Free Australian Calculators — Pay, GST, Loan, Discount & More

Calculator Tools Australia is a free browser-based toolbox of 45+ Australian-friendly calculators and everyday utilities. Estimate your take-home pay under the current 2026-27 ATO tax brackets (with the new 15% second-bracket rate and 12% Super Guarantee), add or remove 10% GST, work out a loan or mortgage in AUD, convert an hourly rate into weekly or annual pay, calculate a Boxing Day discount, check your age to the day, or split an EOFY invoice — every tool built specifically for Australian tax rules, currency, and consumer habits.

Beyond calculators we also cover text (word counter, grammar checker, paraphraser, summariser, keyword density), image (compressor, resizer, format converters, background remover, OCR), PDF (merge, split, compress, convert, watermark, eSign), and security (password generator, strength checker, random string). Every single tool runs entirely on your device using JavaScript and WebAssembly — no upload, no sign-up, no tracking, no data ever leaves your browser. That means sensitive files like payslips, tax statements, contracts, medical records and personal photos never touch a remote server.

The calculators are updated for the current financial year and cite ATO published rates. The 2026-27 pay calculator supports all six pay frequencies (annual, monthly, fortnightly, weekly, daily, hourly), the new marginal HECS/HELP repayment system, LITO, Medicare Levy phase-in, resident and working-holiday tax rules, and includes historical rates back to 2022-23. No account required — bookmark this page and use it every time you need a quick answer.