Sales Tax Calculator
Add or remove sales tax instantly. Free online sales tax calculator for pre-tax and after-tax prices in any rate.
What Is a Sales Tax Calculator?
A sales tax calculator computes how much tax is applied to a purchase and the final amount you pay. You can either add tax to a pre-tax price or remove tax from a total to find the pre-tax amount — essential for budgeting, reimbursements, and business bookkeeping.
Sales tax rates vary by state, county, and city. This tool works with any rate, so you can calculate for your exact location or a rate you enter manually.
Add Tax vs. Remove Tax
Adding tax: price × (1 + rate). A $100 item at 8% tax costs $108 total. Removing tax: total ÷ (1 + rate). If you paid $108 and the rate is 8%, the pre-tax price was $100.
Both modes are built into this calculator — just toggle between them. This is especially useful for freelancers and small businesses tracking tax-deductible purchases.
How to Use
- Enter the price — either pre-tax or the total you paid
- Enter the applicable tax rate (e.g. 8.25 for 8.25%)
- Choose Add Tax or Remove Tax mode
- Read the final result and the exact tax amount