Everything Calculator

Discount Calculator

Work out what you actually pay after a discount — including stacked offers such as '30% off, then an extra 20% at the checkout', which never equals 50% off.

Fill in the fields above and select Calculate to see your result and the full working.

Please note: Financial calculators produce estimates using the figures you enter. They exclude fees, taxes, insurance and rate changes unless a field asks for them. They are not financial advice — confirm any significant decision with a qualified adviser or your lender.

Formula used

Final price = original × (1 − d₁ ÷ 100) × (1 − d₂ ÷ 100)

How to use this calculator

  1. Enter the original price before any reduction.
  2. Add the headline discount percentage.
  3. If a second discount applies at the checkout, enter it in the third field.
  4. Compare the effective total discount to the sum of the two — it is always lower.

Example calculation

A $120 item at 30% off, then 20% off at the checkout:

120 × 0.70 = $84

84 × 0.80 = $67.20

Total saved = $52.80, an effective 44% discount.

What does this result mean?

Stacked discounts multiply rather than add, because the second reduction applies to the already-reduced price. 30% then 20% is an effective 44%, not 50%. Retailers rely on this looking better than it is, so the effective figure is the one to compare between offers.

Frequently asked questions

Why isn't 30% + 20% equal to 50% off?
Because the second discount is taken from the already-reduced price. The combined effect is 1 − (0.7 × 0.8) = 44%.
Does the order of two discounts matter?
No. Multiplication is commutative, so the final price is identical either way.
How do I convert an amount off into a percentage?
Divide the amount saved by the original price and multiply by 100 — the percentage calculator does this for you.

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