What is the Reverse Sales Tax Calculator?
Back out the pre-tax price and tax portion from a total that already includes sales tax. Quick, everyday math — splitting the bill, checking a sale, comparing prices at the store or scaling a recipe — shouldn’t need a spreadsheet. These calculators answer it in a second.
How to use the Reverse Sales Tax Calculator
- Enter your total paid, your sales tax rate.
- Results update automatically as you type; you can also press Calculate.
- Read the output: price before tax, tax included.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With total paid = $108.25, sales tax rate = 8.25 %, the Reverse Sales Tax Calculator returns price before tax: $100.00; tax included: $8.25.
Tips for better results
- Stacked discounts multiply rather than add: 30% + 20% off is 44% off, not 50%.
- Compare unit prices, not package prices, to find the real deal.
- Bookmark the tools you use often — every page works offline once loaded.
Frequently asked questions
What does the Reverse Sales Tax Calculator do?
Back out the pre-tax price and tax portion from a total that already includes sales tax.
How is it calculated?
The Reverse Sales Tax Calculator uses this method: Pre-tax = Total ÷ (1 + rate).
Can you show an example?
With total paid = $108.25, sales tax rate = 8.25 %, the Reverse Sales Tax Calculator returns price before tax: $100.00; tax included: $8.25.
Is the Reverse Sales Tax Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Reverse Sales Tax Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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