About GlobalCalc

Free calculators for Australia, the UK, and the United States  ·  Last updated: 30 July 2026

Contents
  1. Our mission
  2. What we build
  3. Our principles
  4. How we stay accurate
  5. How we make money
  6. Contact

Our mission

GlobalCalc exists to make financial decisions less stressful. Buying a home, calculating take-home pay, working out a super projection — these are moments that shape a life, and the tools available online are too often confusing, paywalled, or riddled with tracking.

We build the calculators we wanted to use ourselves: free, instant, accurate to current official rates, and honest about their limitations.

What we build

4800+ calculators across three markets:

  • Australia — ATO income tax, PAYG, HECS, stamp duty (NSW/VIC/QLD/ACT/SA), super contributions, borrowing capacity, CGT, negative gearing, Medicare levy surcharge, and more.
  • United Kingdom — PAYE income tax, NI, stamp duty (SDLT), pension, ISA, inheritance tax, capital gains tax, mortgage, and more.
  • United States — federal income tax, FICA, 401(k), mortgage, capital gains tax, paycheck, and more.

Calculators are organised into 9 categories: Property, Tax, Income, Savings, Super / Pension / Retirement, Debt, Business, Living Costs, and Health.

Our principles

  • Privacy-aware. Calculator arithmetic runs in your browser, no account is required, and GlobalCalc does not store your figures as calculator records. Google Analytics remains off unless you explicitly allow it. Google advertising services and Microsoft Clarity are currently disabled pending verified compliance and legal approval. See our Privacy Policy for full details.
  • Free, always. No paywalls, no "unlock premium features" buttons, no account required. The full calculator — including advanced precision levels and sensitivity analysis — is available to every visitor.
  • Accurate. We track official rate changes from the ATO, HMRC, and IRS, and update calculators as thresholds and rates shift. Every calculator links to the underlying formula and cites its sources.
  • Transparent. Every calculator includes a formula panel showing the exact maths used. No black boxes. If you don't trust a result, you can reproduce it by hand.

How we stay accurate

Tax rates, thresholds, and contribution caps change every year — sometimes more often. We maintain an internal calendar of known official update dates (1 July for AU, 6 April for UK, January for US) and review each calculator against the latest published rates when new figures are released.

Each calculator includes:

  • The tax year or financial year it applies to, stated clearly on the page.
  • A "Last updated" date in the page metadata.
  • A link to the authoritative source (ATO, HMRC, IRS, RBA, BoE, Fed) where relevant.
  • A formula panel you can open to verify the calculation.

That said — calculators are estimates. They cannot account for your full personal circumstances, and they are not a substitute for professional advice. See our Disclaimer.

How we make money

GlobalCalc intends to be supported by clearly labelled sponsorship and display advertising, but Google advertising technology and postcode-based local sponsorship are currently disabled pending verified compliance, suitable sponsor inventory and legal approval. During this containment period, paid-ad revenue is unavailable and advertising spaces can show first-party recommendations for other GlobalCalc calculators. We do not use the figures entered into a calculator to choose those house recommendations. If a local-sponsor preference is introduced, it will be separate from analytics and optional.

If you'd prefer to support us directly, the best thing you can do is share a calculator that helped you.

Contact

Found a bug, spotted an outdated rate, or have a calculator you'd like us to build?

Email: hello@globalcalc.net

Or use the contact form.