Parenting calculators

Use these pages when you need a quick estimate, a planning date, or a clearer next step. They are built for everyday parent questions, not diagnosis or treatment. When symptoms, missed vaccines, feeding concerns, or growth worries are involved, use your pediatrician's advice as the final guide.

Parenting tools

Quick calculators for pregnancy and baby milestones

Use these tools when you want a fast answer without opening several tabs. Each one is built around common questions parents in the US ask most often.

Due Date Calculator

Estimate your due date and current pregnancy week from your last period.

Baby Age Calculator

See your baby’s exact age in months, weeks, and days.

Vaccine Schedule Calculator

Build a simple US infant vaccine timeline from your baby’s birth date.

Solids Readiness Calculator

Estimate a common solids start window and review readiness signs.

Growth Percentile Check

Get a quick estimate using age, sex, length, and weight.

Sister site

Need calculators outside parenting? Try Mega Calculators

The same maintainer behind MomTools also runs Mega Calculators — a hub of everyday calculators for currency, loans, savings, and unit conversions. If you frequently switch between parenting prep and household numbers, it’s a useful sister site to keep open in another tab.

Open Mega Calculators ↗

mega-calculators.com