Sales Tax Calculator

Quickly calculate sales tax and final total from a subtotal and tax rate, or reverse-calc the subtotal when you only know the final price including tax.

Calculation mode

I know subtotal (before tax) I know final total (with tax)

Subtotal (before tax)

Item(s) total before tax and fees.

Sales tax rate (%)

Enter your local sales tax rate, like 8.75 for 8.75%.

Results

Choose a mode, enter either the subtotal or the final total, then tap Calculate to see the breakdown.

This tool assumes a single percentage rate applied to the taxable subtotal. Actual store receipts may include additional local fees.

What this calculator shows

Subtotal – price before tax.
Sales tax amount – tax collected on the transaction.
Final total – what you pay after tax.

Forward mode:

Tax = Subtotal × (Tax rate ÷ 100).
Total = Subtotal + Tax.

Reverse mode (when you only know the total with tax):

Subtotal = Total ÷ (1 + Tax rate ÷ 100).
Tax = Total − Subtotal.

Actual tax rules can be more complex for shipping, discounts, or multiple jurisdictions. This calculator is a simple estimate for everyday use.

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