Discount Calculator

Check a single percentage discount and an optional tax assumption without juggling mental math.

Free to useCalculated in your browserv0.2.1 · Method documented September 12, 2026

Your inputs

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Know the limits. One discount only. Actual coupon and tax treatment may differ; no location-specific tax rate is supplied.

How it works

A $100 original price with 20% off becomes $80 before tax. A supplied 10% tax rate adds $8 in this model.

Savings = original price × discount
Discounted price = original price − savings
Final price = discounted price × (1 + tax rate)

Try the example

The starter inputs above produce:

Final price: $80.00

Change the inputs to match your own situation. The result is an estimate or text transformation, not a substitute for reviewing your source data.

A few useful details

Can I combine two discounts?

Use the first discounted price as the new original price for the second calculation. Two successive 10% discounts give 19% off overall, not 20%.

Is tax applied before or after the discount?

This calculator applies your supplied tax rate after the discount. It is an assumption, not a determination of local rules.

Do I need an account?

No. This release runs without an account, API key or payment. Saving a favorite stores only the tool’s identifier in this browser, not your inputs.