KKoumen Tools PRO

What you actually pay.

Sale price from a percent off, or the real percent off from a sale price. Both directions, one screen.

$
% off
%
You pay
$84.00
You save$36.00
Discount30%
With tax$84.00

Stacked discounts

Two discounts do not add. 20% off then another 20% off is 36% off total, not 40%. Multiply the remainders: 0.8 x 0.8 = 0.64, so you pay 64%.

What you actually pay after a discount

A discount tag tells you the percentage. It does not tell you the price. And when a store stacks two discounts, the combined figure is almost never what people assume.

  1. Enter the original price. The price before any reduction. If the tag says "$120, was $160", the original is $160 and the discount is 25%.
  2. Enter the discount percentage. One number, taken off the original.
  3. Add a second discount if the store is stacking them. "Extra 20% off already-reduced items" means the second percentage comes off the discounted price, not the original. The tool applies them in sequence, which is how stores actually do it.
  4. Add sales tax if you want the out-the-door number. Tax is charged on the discounted price, not the original. Enter your local rate to see the final amount rather than the pre-tax one.

When this comes up

Questions

Does 30% off plus another 20% off equal 50% off?

No, and this is the trap. Two successive discounts multiply: 0.7 × 0.8 = 0.56, so you pay 56% of the original, which is a 44% total discount. The gap between 44% and the 50% people expect is exactly why stores stack discounts instead of combining them into one number.

Is the discount applied before or after tax?

In every US state and in the EU, a percentage discount reduces the taxable amount, so tax is charged on the discounted price. If a store charges tax on the pre-discount total, that is an error worth querying.

How do I find the original price if I only know the sale price?

Divide by (1 − discount). A $68 sale price at 15% off means 68 / 0.85 = $80 original. Going the other way — adding 15% to $68 — gives $78.20, which is the same base error described above.

What does "up to 70% off" usually mean in practice?

That at least one item in the store is 70% off, and most are considerably less. It is a legal advertising phrase in most jurisdictions precisely because of that gap. Treat the number as the ceiling, not the average.

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