Sales Tax Calculator

The Sales Tax Calculator computes the total cost of a purchase including sales tax, or calculates the pre-tax price from a tax-inclusive total. Essential for budgeting purchases, comparing prices across states, and understanding the true cost of goods and services.

How the Formula Works

Tax Amount = Price × (Tax Rate ÷ 100). Total = Price + Tax. Pre-tax Price = Total ÷ (1 + Tax Rate ÷ 100).

How to Use This Calculator

  1. Enter the item price (before tax)
  2. Enter your local sales tax rate
  3. View the tax amount and total cost

Tips & Best Practices

  • Compare total cost (including tax) when shopping across state lines or online
  • Many states exempt groceries, prescription medicines, and clothing from sales tax
  • Online purchases often include sales tax based on your shipping address, not the seller's location

Important Limitations

  • Tax rates change frequently — always verify current rates with your local tax authority
  • Does not account for item-specific exemptions (food, medicine, clothing vary by state)
HomeFinancialBlogUnit Converters