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Coupon Stacking Value Calculator

Work out coupon stacking value instantly with clear inputs, formula shown and shareable results.

About Coupon Stacking Value Calculator

When a percentage coupon and a fixed-amount coupon stack, the order matters. Applying the percentage first leaves a larger base for the fixed deduction, so it always gives the lower total — the difference is exactly the percentage times the fixed amount.

Formula

Coupon order

percentage first: (T x (1 - p)) - F; fixed first: (T - F) x (1 - p); difference = p x F

Worked example

With the default values below, Coupon Stacking Value Calculator returns Final total of $56.30. Change any input above and every figure here is recalculated in your browser.

Inputs used

Basket total
78
Percentage coupon
15 %
Fixed-amount coupon
10
Apply orderone of Percentage first, Fixed amount first
Percentage first

Results

Final total
$56.30
Total saving
$21.70
Better order
Percentage coupon first is cheaper
Difference between orders
$1.50

Step by step

  1. 1Values used
  2. 2Coupon order
  3. 3Final total= 56.30
  4. 4Total saving= 21.70
  5. 5Better order= Percentage coupon first is cheaper
  6. 6Difference between orders= 1.50

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Which order is always better?

Percentage first, then the fixed amount. The saving difference is the percentage multiplied by the fixed coupon value — 1.50 on a 15% and 10 combination.

Do retailers let you choose?

Rarely. Most checkout systems apply a fixed sequence, but knowing the difference tells you whether it is worth asking.

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