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Foolproof Markup Math

If your estimates are accurate, but you’re still losing money, it could be a miscalculated markup. Here’s how to correct your mistake.

March 29, 2019

Most remodeling contractors quickly learn to estimate project costs accurately, but they often have trouble when it comes to setting a selling price for their work. They know they need to charge more than the actual cost to build the project, but they don’t have a good handle on what their actual overhead costs are. Many simply add 10% or 15% and hope for the best. Others may have heard that a remodeling company should earn at least 30% to cover overhead and profit. It seems high, but they want to be successful, so they mark up the job by multiplying estimated direct costs by 1.3 [1].

markup math for contractors for margin

[1] Multiplying direct costs by 1.3 amounts to a 30% markup, but it does not yield a 30% margin. If this is the way you’re doing it, you’re losing money on every job.

Wait, what happened? Why does that 30% markup ($3,000) amount to just a 23.1% margin? It’s because markup is a percentage of costs (3,000 ÷ 10,000 = 30.0%), whereas margin is a percentage of the selling price (3,000 ÷ 13,000 = 23.1%). To achieve a 30% margin, you need a markup of 42.8% [2].

markup math for contractors for margin

[2] Margin is a percentage of the selling price. To achieve a 30% margin, you have to add 42.8% to estimated costs.

Whether you need a 30% margin to cover actual overhead and profit is a topic for another time (you may need more). But assuming you do and that estimated costs for this hypothetical job are accurate, if you do things #TheRightWay and sell the job for $14,280, you earn $3,567 to cover overhead, plus $713 in profit. 

But if you sell the job for $13,000, you lose big. Your $3,000 markup leaves you $567 in the hole—money that comes out of your pocket to cover overhead expenses—plus, you don’t get the $713 in profit. On bigger jobs, the lost dollars add up fast [3].

markup math for contractors for margin

[3] Confusing a 30% markup with a 30% margin leads to a selling price that fails to cover overhead expenses and wipes out profit.

Divide and Conquer

You can also find the proper selling price by dividing instead of multiplying. Subtract your target margin from one, then divide estimated costs by the result. For example, to find the selling price at a 30% margin, divide by 0.7 (1.00 – 0.3) [4]

markup math for contractors for margin

[4] Another way to find the selling price is to subtract the decimal value of your target margin from one, then divide that number into estimated costs.

markup math for contractors for marginBoth methods work equally well, and since most contractors have a smartphone in their pocket, doing the actual math is pretty simple either way. To make things even easier, whether you multiply or divide you can look up the correct markup factor on a chart [5].

Selling at the right price is a good start, but you have to produce the job on budget to earn your margin. If you’re still losing money, the most common culprits are failing to account for all overhead costs or undercharging for labor, two topics we’ll address in a future article.

[5] To use the Markup Multiplier chart, look up your target margin percentage (overhead plus profit) in the left-hand column. Then use the corresponding number in the right column to multiply estimated costs. For example, to find the selling price at a 30% margin, you would multiply estimated costs by 1.43.

To use the Markup Divisor chart, divide estimated costs by the number in the right-hand column. For example, for a 30% margin, divide costs by 0.70.

About the Author

About the Author

Sal Alfano is executive editor for Professional Remodelersal.alfano@gmail.com, 202.365.9070



Thanks, this gave me a multi way to see it


Just a note to edit: The header on the right hand column of your final table likely should be "Divide by this number..." instead of "multiply by...".

Always valuable stuff, Sal. Thanks for the ongoing business take.

kschuler's picture

Hi Greg,

Good eye—we've made the appropriate edits, and the chart's language should be good to go. Thanks for your diligent reading!

Sal, I love this and will share it with many of our dealers. You would be surprised how often someone doesn't understand that a 35% margin is not a 1.35 markup. We have changed our language so it's easier to understand but still spend a lot of time explaining math to sales reps. 35% margin is a 1.55 markup - too many get confused and think their sale is profitable and meeting guidelines until accounting comes back with a math lesson in tow.

Sal: This may be the most misunderstood calculation in contracting and the single greatest cause of contractor failure. I wish you could dedicate a page or repost this every month. It would benefit everyone in the industry greatly.

Anyone remember Walt Stoeppelwerth? I attended several of his seminars. His recommended markup was 1.67 to get to 40% GROSS profit. Overhead needs to be considered for each job. I always found it difficult to stay afloat with only 30% gross profit.

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