Sales Tax Calculator – Add or Remove Tax
Free sales tax calculator: add tax to a price or reverse out pre-tax amount from a total. Instant tax math — private, no signup.
Private: calculation runs only in your browser.
Sales Tax Calculator
Tax (8.25%): $8.25
Add mode: tax = amount × rate ÷ 100 · total = amount + tax.
Related tools
All toolsFAQ
How do I remove sales tax from a total?
Divide the gross by (1 + rate/100). Example at 10%: net = gross ÷ 1.10.
Is this tax advice?
No. Simplified everyday math only — not binding tax advice.
What Is a Sales Tax Calculator?
A sales tax calculator adds a tax rate to a pre-tax price or backs tax out of a tax-inclusive total. Useful for receipts, invoices, and checking checkout totals.
Sales Tax Formulas
Frequently Asked Questions
How do you add sales tax to a price?
Multiply the pre-tax amount by the rate percent, then add that tax to the amount.
How do you reverse sales tax?
Divide the tax-inclusive total by (1 + rate/100) to get the pre-tax price.
What is 8.25% tax on $100?
Tax = $8.25 · total = $108.25.
Is this sales tax calculator free?
Yes — free and private in your browser.