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Keep markup on cost separate from margin on sales.

Why do equal markup and margin percentages produce different quote totals?

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Use this decision sequence

  1. Use the same complete cost basis for both arithmetic comparisons.
  2. State whether the percentage uses cost or the final selling total as its denominator.
  3. Calculate the selling total before adding separately quoted taxes or discounts.
  4. Use the denominator stated in the actual quote rather than choosing a preferred profit target.

Keep the quantities distinct

Quantity or assumptionHow to use it
Cost markupAdds a percentage of the supplied cost.
Sales marginReserves a percentage of the final sales total.
Same percentageDoes not create the same final quote.

Worked comparison

On 100 USD cost, a 20% markup gives a 120 USD total. A 20% sales margin gives 100/(1−0.2) = 125 USD. The profits are 20 and 25 USD respectively, because the denominator changes. This five-dollar difference comes from the percentage basis rather than a different underlying material quantity.

Check before using the estimate

The calculator compares entered arithmetic. It does not recommend a margin, infer overhead or supply tax rules. The example values are illustrative arithmetic inputs. Replace them with your measured plan, selected product information and actual quote where relevant.

All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.

Calculation and scope checked 2026-10-04. Methods and scope.

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