Plan baby life with simple, accurate calculators
Free, mobile-friendly baby and parenting calculators for planning diapers, feeding, sizing, and the nursery.
Free, private tools for nappies, feeding, sizing, sleep, and more — built for your phone and easy to share.
Browse by category
Diapers
Estimate diaper costs and how many you'll need.
Baby Feeding
Plan formula amounts by your baby's weight and age.
Baby Sizes
Convert baby clothing sizes across countries.
Nursery
Find a comfortable humidity range for the nursery.
Baby Sleep
Build sleep schedules and wake windows by age.
Pregnancy
Estimate your due date and track pregnancy weeks.
Baby Gear
Budget a registry and check gear fit helpers.
Why parents use BabyPlanner
- ✅ Works on your phone, even offline after the page loads
- ✅ One-tap Copy and Share for every result
- ✅ Clear explanations, real examples, and helpful FAQs
- ✅ Honest estimates — never medical claims or guarantees