Sales Tax Calculator
Sales tax is added at the register, not printed on the shelf, so the price you see is rarely the price you pay. This sales tax calculator adds your local rate to a subtotal and shows both the tax and the grand total. Use it to budget before you shop, check a receipt, or compare a purchase across two areas with different rates — but treat the result as an estimate, because the exact rate depends on where the sale takes place and what is being bought.
Calculate
Default result: $54.00
Sales Tax Calculator · Materials
calculators.dev
Total with tax
50 × 8
Shopping list
- Tax amount
- $4.00
Est. total
$54.00
Estimate — confirm w/ supplier · calculators.dev
Tax rates vary by location and change over time — confirm your local rate. This is an estimate, not tax advice.
Reviewed by the calculators.dev team · Last updated 2026-06-23
How to calculate
Enter the pre-tax subtotal, then your sales-tax rate as a percentage. The calculator multiplies the subtotal by the rate to get the tax, then adds it back to the subtotal for the total. A $50 subtotal at 8% adds $4 in tax for a $54 total. If you are not sure of your rate, check a recent receipt — the effective rate is the tax line divided by the subtotal. The figures update as you type so you can try a few rates.
tax = subtotal × (rate ÷ 100), then total = subtotal + tax. The rate is the combined sales-tax percentage for the location, which may bundle a state rate with county and city rates. Some goods (such as groceries or medicine in many places) are taxed at a reduced rate or not at all, which this single-rate calculator does not model.
Example calculation
A $50 subtotal at an 8% sales-tax rate adds $4 in tax (50 × 0.08), for a grand total of $54. The rate shown here is an example — your local combined rate may differ.
- total
- $54.00
- taxAmount
- $4.00
Assumptions
- A single combined rate is applied to the whole subtotal — it does not handle tax-exempt items or split rates within one purchase.
- Rates are set by state and local governments and change over time, so the figure you enter must come from a current local source.
- The result is an estimate for planning, not an official tax computation; the amount on your receipt is authoritative.
Common mistakes
- Using only the state rate and missing the county or city portion, which understates the tax in many areas.
- Applying tax to items that are exempt or reduced-rate, such as unprepared food in some jurisdictions, which overstates the total.
- Entering the rate as a decimal (0.08) in the percent field instead of as a percentage (8), which makes the tax a hundred times too small.
Frequently asked questions
How do I calculate sales tax on a purchase?
Multiply the subtotal by the tax rate as a decimal. For an 8% rate on $50, that is 50 × 0.08 = $4 of tax, for a $54 total.
What sales-tax rate should I use?
Use the combined rate for the location of the sale — often a state rate plus county and city additions. Your latest receipt or your state's revenue website is the reliable source.
Is sales tax charged on the price after a discount?
Usually yes — tax is generally applied to the discounted price you actually pay. Calculate the sale price first, then add tax to that amount.
Why is this an estimate and not tax advice?
Rates vary by location and over time, and some goods are exempt or taxed at a special rate, so the exact tax depends on rules this single-rate tool does not capture. Treat the result as a planning estimate.