Hub Maths

Free maths and finance calculators

7 free maths tools that run in your browser. No account, no uploads, no watermarks.

Straightforward calculators that show their working, so you can check the result rather than trust it. Everything is computed in the page, instantly, with no ads interrupting the answer.

All 7 maths tools

Loan & Mortgage Calculator Calculate monthly repayments, total interest, and view a year-by-year amortisation schedule. Supports extra monthly payments. Age Calculator Enter your date of birth to get your exact age in years, months, days, weeks, and hours — plus days until your next birthday. BMI Calculator Calculate your Body Mass Index in metric (kg/cm) or imperial (lbs/ft). See category badge, healthy weight range, and a visual scale. Compound Interest Calculator See how savings grow with compound interest and monthly contributions. Includes year-by-year growth table. Date Difference Calculator Find the exact number of days, weeks, months, and years between two dates — with weekday vs weekend breakdown. Number to Words Convert any number to English words instantly. Supports cardinal, ordinal, and currency formats for cheques and formal documents. Percentage Calculator Three modes: find X% of Y, find what percentage X is of Y, or calculate percentage change between two values.

How to use these tools

  1. Pick the tool you need from the list above — each one opens on its own page.
  2. Add your file or type your input. Nothing is uploaded; the work happens on your device.
  3. Adjust the options until the preview looks right.
  4. Download or copy the result. There is no watermark and no sign-up.

Frequently asked questions

Are these accurate enough for financial decisions?

The arithmetic is exact, but the assumptions are yours. Use them to model and compare, then confirm with your lender or accountant before committing to anything.

Is my data saved?

No. The numbers you type stay in the page and are gone when you close the tab.

Do they work on a phone?

Yes. Every calculator is laid out for a phone screen as well as a desktop.

Can I see how a result was worked out?

Most calculators show the breakdown alongside the answer rather than only the final figure.

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