Free Australian calculators for parents — metric, accurate, no signup.

Free Australian Calculators for Parents

Metric tools to help you choose the right size, understand health guidelines, and keep your kids safe — designed for Australia.

🇦🇺 Australian standards 📏 Metric units No signup needed

Most Popular

Kids Bike Size Calculator

Kids Shoe Size Calculator

Car Seat Calculator

Kids Paracetamol Calculator

Kids Sleep Calculator

All Calculators

Kids Bike Size Calculator

Find the right wheel size and frame by height, age, and inseam.

Kids Shoe Size Calculator

Measure foot length in mm and get AU, US, UK and EU sizes.

Kids Clothing Size Calculator

Get AU sizes for tops, bottoms and dresses with brand comparisons.

Kids Helmet Size Calculator

Measure head circumference for bike, ski, and skate helmet sizing.

Kids Ski Size Calculator

Choose the right ski length for your child's height and ability level.

Kids Backpack Weight Calculator

Find the maximum safe backpack weight based on your child's body weight.

Kids Water Intake Calculator

Daily water recommendations by age and weight, based on NHMRC guidelines.

Kids Sleep Calculator

Enter wake time to get the recommended bedtime and total sleep hours.

Kids Paracetamol Dose Calculator

Calculate the correct paracetamol dose in ml by your child's weight.

Kids BMI Calculator

Age-adjusted BMI using Australian growth chart reference ranges.

Baby Formula Calculator

How much formula to make per feed and per day for your baby's age.

Car Seat Calculator

Which car seat stage is right? Based on Australian Road Rules and AS/NZS 1754.

Kids Life Jacket Calculator

Find the right PFD level and size for your child's weight.

UV Sun Protection Calculator

How long your child can be outside safely based on UV index and SPF.

Screen Time Calculator

Recommended daily screen time limits by age, based on Australian guidelines.

NAPLAN Band Explainer

Understand what your child's NAPLAN band score means for their year level.

Kids Reading Level Calculator

See what reading level is expected for your child's age and year group.

No calculators matched "" — try a different search term.

kidscalc.com.au is a free resource for Australian parents offering metric calculators for everyday parenting decisions. Every calculator uses Australian standards — NHMRC nutrition guidelines, AS/NZS safety standards, and Australian Road Rules. Whether you're in a bike shop trying to pick the right wheel size, or working out whether your child can ride in a booster seat, our tools give you a fast, reliable answer without needing to sign up. All calculations happen in your browser — nothing is stored or sent anywhere. Last updated May 2026.