How do I find price before tax?

Price before tax = Total / (1 + Tax rate / 100). Tax amount = Total − Price before tax.

Online Reverse Sales Tax Calculator

Find price before tax from a total that includes sales tax. Enter total and tax rate.

Total (incl. tax) ($)

Sales tax rate (%)

How do I find price before tax?: Price before tax = Total / (1 + Tax rate / 100). Tax amount = Total − Price before tax.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

Tip Calculator

Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

Combinations Calculator

Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

Even Permutations Calculator

Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.