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Tax Calculator

Calculate tax amounts from a subtotal or reverse-calculate pre-tax amounts from a total. Supports multiple tax rates. Free, no signup required.

FreeNo SignupNo Server UploadsZero Tracking
Calculation Mode

Enter the subtotal to calculate how much tax to add.

Amount
Tax Rates
%

Tax Calculation

Subtotal (before tax)$0.00
Tax (10%)$0.00
Total (with tax)$0.00

Summary

$0.00 + 10% tax = $0.00

Effective tax rate: 0.00%

How to Use Tax Calculator

  1. 1

    Choose a mode

    Select 'Add Tax' to calculate tax on a subtotal, or 'Reverse Tax' to extract tax from a total that already includes it.

  2. 2

    Enter the amount

    Type the subtotal (in Add Tax mode) or the tax-inclusive total (in Reverse Tax mode).

  3. 3

    Set tax rates

    Enter one or more tax rates. Click '+ Add Rate' to add additional taxes like state and local rates.

  4. 4

    Read the results

    The calculator shows the breakdown per tax rate, total tax amount, and final total in real time.

Frequently Asked Questions

Reverse tax calculation takes a total amount that already includes tax and works backward to find the pre-tax subtotal and the tax amount. This is useful when you know the final price but need the tax breakdown.

Yes. Click '+ Add Rate' to add as many tax rates as you need. The calculator combines them and shows a per-rate breakdown.

No. Everything runs in your browser. No data is sent to any server.

Multiple tax rates are added together (e.g., 7% state + 3% local = 10% combined) and applied to the subtotal. Each rate's contribution is shown separately.