# Calculating Total Booked Margin with Multiple Percentages

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I'm trying to calculate the total margin with an original booked margin on a project with a change order booked at a different booked margin.

Project Steve booked at 50% margin, CO1 booked at 25%. Combined, what would the Current Booked Margin be? How would I write the formula for this?

• Overachievers
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How do you define your Current Booked Margin? Is it the average margin percentage for all contract items? Is it weighted by the contract amount of the contract item?

I would define Current Booked Margin as the total margin on all contract items combined. Let's say your original contract cost is \$1,000. The calculated margin is \$500. CO1 cost is \$500, with a calculated margin of \$125.

Your total contract cost is \$1,500, with a total margin of \$625. To get the total margin percentage, I would take 625/1500, which is .42 or 42%.

That's just one way of thinking about it, though.

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