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Calculate sales tax, total cost with tax, or find the pre-tax amount. Works for any tax rate.
Note: Local taxes may apply on top of state rates
Enter amount and tax rate to calculate
Example: $50 item with 8% tax = $50 × 0.08 = $4 tax → Total = $54
Example: $50 with 8% tax = $50 × 1.08 = $54 (same result, one step)
Example: Total is $54 with 8% tax → $54 / 1.08 = $50 base price
When removing tax, you cannot simply subtract the percentage. You must divide by (1 + tax rate). Example: $108 with 8% tax is NOT $108 - $8.64. It's $108 / 1.08 = $100.
| Base Price | Tax Rate | Tax Amount | Total Price |
|---|---|---|---|
| $100.00 | 5% | $5.00 | $105.00 |
| $100.00 | 6% | $6.00 | $106.00 |
| $100.00 | 7% | $7.00 | $107.00 |
| $100.00 | 8% | $8.00 | $108.00 |
| $100.00 | 10% | $10.00 | $110.00 |
| $250.00 | 8.5% | $21.25 | $271.25 |
| $500.00 | 7.25% | $36.25 | $536.25 |
| $1000.00 | 6.5% | $65.00 | $1065.00 |
Multiply the price by the tax rate (as a decimal). For example, 8% tax on $50 = $50 × 0.08 = $4. Add this to the original price: $50 + $4 = $54 total.
Divide the total by (1 + tax rate). For example, if total is $108 with 8% tax: $108 / 1.08 = $100 pre-tax price. You cannot just subtract 8% from $108.
If you know the tax amount and base price: Tax Rate% = (Tax Amount / Base Price) × 100. For example, $6 tax on $100 = 6%.
Always calculate discount first, then apply tax to the discounted price. Example: $100 item with 20% off and 8% tax = $100 × 0.80 = $80, then $80 × 1.08 = $86.40.
Add the percentages together for the total rate. For example, if state tax is 6% and local is 2.5%, use 8.5% total rate. The calculation is the same - just use the combined rate.
Tax percentages apply to different base amounts. 8% of $100 is $8 (total $108), but 8% of $108 is $8.64, not $8. To remove tax correctly, divide by (1 + rate), don't subtract.
Add all item prices first to get the subtotal, then calculate tax on the subtotal. Example: $20 + $30 + $50 = $100 subtotal, then $100 × 1.07 = $107 total with 7% tax.
Sales tax is added at final sale (US system), while VAT is included in displayed prices (most other countries). The calculation is similar, but VAT-inclusive prices show the total immediately.