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Sales Tax Calculator
Add sales tax to a price or work backwards from a total to find the pre-tax amount and the tax paid.
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%
Total with tax
$108.00
Price before tax$100.00
Sales tax$8.00
Total with tax$108.00
What this does
Enter a price and a tax rate to see the sales tax and the final total. Switch to reverse mode to start from a tax-inclusive total and find the original pre-tax price and the tax portion — useful for receipts and bookkeeping.
How to use it
- 1Enter the amount (pre-tax price, or a tax-inclusive total in reverse mode).
- 2Enter the sales tax rate as a percentage.
- 3Read the tax amount and the total, or the pre-tax price in reverse mode.
Examples
- $100 at 8% tax = $8 tax, $108 total
- Reverse: $108 total at 8% = $100 before tax
Frequently asked questions
- How do I add sales tax to a price?
- Multiply the price by the tax rate to get the tax, then add it. $100 × 8% = $8 tax, for a $108 total. The calculator does this instantly.
- How do I calculate the pre-tax price from a total?
- Divide the tax-inclusive total by 1 plus the tax rate. $108 ÷ 1.08 = $100 before tax. Reverse mode does this for you and shows the tax portion.
- Does this work for VAT and GST?
- Yes. The math is the same for any single-rate sales tax, VAT or GST — just enter your local rate.