Sales Tax Calculator
Calculate sales tax on any purchase, find total price with tax included, or reverse-calculate the pre-tax price from a grand total amount.
Sales tax is a percentage-based tax added to the price of goods and services at the point of sale. In the United States, it is set at the state and local level — there is no federal sales tax.
Add-on sales tax formula (calculating tax on top of price): Tax Amount = Pre-Tax Price × (Tax Rate ÷ 100) Total Price = Pre-Tax Price × (1 + Tax Rate ÷ 100)
Back-calculating pre-tax price from a total: Pre-Tax Price = Total Price ÷ (1 + Tax Rate ÷ 100) Tax Amount = Total Price − Pre-Tax Price
Worked examples:
Example 1 — Adding tax: Item costs $85.00. State tax rate is 7.5%. Tax = $85.00 × 0.075 = $6.375 → $6.38 (rounded) Total = $85.00 + $6.38 = $91.38
Example 2 — Extracting tax from a receipt total: You paid $107.00 total. Tax rate was 7%. Pre-Tax = $107.00 ÷ 1.07 = $100.00 Tax Paid = $107.00 − $100.00 = $7.00
US state sales tax rates (2024, state-level only):
- No sales tax: Oregon, Montana, New Hampshire, Delaware, Alaska
- Lowest: Colorado (2.9%), Hawaii (4%)
- Highest: California (7.25%), Indiana, Mississippi, Rhode Island (7%)
- Tennessee and Louisiana add high local taxes bringing combined rates to 9–10%
Combined rate: Combined Rate = State Rate + County Rate + City Rate Most Americans pay a combined rate between 6% and 10%.
Taxable vs. non-taxable items: Most states exempt groceries, prescription drugs, and medical equipment from sales tax — though definitions vary by state.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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