Every calculator
that answers in numbers

Calculators are grouped by category — payroll and tax, finance, property, then dates, health, study, plain arithmetic and unit conversion. Once you know the group, click a card heading to open its full list; if you are still unsure, just read down the names laid out inside each card and pick one.

Where the rules get revised often, the screen names the year it applies to and the source it follows, so glance at that line before copying a figure anywhere. To carry a number straight into another calculation, follow the "continue calculating" prompt beside the result instead of typing it again.

It is not always obvious which area a calculation belongs to. Take-home pay sits under tax and payroll, loan repayments under finance, acquisition tax under property — the same money question lands in different places, so the search at the top is quicker when the name escapes you.

Some topics carry more than one calculation. Deriving take-home pay from an annual salary differs in purpose from converting weekly or hourly rates, so they are kept apart, and severance pay and severance income tax are likewise separate steps.

Where a calculation uses policy figures, the reference year changes the result. Rates, deduction limits, contribution rates and the minimum wage are revised annually, so checking a past amount means using the historical basis for that year.

Results show the basis used alongside the figure, so the statutes and notices applied can be checked and an unexpected amount traced to the item that differed.

Inputs are processed inside the browser and not transmitted. Sensitive figures such as salary and assets stay on the device, and no calculation history is stored.

Results are estimates for reference. Actual amounts payable or receivable depend on individual circumstances and the latest revisions, so anything requiring certainty — a filing, a contract — is safer confirmed against the competent authority's calculation and professional advice.

Bookmarking the calculations you use often saves finding them again, and adding one to the home screen opens it like an app.

Input fields carry slightly different meanings between calculators. The same annual salary gives a different result depending on whether non-taxable allowances are included, so reading the note under each field first saves recalculating.

Where a result needs sharing, some calculators encode the inputs into the address bar so the other person opens the same conditions directly, without the figures being read out again.