Sales Tax Calculator
Free online sales tax calculator — add sales tax to a product price or reverse-calculate the original price from a tax-inclusive total. See tax amount, final price and tax percentage with support for ₹, $, € and £.
Results update instantly as you type.
What is Sales Tax?
Sales tax is a consumption tax that governments add to the price of most goods and services. When you buy something, the seller charges you a small percentage on top of the listed price and later pays that money to the government. It is one of the most common ways countries, states and cities raise revenue to fund public services. Because the tax is a percentage of the price, more expensive items carry a larger tax amount, while the rate itself stays the same. For shoppers, sales tax is the difference between the price on the shelf and the amount you actually pay at the checkout. For businesses, it is money collected on behalf of the tax authority and must be reported and paid accurately.
How to Calculate Sales Tax?
Calculating sales tax is simple once you know the price and the tax rate. To add tax to a price, use:
- Sales Tax = Product Price × Tax Rate ÷ 100
- Final Price = Product Price + Sales Tax
Sometimes a price already includes tax and you need to find the original pre-tax amount. This is called a reverse sales tax calculation:
- Original Price = Final Price ÷ (1 + Tax Rate ÷ 100)
- Sales Tax = Final Price − Original Price
Example
Suppose a product costs ₹1,000 and the sales tax rate is 18%. The tax amount is 1,000 × 18 ÷ 100 = ₹180, and the final price you pay is 1,000 + 180 = ₹1,180. Working in reverse, if a tax-inclusive price is ₹1,180 at an 18% rate, the original price is 1,180 ÷ 1.18 = ₹1,000 and the tax portion is ₹180. The Uni Calculator Hub Sales Tax Calculator does all of this instantly for you in INR, USD, EUR or GBP.
Frequently asked questions
What is sales tax?
Sales tax is a percentage-based tax added to the price of goods and services at the point of sale. The seller collects it from the buyer and passes it on to the government. The final amount you pay equals the product price plus the sales tax calculated on that price.
How is sales tax calculated?
Sales tax is calculated with the formula: Sales Tax = Product Price × Tax Rate ÷ 100. The total price is then Product Price + Sales Tax. For example, a ₹1,000 product with an 18% sales tax has a tax amount of ₹180 and a final price of ₹1,180.
What is reverse sales tax calculation?
Reverse sales tax works backwards from a tax-inclusive price to find the original price. The formula is: Original Price = Final Price ÷ (1 + Tax Rate ÷ 100), and Sales Tax = Final Price − Original Price. This is useful when a displayed price already includes tax and you need to know the pre-tax amount.
What is the difference between sales tax and GST?
Sales tax is typically a single tax added at the final point of sale, common in the United States. GST (Goods and Services Tax) is a multi-stage value-added tax used in countries like India, charged at each stage of the supply chain with input credits. The math for adding or removing both taxes from a price is the same, but the underlying tax systems differ.
Is sales tax included in product prices?
It depends on the country and the seller. In many US states, prices are shown before tax and the sales tax is added at checkout. In many other countries, displayed prices are tax-inclusive. Use the reverse mode of this calculator when a price already includes tax.
Why do tax rates vary?
Tax rates vary by country, state, city and product category. Governments set different rates to raise revenue, encourage or discourage certain purchases, and exempt essentials. This is why the same item can carry different sales tax in different locations.
Can businesses use this calculator?
Yes. Business owners, freelancers and retailers can use it to quickly work out tax amounts, set tax-inclusive prices, prepare invoices and check how much tax to collect. It supports INR, USD, EUR and GBP for international use.
How accurate is this calculator?
The calculator uses exact mathematical formulas, so results are accurate for any price and tax rate you enter. Always confirm the correct sales tax rate for your location and product category, as rates are set by tax authorities and can change.
Related calculators
Estimates only — confirm the correct sales tax rate for your location and product category.