Sales Tax Calculator

What is a sales tax calculator?

A sales tax calculator takes a pre-tax price and a tax rate and instantly returns the sales tax amount and the final total you pay. Type in what an item costs before tax, enter your combined state and local rate, and the tool shows both the dollar amount of tax added and the grand total at checkout.

Sales tax in the United States is a percentage added on top of the listed price at the point of sale. Rates vary by state, county and city, so the same item can cost different totals in different places. This tool stays accurate everywhere because you supply the exact rate for your location.

How is sales tax calculated?

The calculator uses two simple steps:

• tax = price × rate / 100
• total = price + tax

Here price is the pre-tax (sticker) amount, rate is the sales tax percentage, and tax is the dollar amount added. The total is simply the price plus that tax. Results are rounded to two decimal places (the nearest cent), which is how stores bill you.

Because the rate is divided by 100, a rate of 8.25 means 8.25 percent. Enter the number as a percent, not a decimal — type 7, not 0.07.

Examples

Each example follows the same formula: tax = price × rate ÷ 100, then total = price + tax.

Example 1 — a $49.99 item at 8.25%.

1. tax = 49.99 × 8.25 ÷ 100 = $4.12
2. total = 49.99 + 4.12 = $54.11

So a $49.99 product in a jurisdiction with an 8.25% rate costs $54.11 at the register.

Example 2 — $100 at 7%.

1. tax = 100 × 7 ÷ 100 = $7.00
2. total = 100 + 7.00 = $107.00

A flat $100 purchase at a 7% rate adds exactly $7.00 of tax for a $107.00 total.

Example 3 — a $250 order at 6%.

1. tax = 250 × 6 ÷ 100 = $15.00
2. total = 250 + 15.00 = $265.00

The $250 order picks up $15.00 in sales tax, bringing the total to $265.00.

Sales tax reference table

The table shows the tax and total this calculator produces on a $100 pre-tax price at several common rates, so you can sanity-check the output for your own rate.

Tax rate	Tax on $100	Total (price + tax)
4%	$4.00	$104.00
6%	$6.00	$106.00
7%	$7.00	$107.00
8.25%	$8.25	$108.25
9.5%	$9.50	$109.50
10%	$10.00	$110.00

To scale any of these to a different price, multiply proportionally — at 7%, a $200 order is simply double the $100 row, giving $14.00 tax and a $214.00 total.

Common uses

• Shopping budgets: know the real out-the-door cost before you reach the register, not just the shelf price.
• Invoicing and quotes: add the correct tax line to a customer’s bill so the total matches what you collect.
• Expense tracking: separate the tax portion from a purchase for bookkeeping or reimbursement.
• Comparing locations: see how a different combined rate changes the total on a big-ticket buy such as electronics or furniture.
• Online checkout estimates: estimate tax before a store applies it, since many retailers only show it on the final page.

Tips and common mistakes

• Enter the combined rate. Add state, county, city and special-district rates into one percentage before typing it in. Using only the state rate undercounts the tax.
• Type a percent, not a decimal. Enter 8.25, not 0.0825. A decimal would make the tax almost nothing.
• Apply discounts first. Tax is usually charged on the post-discount price, so reduce the price before calculating tax.
• Expect cent-level rounding. A multi-item receipt may differ by a cent because each line or the final tax is rounded separately.
• Check what is taxable. Some states exempt groceries, prescription drugs or clothing, so the taxable base may be less than the full order.

Limitations and notes

This tool performs the standard add-sales-tax arithmetic and rounds to the nearest cent. It does not look up rates for you, so you must supply the correct combined rate for your address — rates change and vary by ZIP code and even by product category. It also does not handle tax-exempt items, partial exemptions, tax holidays, shipping taxability rules, or use tax on out-of-state purchases. For official filings or pricing decisions, confirm the current rate with your state department of revenue or a qualified tax professional. This page is for general information only and is not tax advice.

For related money math, the reverse sales tax calculator strips an embedded tax out of a tax-included total, the GST calculator handles value-added tax for countries that use GST, and you can browse more options in the tax calculators category.