pregnancy Week Comparison
First Trimester
Weeks 1-13
Second Trimester
Weeks 14-26
Third Trimester
Weeks 27-40
Note: Full-term pregnancy is typically 40 weeks (280 days) from last menstrual period.
🐶 Animal Age Comparison
Dog Years
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1 human year ≈ 7 dog weeksCat Years
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1 human year ≈ 4 cat weeksMouse Years
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1 human week ≈ 1 mouse monthElephant Years
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1 human year ≈ 0.2 elephant weeks
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Note: This calculator provides approximate age in weeks based on calendar calculations. Results may vary slightly due to leap years and other calendar adjustments.