Australia's Free Calculator Hub
Free calculators for health and fitness, Australian tax and super, mortgages, math, building and everyday tools. Metric-first, no sign-up. Results are estimates for general information.
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❤️ Featured: Health & Fitness Calculators
Our largest category — fitness and calories, nutrition and healthy weight, women's health, and heart and general health, all metric-first.
Health calculators give general estimates from standard formulas and are not medical advice. The nutrition, body-composition and calorie tools are designed for adults, not children or teenagers. Speak to a doctor, dietitian or midwife about your own health.
Browse all health & fitness calculators →🔢 Math & Science Calculators
Fractions, percentages, algebra, statistics, geometry, and more.
🇦🇺 Australian Tax & Finance Calculators
Australian tax and finance calculators with financial-year-specific guidance, including verified 2026–27 information. Check the year shown on each calculator page.
💰 Tax & Super
🏦 Financial, Mortgage & Investing
Mortgage, investment, retirement and 60+ Australian financial calculators.
🏗️ Building & Property Calculators
Materials, structure and property calculators. Building results are estimates; confirm structural and compliance matters with a licensed professional.
🛠️ Other Calculators & Tools
Date and time, everyday utilities, electronics, and free browser-based tools.
📚 Educational Guides
Published by MegaCalcOnline.com. Guides show the financial year their figures apply to — some are historical 2025–26 guides.
Health & fitness guides
Australian tax, super & property guides
▶️ Video Tutorials from Our YouTube Channel
Original tutorials from the MegaCalcOnline YouTube channel. Links open YouTube; nothing loads from YouTube until you click.
30-Minute Walk: How Many Calories Do You REALLY Burn? 🔥 | Walking Calculator
Watch the walkthrough, then try the calculator yourself.
Watch on YouTube ↗Walking Calories Calculator →30-Min Run = How Many Calories? 🏃🔥 | What REALLY Changes Your Calorie Burn?
Watch the walkthrough, then try the calculator yourself.
Watch on YouTube ↗Running Calories Calculator →Walking vs Running: Which Burns More Calories in 30 Minutes?
Watch the walkthrough, then try the calculator yourself.
Watch on YouTube ↗Calories Burned Calculator →Why MegaCalcOnline.com?
MegaCalcOnline.com is built for Australians: metric units, Australian dollars, and Australian rules where they apply (for example ATO tax rates, super guarantee rules and state stamp duty). Calculators are general-information tools — not financial, tax, legal or medical advice.
🇦🇺 Australian-Focused
Tax calculators use ATO rates for the financial year shown on the page. Super calculators use the 12% super guarantee rate. Mortgage calculators use Australian terms such as stamp duty and LMI. Health calculators use metric units, show their formulas, and give estimates only.
📅 Financial-Year Labels
Verified 2026–27 figures (resident tax rates, super contribution caps, HELP thresholds and Medicare levy surcharge thresholds) are used where noted on the page, and older guides stay labelled for 2025–26. We have not re-checked every calculator for 2026–27, so please confirm the year shown on each page.
💡 Free & No Login Required
All 600+ calculators and tools are free. No registration and no email required to use them.
Free Australian Calculators and Tools
MegaCalcOnline.com gives every Australian access to free calculator tools and financial guides — with financial-year labels on each page, including verified 2026–27 information where noted.
Australian Tax Calculators
Estimate your take-home pay using ATO tax brackets for 2026–27 (2025–26 is also available). Our income tax calculator handles Medicare levy, LITO offset, salary sacrifice, and HECS-HELP repayments — all updated after the Stage 3 tax cuts and the July 2025 HECS reforms. Used by employees, contractors, and small business owners across Australia.
Mortgage & Property Tools
From borrowing power (with the APRA 3% serviceability buffer) to stamp duty across all 8 Australian states and territories — our mortgage calculators let you enter your own interest rate and use Australian terms such as stamp duty and LMI. Whether you are a first home buyer, refinancing, or comparing investment property returns, we have the tool you need.
Superannuation Calculators
Australia's retirement system is among the most complex in the world. Our super calculators cover contribution caps (2026–27: $32,500 concessional; 2025–26: $30,000), salary sacrifice tax savings, Division 293 tax, transition-to-retirement strategies, and projected retirement balances. Check each page for the financial year it uses.
Why Australians Use MegaCalcOnline.com
How to Use MegaCalcOnline.com
Use the navigation menu above to browse calculator categories, or use the search bar at the top to find any specific calculator by name. The most commonly used calculators are linked in the Popular bar below the header — income tax, salary, mortgage, CGT, BMI, and super contributions.
Each calculator page includes a step-by-step "How to Use" guide, worked examples using realistic Australian figures, and a Frequently Asked Questions section covering the most common queries around that topic. Our Blog contains 140+ guides and articles covering Australian tax, mortgages, superannuation and health, with official sources linked where they are cited.
Calculator results are estimates for guidance purposes. For decisions involving significant money — property purchases, superannuation strategies, tax lodgement — always confirm with a qualified professional such as a registered tax agent or licensed financial adviser.
Popular Calculators
📢 About MegaCalcOnline.com
MegaCalcOnline.com is operated by SM Services Pty Ltd, a Melbourne-based Australian business. All calculators and content are provided for general information only and do not constitute financial, tax, legal, or medical advice. Always consult a qualified professional before making financial decisions. Learn more about us →
Published by MegaCalcOnline.com · Last updated 10 October 2026
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