How is sales tax calculated?

Sales tax = purchase price × tax rate; total = price + tax.

Why do sales tax rates vary so much by location?

It's typically set by combined state, county, and city governments, each adding their own rate.

Does this calculator handle VAT too?

The same percentage-based math applies to VAT calculations used in many countries.

Sales Tax & VAT Calculator - Add or Remove Tax

Sales Tax & VAT Calculator

Add tax to a price, or work backward from a tax-inclusive price to find the original amount.

Price

Tax / VAT Rate (%)

Price Type

Price Before Tax-

Tax / VAT Amount-

Price After Tax-

What Is a Sales Tax / VAT Calculator?

This calculator adds or removes sales tax (or VAT) from a price. It works both ways: enter a pre-tax price to find the final price, or enter a tax-inclusive price to find how much of it was tax.

Formulas

If price excludes tax: Tax = Price × (rate / 100); Total = Price + Tax
If price includes tax: Net Price = Price ÷ (1 + rate / 100); Tax = Price − Net Price

How to Use This Calculator

Enter the price and the tax or VAT rate.
Choose whether the price you entered already includes tax or not.
Click Calculate to see the pre-tax price, tax amount, and final price.

Worked Example

An item costs $100 before a 15% VAT. Tax = 100 × 0.15 = $15. Total price = $115. If instead $115 already includes 15% VAT, the pre-tax price is 115 ÷ 1.15 = $100, and the tax portion is $15.

Common Uses

Useful for shoppers checking receipts, freelancers invoicing clients, and businesses calculating VAT or sales tax for pricing, bookkeeping, or budgeting.