Sales Tax Calculator

Add sales tax to a price or find the pre-tax amount from a tax-included total.

Tax Calculator

0%GST slabs: 5% | 12% | 18% | 28%28%

Tax Amount (18%)

₹180

Pre-tax Amount₹1,000
Tax (18%)₹180
Total (incl. tax)₹1,180

Sales Tax Calculator Formula & How It Works

Price + Tax = Price × (1 + Tax Rate) | Pre-tax = Inclusive Price ÷ (1 + Tax Rate)
  • Add tax: Final = Original × (1 + rate/100)
  • Remove tax: Original = Inclusive ÷ (1 + rate/100)
  • Tax amount = Final − Original
  • Combined rate = State rate + County rate + City rate

Sales tax is a consumption tax added to the purchase price of goods and services. US combined sales tax rates range from 0% (Oregon, Montana, New Hampshire, Delaware, Alaska) to 10%+ in some cities. Most states have a base rate with additional county/city rates layered on top.

Sales Tax Calculator FAQs

How do you calculate sales tax?

Tax amount = Price × (Tax Rate / 100). Final price = Price + Tax = Price × (1 + Rate/100). Example: $100 at 8% sales tax = $100 × 1.08 = $108 total, with $8 tax.

Which US states have no sales tax?

Five states have no statewide sales tax: Oregon, Montana, New Hampshire, Delaware, and Alaska (though Alaska allows local taxes). Most other states have rates from 4% (Hawaii, Wyoming) to 7.25% (California base rate).

Is sales tax applied before or after coupons/discounts?

In most states, sales tax is calculated on the discounted price (after coupons). Some states tax the original price before coupons. For precise calculations, check your state's rules.

Related Calculators

VAT Calculator

Add VAT to a net price or remove VAT from a gross price for any country or rate.

Discount Calculator

Calculate the final price after discount and the amount you save on any purchase.

GST Calculator

Add GST to a price or work backwards from a GST-inclusive amount — with instant CGST/SGST split.

Margin Calculator

Calculate gross margin, net margin, and markup — and convert between margin and markup.