About OneCalculate

OneCalculate is a free calculator hub, built to answer one narrow question well: what does a rule, rate or formula actually mean for your numbers, right now. We started with Australia — contractor pay, ATO tax brackets, GST, and the maths that homebrewers and tradies actually search for — and we're building it out category by category.

What we are

A tool, not an advisor. Every calculator on this site does one job: take your inputs, apply a real, sourced formula, and show you the number instantly, with no sign up and no submit button. We are not a financial planning service, an accountant, or a law firm, and nothing on this site is personal advice — see our disclaimer.

Why we built it

Official numbers — tax brackets, award rates, duty schedules — are public, but they live scattered across PDFs, calculators buried three clicks deep on government sites, and forum threads with numbers three years out of date. We turn them into fast, mobile-friendly tools, and we keep the rates current so you're not doing 2024 maths in 2026.

How we make money

OneCalculate is free to use and always will be. Once the site carries enough content to apply for Google AdSense, some pages will show a small number of clearly-marked ads — never above the calculator, never more than three per page. Where it's genuinely useful, some pages may also link to relevant products or services through affiliate partnerships; we only do this where the link fits what you were already trying to work out. You can read the specifics in our editorial policy.

Who's behind it

OneCalculate is built and maintained by Nirbhay Tripathi. Nirbhay Tripathi has spent 10+ years working in data, automation and marketing systems. He built OneCalculate to turn official Australian rates and formulas — ATO tax brackets, Fair Work award rules, state duty schedules — into calculators people can actually use, instead of leaving them buried in PDFs.

Get in touch

Found a rate that's out of date, or a calculator that doesn't match your situation? Tell us — seecontact.