Sales Tax Calculator - Add or Extract U.S. Sales Tax Online Free

What Is a Sales Tax Calculator?

A sales tax calculator is a tool that computes the amount of sales tax owed on a purchase and the total cost including tax. In the United States, sales tax is a consumption tax imposed by state and local governments on the sale of goods and certain services. Unlike a flat federal tax, sales tax rates vary significantly depending on the state, county, city, and even special taxing districts where the purchase takes place. A reliable sales tax calculator eliminates the guesswork by applying the correct combined rate automatically.

This tool supports two essential functions: adding tax to a pre-tax purchase amount and extracting tax from a total that already includes tax. Whether you are budgeting for a shopping trip, verifying a receipt, or calculating a tax-inclusive price for your business, this calculator gives you an accurate result in seconds.

How Does Sales Tax Work in the U.S.?

sales tax in the United States is governed at the state level, with 45 states and the District of Columbia imposing some form of sales tax. Each state sets its own base rate, and local jurisdictions (counties, cities, transit authorities, and special districts) can add additional taxes on top. The combined rate you pay depends on where you make the purchase.

For example, the base state sales tax rate in California is 7.25%, but local additions in some cities can push the combined rate above 10%. Meanwhile, states like Oregon, Montana, Delaware, and New Hampshire have no sales tax at all. Alaska has no statewide sales tax, but some local jurisdictions impose their own.

How to Use This Calculator

1. Enter the purchase amount — Type the pre-tax price of the item or service into the input field.
2. Select your state — Choose the U.S. state (or Washington, D.C.) where the purchase is being made from the dropdown. The tool loads the current combined state and local rate.
3. Click Calculate — View the sales tax amount and the total cost including tax. For tax-inclusive totals, switch to "Extract Tax" mode to separate the tax from the total.

Add Tax vs. Extract Tax

Understanding when to use each mode is important for getting the correct result:

• Add Tax Mode — Use this when you have a pre-tax price and need to find the tax amount and total. Formula: Tax = Amount × Rate; Total = Amount + Tax.
• Extract Tax Mode — Use this when you have a total that already includes tax and need to determine the tax amount and the original pre-tax price. Formula: Tax = Total − (Total / (1 + Rate)).

For example, if a receipt shows a total of $107.25 in a state with a 7.25% rate, extracting the tax reveals $7.25 in tax and a $100.00 pre-tax price.

State Sales Tax Rates Overview

Sales tax rates across the U.S. range from 0% to over 10% when combining state and local rates. Here are a few examples:

• Oregon — 0% (no state or local sales tax)
• California — 7.25% base, up to 10.25% in some cities
• Tennessee — 7.00% base, up to 9.75% in some areas
• Alaska — 0% statewide, but local taxes up to 7.50% in some boroughs
• Delaware — 0% (no state or local sales tax)

The calculator includes all 50 states and Washington, D.C., with combined rates that reflect the most current available data.

Use Cases

Shopping Budgeting

Before heading to the store or placing an online order, use the calculator to estimate the total cost of your purchase including tax. This helps you budget accurately and avoid surprises at checkout, especially for large purchases like electronics, furniture, or appliances.

Invoice Verification

If you receive an invoice or receipt and want to confirm the sales tax was calculated correctly, use the "Extract Tax" mode. Enter the total amount and your state to see the expected tax, then compare it to what was charged. This is particularly useful for business expense verification and auditing.

Business Pricing

Businesses that sell taxable goods and services need to display accurate tax-inclusive prices. Use the calculator to determine the total price customers will pay, or to work backward from a desired total to find the correct pre-tax price.

Expense Tracking

When recording business expenses, separating the tax from the total is important for accurate bookkeeping and tax deduction calculations. The "Extract Tax" mode makes this quick and straightforward.

Cross-State Shopping

If you live near a state border or are shopping online from a retailer in another state, comparing tax rates can reveal meaningful savings on large purchases. The calculator lets you check the total cost for any state instantly.

Common Sales Tax Exemptions

Not all purchases are subject to sales tax. Common exemptions vary by state but may include:

• Groceries — Many states exempt or reduce tax on unprepared food items.
• Prescription medications — Most states do not charge sales tax on prescription drugs.
• Clothing — Some states (e.g., New York, Pennsylvania) exempt clothing below a certain price threshold.
• Manufacturing inputs — Materials purchased for resale or used in manufacturing are often exempt with a resale certificate.
• Tax-exempt organizations — Nonprofits, government agencies, and religious institutions may qualify for exemptions.

This calculator applies the general combined rate. If your purchase qualifies for an exemption, the actual tax owed may be lower.

Sales Tax vs. VAT and GST

Sales tax is unique to the United States and a few other countries. Most of the world uses Value-Added Tax (VAT) or Goods and Services Tax (GST) instead. The key difference is that sales tax is collected only at the final point of sale to the consumer, while VAT/GST is collected at each stage of the supply chain. If you are calculating tax for an international transaction, see our GST Calculator instead.

Related Tools

• GST Calculator — Calculate Goods and Services Tax for countries that use GST, including India, Australia, New Zealand, and Canada.
• Discount Calculator — Calculate the final price after applying percentage or dollar-amount discounts to any purchase.
• Percentage Calculator — Calculate percentages, percentage increases, decreases, and differences between values.

Privacy

All calculations are performed entirely in your browser. No purchase amounts, state selections, or calculated results are sent to our servers. We do not store, log, or share any information you enter into this tool. The calculator works offline once the page has loaded.