Quick example
Tax on three $19.99 items at 8.25%
The subtotal is $59.97. Multiplying by 8.25% gives $4.947525, which rounds to $4.95 in tax. The final total is $64.92.
The formula
From shelf price to final total
Subtotal
Price per item multiplied by the whole-number quantity.
Tax amount
Subtotal multiplied by the entered percentage divided by 100.
Final total
Subtotal plus the tax amount after cent rounding.
Per-item total
The final total divided evenly by the quantity.
Rate lookup
Enter the rate that actually applies
This calculator does not infer a tax rate or determine whether an item is taxable. Rates and exemptions vary by location and purchase type. Use the combined rate shown by the seller or tax authority.
Common questions
Sales tax FAQ
How do I calculate sales tax?
Multiply the subtotal by the rate divided by 100, then add the result.
Does this look up my local rate?
No. It avoids location tracking and uses the rate you enter.
How is tax rounded?
The total tax for the entered quantity is rounded to the nearest cent.