Calculate the total cost including sales tax
A sales tax calculator computes total purchase price including state and local sales tax based on item price and applicable tax rate. Sales tax ranges from 0% (Alaska, Delaware, Montana, New Hampshire, Oregon have no state sales tax) to 9.56% in Tennessee (state+local combined), with most states 6-8%. Formula: Price × (1 + Tax Rate) = Total. Also calculates tax amount separately, or reverses to find pre-tax price from total. Essential for shoppers budgeting purchases, retailers pricing products, online sellers calculating tax obligations, and anyone buying/selling goods requiring sales tax collection.
Budget accurately by knowing true purchase cost including tax—$2,000 laptop actually costs $2,200 in 10% sales tax area. Retailers set competitive pricing by calculating pre-tax price that results in attractive total: want $99.99 after-tax price in 7% area, need to price product at $93.45 pre-tax. Online sellers comply with economic nexus laws requiring tax collection in states where you exceed $100,000 sales or 200 transactions—calculate correct rates for each state. Compare prices across locations: $1,000 TV in Oregon ($0 tax) versus Washington (10.4% combined tax = $1,104) shows $104 savings buying across border. Understand deductible business expenses: sales tax on business purchases often deductible, increasing true cost of equipment. Calculate cost basis correctly for accounting and tax purposes.
Enter item price (pre-tax amount) and sales tax rate percentage for your location (state + local combined rate). Calculator shows total price including tax and tax amount separately. Find local rate using ZIP code lookup tools (TaxJar, Avalara) as rates vary by city and county within states. For multiple items: calculate subtotal of all items, then apply tax once to subtotal. Reverse calculate: enter total paid amount and tax rate to find pre-tax price—useful for expense reporting or determining merchant pricing. Online sellers use automated tax calculation services (Shopify Tax, TaxJar, Avalara) that handle 12,000+ US tax jurisdictions. For tax-exempt purchases (resale, nonprofit, government), provide exemption certificate to seller.
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Common questions about sales tax calculator