Tax and pricing calculators

VAT, sales tax, margin, discounts and proration. Every one of them shows the formula it used and the steps it took.

What is in this aisle

VAT calculator, Sales tax calculator, Reverse VAT calculator, Discount calculator, Margin and markup calculator, Proration calculator, Volume discount calculator. Each has its own page with a worked example, the expression it evaluates, and the mistake people most often make with it.

Questions

Why do you show the formula?

Because a number with no working is something you have to trust rather than something you can check. Showing the formula and the steps also answers the question sitting next to the calculation — people search for how to calculate a thing at least as often as they search for a tool that does it.

Will you add more calculators?

Yes, chosen by what people actually search for. The limit is deliberate: sixty calculators that are each genuinely correct and show their working will outrank three hundred thin ones, and will not put the whole domain at risk.