Sales Tax Calculator
Add sales tax to any amount and see the total. It also works in reverse — the pre-tax line shows what the amount would be if it already included tax.
Example: with Amount $100 · Sales tax rate 8.25% → Total with tax: $108.25.
- Sales tax$8.25
- If this is a total, pre-tax is$92.38
Computed by the calculator below using its default values. Change any input to see your own numbers.
Pre-tax + tax
Know both dollar amounts? Solve for the rate
🧮 Automate sales tax for your store
Check it outForward and reverse
Enter a pre-tax price and the top line shows the total you'll pay. If instead you have a tax-inclusive total and want the price before tax, read the bottom line — it divides the amount by one plus the rate. Combined rates often stack state, county, and city taxes, so confirm your local rate.
How it’s calculated
Tax = amount × rate; total = amount + tax. Pre-tax from a total = total ÷ (1 + rate). If you know both dollar figures instead, the implied rate = (after-tax ÷ before-tax − 1) × 100.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Using the state base rate and forgetting local taxes.
- Applying the rate to a tax-included total.
Frequently asked questions
Can it remove tax from a total?
Yes — the 'pre-tax' line treats your amount as a tax-included total and shows the price before tax.
Where do I find my rate?
Your state revenue department lists combined rates by address; receipts also show the combined rate you paid.
Is sales tax the same everywhere?
No. Rates vary by state and locality, and a few states have no sales tax at all.
Can it solve for the rate itself?
Yes — enter the before-tax amount and the after-tax total in the ‘solve for the rate’ section and it back-calculates the implied sales tax rate.