Sales tax calculator
The general case. Enter whatever combined rate applies where you are.
%
Total with tax
108.25
- Tax
- 8.25
- Net price from a gross price
- 100.00
- Tax inside the gross price
- 8.25
- Gross-up multiplier
- 1.082 500
- Net-down divisor
- 0.923 788
Show the working
- Price before tax = 100
- Tax rate = 8.25
- Price including tax = 108.25
- Tax = 100 * 8.25 / 100 = 8.25
- Total with tax = 100 + 8.25 = 108.25
- Net price from a gross price = 108.25 / (1 + 8.25/100) = 100
- Tax inside the gross price = 108.25 - 100 = 8.25
- Gross-up multiplier = 1 + 8.25/100 = 1.0825
- Net-down divisor = 1.0825 != 0 ? 1/1.0825 : 0 = 0.923 788
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- total = price x (1 + rate)
- net = gross / (1 + rate)