Sales Tax Calculator - Free Online Tool

Calculate sales tax instantly — add tax, extract tax from totals, and compute tax for multiple items

Welcome to our free Sales Tax Calculator, the fastest way to calculate sales tax for any purchase in the United States. Whether you are a consumer trying to estimate the final cost of a purchase, a small business owner calculating tax for invoices, or a freelancer figuring out how much to charge, this calculator handles it all. Sales tax is a consumption tax imposed by state and local governments on the sale of goods and certain services. In the United States, sales tax rates vary widely by state, county, and city. There is no federal sales tax, so each state sets its own rate. Five states — Alaska, Delaware, Montana, New Hampshire, and Oregon — do not charge state-level sales tax, though some localities within Alaska do. Our Sales Tax Calculator supports three modes of operation. In "Add Tax" mode, you enter the price before tax and the tax rate, and the calculator shows you the tax amount and the final price including tax. In "Extract Tax" mode (also called reverse sales tax calculation), you enter the total price you paid and the tax rate, and the calculator determines the original pre-tax price and the tax portion. In "Find Rate" mode, you enter the price before tax and the total price after tax, and the calculator determines the tax rate that was applied — perfect for verifying receipts or comparing rates across stores. The calculator includes a searchable quick-select grid with tax rates for all 50 US states plus the District of Columbia. States with no sales tax (Alaska, Delaware, Montana, New Hampshire, and Oregon) are highlighted in green for easy identification. The multi-item feature is especially useful for business owners and event planners who need to calculate sales tax on multiple products with different prices. Simply add each item, and the calculator totals everything for you. All calculations happen instantly in your browser. No personal data is sent to any server, ensuring your complete privacy. The calculator works on all devices, including smartphones, tablets, and desktop computers, making it perfect for quick calculations while shopping or at the checkout counter. Understanding sales tax is essential for budgeting and financial planning. When comparing prices across state lines or shopping online, knowing the applicable sales tax rate helps you make informed purchasing decisions. Our searchable state rate grid makes it easy to find the rate you need without looking it up separately.

Understanding Sales Tax

Sales tax is a percentage-based tax added to the purchase price of taxable goods and services. It is collected by the seller at the point of sale and remitted to the state and local government.

How Sales Tax Works

Sales tax is calculated as a percentage of the pre-tax price. For example, if an item costs $100 and the sales tax rate is 8%, the tax amount is $8, making the total $108. The seller collects the tax and sends it to the government.

US State Sales Tax Rates

Sales tax rates in the US range from 0% (in states like Oregon and Delaware) to over 10% when state and local rates are combined. The average combined state and local rate is approximately 6.6%. Rates can also vary by product type — groceries and prescription drugs are exempt in many states.

Sales Tax Formulas

Tax Amount

Tax = Price × (Rate ÷ 100)

Calculates the sales tax by multiplying the pre-tax price by the tax rate expressed as a decimal. For example, 8% tax on $100 = $100 × 0.08 = $8.00.

Total Price (Tax Inclusive)

Total = Price × (1 + Rate ÷ 100)

Calculates the final price including sales tax in a single step. Equivalent to adding the tax amount to the original price.

Pre-Tax Price (Reverse Calculation)

Price = Total ÷ (1 + Rate ÷ 100)

Extracts the original pre-tax price from a total that already includes sales tax. Useful for verifying receipts or determining the base price from a tax-inclusive total.

Find Tax Rate

Rate = ((Total − Price) ÷ Price) × 100

Determines the sales tax rate when you know both the pre-tax price and the total price paid. Useful for verifying the tax rate applied on a receipt.

Reference Tables

US State Sales Tax Rates (Highest and No-Tax States)

The 10 states with the highest base state sales tax rates, plus the 5 states with no state sales tax. Note: combined rates (state + local) can be significantly higher.

State	State Rate	Avg. Combined Rate	Notes
California	7.25%	8.68%	Highest base state rate in the US
Indiana	7.00%	7.00%	No local taxes — uniform statewide
Mississippi	7.00%	7.07%	Groceries taxed at full rate
Rhode Island	7.00%	7.00%	No local taxes
Tennessee	7.00%	9.55%	High local rates push combined average up
Minnesota	6.875%	7.49%	Clothing is exempt
Nevada	6.85%	8.23%	Tourism areas have higher combined rates
New Jersey	6.625%	6.60%	No local taxes on most items
Arkansas	6.50%	9.44%	Very high local surtaxes common
Washington	6.50%	9.29%	No income tax — relies heavily on sales tax
Alaska	0.00%	1.76%	No state tax, but some localities charge tax
Delaware	0.00%	0.00%	No sales tax at any level
Montana	0.00%	0.00%	No sales tax at any level
New Hampshire	0.00%	0.00%	No sales tax at any level
Oregon	0.00%	0.00%	No sales tax at any level

Worked Examples

Calculate Sales Tax on a $299 Purchase in California

Item price: $299.00, California state sales tax rate: 7.25%.

Convert the rate to a decimal: 7.25% ÷ 100 = 0.0725

Calculate tax: $299.00 × 0.0725 = $21.6775

Round to the nearest cent: $21.68

Calculate total: $299.00 + $21.68 = $320.68

The sales tax is $21.68, making the total price $320.68. Note: if your local combined rate is higher (e.g., 9.5% in Los Angeles), the tax would be $28.41 for a total of $327.41.

Reverse Calculate Pre-Tax Price from a $53.50 Total

Total paid: $53.50, known sales tax rate: 8%.

Use the reverse formula: Price = Total ÷ (1 + Rate ÷ 100)

Price = $53.50 ÷ (1 + 0.08)

Price = $53.50 ÷ 1.08

Price = $49.537...

Round to nearest cent: $49.54

Verify: Tax = $53.50 − $49.54 = $3.96

Check: $49.54 × 0.08 = $3.96 ✓

The pre-tax price was $49.54 and the sales tax portion was $3.96.

How to Use the Sales Tax Calculator

Choose Your Calculation Mode

Select 'Add Tax' if you know the pre-tax price and want to find the total. Select 'Extract Tax' if you know the final amount and want to find how much was tax. Select 'Find Rate' if you know both prices and want to determine the tax rate.

Enter the Price and Tax Rate

Type in the item price (or total price in extract mode). Then enter the sales tax rate, or click one of the US state buttons to auto-fill a common state rate like California (7.25%) or Texas (6.25%).

Add Multiple Items (Optional)

If you are calculating tax for several items, use the multi-item section to add each item with its price. The calculator will compute the total tax across all items.

View Your Results

See the tax amount, pre-tax price, total with tax, and effective tax rate. For multi-item calculations, you will also see a per-item breakdown and grand total.

Frequently Asked Questions

How do I calculate sales tax on a purchase?

To calculate sales tax, multiply the item's pre-tax price by the sales tax rate expressed as a decimal. For example, if an item costs $50 and the tax rate is 8%, the tax is $50 x 0.08 = $4.00, making the total $54.00. Our calculator handles this automatically — simply enter the price and tax rate, and the results appear instantly. You can also select a US state to auto-fill the correct base tax rate. Remember that actual rates may be higher if your locality adds county or city taxes on top of the state rate.

How do I reverse-calculate sales tax from a total?

To extract the sales tax from a total that already includes tax, divide the total by 1 plus the tax rate (as a decimal). For example, if the total is $108 and the tax rate is 8%, the pre-tax price is $108 / 1.08 = $100, and the tax portion is $8. This is useful when a receipt shows only the final amount and you need to determine how much was tax. Our calculator's 'Extract Tax from Total' mode does this calculation for you with a single click.

Which US states have no sales tax?

Five US states do not impose a state-level sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. However, some localities within Alaska do charge local sales tax. Additionally, many states exempt certain categories from sales tax, such as groceries, prescription medications, and clothing. For instance, Pennsylvania exempts most clothing, and many states exempt food purchased for home consumption. Always check your specific state and local rules, as tax-exempt categories vary widely.

Does the sales tax rate include local taxes?

The state rates shown in our quick-select grid represent only the base state-level sales tax. Many cities, counties, and special districts add their own taxes on top. For example, California's state rate is 7.25%, but the combined rate in Los Angeles can exceed 10%. Similarly, New York's state rate is 8%, but New York City adds 4.5% for a combined rate of 8.875%. To find your exact combined rate, check your local government's tax website or your most recent receipt.

Is sales tax applied to online purchases?

Yes, in most cases. Following the 2018 US Supreme Court ruling in South Dakota v. Wayfair, states can require online sellers to collect sales tax even if they have no physical presence in the state. Most major online retailers now collect sales tax based on the buyer's shipping address. If a retailer does not collect sales tax, the buyer is technically responsible for paying 'use tax' directly to their state. The rules vary by state and by the size of the seller, so check your state's department of revenue for specifics.