About GlobalCalc

Free financial calculators for Australia, the UK, and the United States  ·  Last updated: 13 April 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

220+ financial 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-first. Every calculation runs entirely in your browser. Your income, loan amounts, and other financial inputs never leave your device. We do not require accounts, do not store your figures, and do not use tracking cookies. 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 is supported by display advertising. Ads are served by Google Ad Manager and other ad networks, and appear in dedicated slots marked "Advertisement". We never sell user data, never embed tracking pixels in calculator results, and never use your financial inputs for targeting.

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.