xearno.tools

55 calculators

Put a calculator on your own page

One line of HTML. It keeps working as the rules change, because we maintain the figures behind it — the same tools we publish here, not a stripped-down version.

The deal, both ways

You get a maintained calculator with no ads, no cookies and no tracking of your readers. We get one visible credit link under it. That link is the whole reason this is free, so it stays crawlable and we will not pretend otherwise.

Earning & Work

Loans & Debt

Saving & Investing

Everyday Money

Running a Business

  • Hong Kong profits tax at 8.25%/16.5% for corporations or 7.5%/15% for unincorporated businesses, with the connected-entity election.

  • How much you’ll owe on 2026 freelance income — SE tax, income tax, QBI — and the exact quarterly payment the safe-harbor rules actually require.

  • Your real first-January Self Assessment bill — the year’s tax PLUS 50% of next year’s, due the same day — with the exact dated payment schedule.

  • What your app or game actually nets after Apple’s, Google’s, or Valve’s cut — including the 30 Jun 2026 Google Play restructure no AI model has memorized.

  • LTV, LTV:CAC, and CAC payback — with the benchmarks that make them mean something.

  • Units and revenue needed to cover costs — and how much pricing moves it.

  • How many months of cash remain, and when to start raising.

  • Is this investment worth it — discounted, not vibes.

  • Margin vs markup, and what a discount really costs in volume.

  • Bottom-up market sizing with a built-in plausibility check.

  • Return on investment, simple and annualized — comparable numbers instead of raw bragging.

  • Add or remove VAT at any rate — including the divide-not-subtract trap.

  • Add or extract GST — India slabs (5/12/18/28), Australia/NZ/Singapore/Canada rates.

Frames are English for now. If you need another language, or a size or field set we do not offer, say so — we would rather add a knob a real publisher asked for than guess at ten.