About KidsCalc

KidsCalc is a free collection of calculators and sizing guides built specifically for Australian parents. Every tool uses metric units, references Australian standards and guidelines, and is designed to answer the questions you're actually googling — in a shop, at the park, or at 11pm before a school ski trip.

Why Australian-specific matters

Most calculator and sizing guide websites are US-based. They use imperial measurements (pounds, inches, Fahrenheit), reference American product standards, recommend brands not sold in Australia, and size kids using US clothing, shoe and bike standards that don't match what you'll find on the shelf at Kmart, Target, or your local bike shop.

Australian parents end up converting units, second-guessing US sizing charts, and wading through irrelevant results. KidsCalc fixes that.

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Metric throughout

Centimetres, kilograms, litres. No unit conversion needed, ever.

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Australian standards

We reference AS/NZS standards, NHMRC guidelines, and Australian Road Rules — not US or EU equivalents.

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Australian brands & retailers

Size references match Target, Kmart, Big W, Cotton On Kids, and major Australian pharmacy brands.

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Built for mid-purchase

Fast, mobile-first results. Designed to be useful in a bike shop or shoe store, not just at home on a desktop.

Australian standards & guidelines we use

Where calculators reference specific standards or guidelines, we list the source. Here are the key ones:

NHMRC

National Health and Medical Research Council

Used for Australian dietary guidelines including daily water intake (Nutrient Reference Values for Australia and New Zealand), sleep recommendations, and general health reference data.

AS/NZS 2063

Australian/NZ Standard — Bicycle Helmets

The mandatory Australian standard for bike helmets (AS/NZS 2063:2008). All bicycle helmets sold in Australia must comply. Referenced in our helmet size calculator.

AS/NZS 1754

Australian/NZ Standard — Child Restraints for Motor Vehicles

The mandatory Australian standard for child car seats. Referenced in our car seat calculator alongside the Australian Road Rules age-stage requirements.

AU Road Rules

Australian Road Rules — Child Restraint Requirements

The national framework governing which car seat stage is required at each age. Enforced in all states and territories with minor variations.

NPS

NPS MedicineWise / Therapeutic Guidelines

Australian medication dosing guidance referenced in health calculators including our paracetamol dose calculator. Used alongside product consumer medicine information.

Raising Children

Raising Children Network

Australia's national parenting website, funded by the Australian Government. Referenced for developmental milestones, sleep recommendations, and general parenting guidance.

Important: health calculators are guides only

⚠️ Not medical advice

Health and medication calculators on KidsCalc — including the paracetamol dose calculator, water intake calculator, BMI calculator, and sleep calculator — provide general guidance only. They are not a substitute for professional medical advice, diagnosis, or treatment.

Always consult a qualified healthcare professional — your GP, paediatrician, or pharmacist — before making health decisions for your child, particularly regarding medication dosing. If you are concerned about your child's health, seek medical attention promptly.

In a medical emergency, call 000. For poisoning enquiries, call the Poisons Information Centre on 13 11 26 (24 hours, 7 days).

Sizing calculators (clothing, shoes, helmets, bikes) are practical guides based on published size charts and are not subject to the same medical caveat, but individual products vary — always check the specific product's sizing information before purchasing.

Who we are

KidsCalc is an independent Australian website created by parents, for parents. We are not affiliated with any brand, retailer, government agency, or healthcare provider. All calculators and content are provided free of charge. The site is supported by Google Display Network advertising — you may see ads while using the calculators.

We do our best to keep all information accurate and up to date. If you notice an error, an outdated standard reference, or a calculation that doesn't look right, please get in touch — we take accuracy seriously.

Get in touch

Contact KidsCalc

📧 General enquiries: hello@kidscalc.com.au

🔒 Privacy enquiries: privacy@kidscalc.com.au

🐛 Report an error or outdated information: hello@kidscalc.com.au

We aim to respond to all enquiries within 5 business days. KidsCalc is based in Australia.