How to Use
- 1.
Choose Add sales tax when your starting amount is the subtotal before tax.
- 2.
Choose Remove sales tax when your starting amount already includes tax.
- 3.
Enter the price or total amount and select the display currency.
- 4.
Enter the official sales tax rate as a percentage, including decimals when needed.
- 5.
Review the subtotal, sales tax amount, and total after tax.
- 6.
Copy the calculation summary for a quote, note, or quick working record.
Features
Add sales tax to a pre-tax price
Reverse sales tax calculation from a tax-included total
Subtotal before tax, tax amount, and final total breakdown
Custom sales tax rate with decimal support
Quick rate preset buttons
Multiple currency display options
Clear formula shown with every result
Copyable sales tax calculation summary
Frequently Asked Questions
How do I calculate sales tax on a price?+
Multiply the subtotal before tax by the sales tax rate divided by 100. Add that tax amount to the subtotal to get the final price after tax.
How do I calculate sales tax from total?+
Use the Remove sales tax mode. The calculator divides the tax-included total by one plus the tax rate as a decimal, then subtracts the subtotal from the total to find the included tax.
Why is reverse sales tax not the same as subtracting the percentage?+
Because the tax percentage was applied to the pre-tax subtotal, not to the larger final price. Subtracting the percentage from the final price usually produces an incorrect subtotal.
Can I use this as a price before sales tax calculator?+
Yes. Select Remove sales tax, enter the total including tax, and the tool will estimate the subtotal before tax and the tax amount included in the total.
Does this calculator know my local sales tax rate?+
No. Sales tax rates can vary by location, product, customer, and transaction type. Enter the current official rate that applies to your situation.
Can I use decimal tax rates?+
Yes. You can enter rates such as 7.25, 8.875, or any other decimal rate from 0 to 100.
Does the currency selector convert money?+
No. Currency selection only formats the result. It does not perform exchange-rate conversion or determine tax rules.
Why might my receipt show a slightly different amount?+
Receipts may use line-item rounding, item-specific rates, tax-exempt products, taxable shipping, discounts, or local rules that differ from a simple total-level calculation.
Is this sales tax calculator free?+
Yes. The calculator is free to use in your browser, with no signup required for basic calculations.
Is this tax advice?+
No. It is a mathematical estimate only. Confirm current rates, exemptions, and filing requirements with the relevant tax authority or a qualified professional.
About this tool
Free Sales Tax Calculator
Use the free WebToolsEdge Sales Tax Calculator to calculate sales tax on a price, find the final price after tax, or reverse calculate sales tax from a tax-included total. Enter an amount, choose Add sales tax or Remove sales tax, type the rate, and the calculator instantly shows the subtotal before tax, the sales tax amount, and the total after tax. This sales tax calculator online is useful for shoppers, ecommerce sellers, freelancers, small business owners, bookkeepers, and anyone who needs a quick price check before creating a quote or reviewing a receipt. It is designed for simple everyday tax math, not for replacing official tax software or professional advice. When you choose Add sales tax, the tool treats your amount as the subtotal before tax. It multiplies that subtotal by the tax rate and adds the result to the original amount. For example, if a product costs 100 and the sales tax rate is 8.25%, the tax amount is 8.25 and the final price after tax is 108.25. When you choose Remove sales tax, the tool works as a sales tax reverse calculator. This is useful when you only know the final price including tax and want to calculate the price before sales tax. The correct method is to divide the total by one plus the tax rate as a decimal. At 8.25%, a total of 108.25 divided by 1.0825 gives a subtotal of 100 and a sales tax amount of 8.25. Many people try to calculate sales tax from total by subtracting the percentage directly from the final price, but that gives the wrong answer. Sales tax is applied to the smaller pre-tax subtotal, not to the larger tax-included total. That is why a dedicated price before sales tax calculator is helpful when you need an accurate reverse calculation. You can use this add sales tax to price calculator for retail pricing, invoice estimates, online store planning, marketplace listings, budgeting, expense checks, and receipt verification. If you are testing a discount or promotion, calculate the sale price first with the Discount Calculator, then use this sales tax amount calculator to estimate the tax and final checkout price. For broader percent math, the Percentage Calculator can help with rate changes, percentage increase, and percentage difference. For business margin checks, compare revenue and cost using the Profit Calculator. Sales tax rules vary widely. Rates can depend on the state, province, city, county, product category, customer type, delivery address, marketplace rules, tax holidays, exemptions, and the date of the transaction. Some areas have combined state and local taxes, while others have special rates for food, clothing, digital products, services, or shipping. This free sales tax calculator does not automatically look up local rates. Enter the official rate that applies to your transaction. The quick rate buttons are included for convenience only. They are mathematical presets, not a statement that a rate applies in your location. If you sell online, you may also need to understand economic nexus, marketplace facilitator rules, customer location, and whether shipping or handling is taxable. Always confirm current requirements with the relevant tax authority or a qualified tax professional. Currency selection changes how results are displayed. It does not convert money between currencies and does not determine local tax law. Use the same currency for the input and all outputs. Rounding can also differ between point-of-sale systems, accounting tools, and invoices, especially when tax is calculated line by line instead of on the total order. This tool gives a clear three-part breakdown: subtotal before tax, tax amount, and total after tax. That makes it easier to answer common questions such as how much sales tax will be added to a price, what is the final price after tax, and how to find the original price before tax from a receipt total.
Working out checkout pricing? Use the Discount Calculator before tax when a sale or coupon is involved. For business margin checks, compare revenue and costs with the Profit Calculator. If your transaction uses VAT instead of sales tax, use the dedicated VAT Calculator, or browse all Calculators.