How do I find the pre-tax price from a receipt total?

Switch to "Extract tax from total" and enter the total you paid along with the tax rate. The tool divides the total by (1 + rate ÷ 100) to back out the original pre-tax price — simply subtracting the percentage from the total would give the wrong answer.

Why can't I just subtract the tax percentage from the total?

Tax is calculated on the pre-tax price, not on the total. If an item is $100 with 10% tax, the total is $110 — but 10% of $110 is $11, not the $10 of actual tax, so subtracting straight from the total overstates the tax.

Where do I find my local sales tax rate?

Sales tax rates vary by country, state/province, and sometimes city or county — check your local tax authority's website for the combined rate that applies to your purchase location.

Is my financial data sent anywhere?

No. All math runs locally in your browser — nothing is transmitted or stored.

SALES TAX CALCULATOR

Add tax to a price, or extract it from a total. Nothing leaves your browser.

Price before tax

Sales tax rate (%)

Pre-tax price100.00

Sales tax8.25

Total108.25

How to calculate sales tax

1
Choose whether you're adding tax to a price or extracting tax from a total.
2
Enter the amount and the sales tax rate as a percentage.
3
Read the pre-tax price, the tax amount, and the total.

Questions

How do I find the pre-tax price from a receipt total?: Switch to "Extract tax from total" and enter the total you paid along with the tax rate. The tool divides the total by (1 + rate ÷ 100) to back out the original pre-tax price — simply subtracting the percentage from the total would give the wrong answer.
Why can't I just subtract the tax percentage from the total?: Tax is calculated on the pre-tax price, not on the total. If an item is $100 with 10% tax, the total is $110 — but 10% of $110 is $11, not the $10 of actual tax, so subtracting straight from the total overstates the tax.
Where do I find my local sales tax rate?: Sales tax rates vary by country, state/province, and sometimes city or county — check your local tax authority's website for the combined rate that applies to your purchase location.
Is my financial data sent anywhere?: No. All math runs locally in your browser — nothing is transmitted or stored.