Sales Tax Calculator

Use this calculator to estimate sales tax amount and total price including tax.

What this calculator does

The sales tax calculator shows the tax added to a price and the final total.

It is useful for:

• checkout calculations
• pricing reviews
• invoicing
• ecommerce tax checks

Sales Tax Formula

Sales Tax = Amount × Tax Rate

Total Including Tax = Amount + Sales Tax

Where:

• Amount = price before tax
• Tax Rate = sales tax percentage
• Sales Tax = added tax amount

Example calculation

If:

• Amount = 100
• Sales tax rate = 8%

Then:

• Sales tax = 8
• Total including tax = 108

What is sales tax?

Sales tax is a consumption tax added to the sale of goods and services in many regions.

It increases the final amount paid by the customer.

Why sales tax matters

Sales tax matters because it helps businesses:

• price products correctly
• avoid undercharging or overcharging
• prepare invoices properly
• understand final customer totals

When to use this calculator

Use this calculator when you want to:

• estimate checkout totals
• compare tax-inclusive and tax-exclusive pricing
• build quotes or invoices
• review ecommerce pricing

Common mistakes

Common mistakes include:

• using the wrong tax rate
• forgetting local tax differences
• confusing VAT with sales tax
• applying tax after discounts incorrectly

Sales tax vs VAT

These are similar but not identical.

• Sales tax is usually added at the final sale
• VAT is applied at multiple stages of the value chain

Related calculations

You may also want to use:

• VAT Calculator
• Product Price Calculator
• Discount Calculator

FAQs

What is sales tax?

Sales tax is a tax added to the price of goods or services.

How do you calculate sales tax?

Sales Tax = Amount × Tax Rate.

Why is sales tax important?

It helps businesses calculate final prices and comply with pricing requirements.

What is the difference between sales tax and VAT?

Sales tax is typically charged at final sale, while VAT is charged across the supply chain.