The Expensive Mistake

Here's a scenario that plays out every day:

Contractor: "I mark up my materials 30%, so I'm making 30% profit."

Reality: That contractor is actually making 23% margin.

On a $10,000 job, that's the difference between $3,000 and $2,300 in gross profit. Over a year of $500,000 in revenue, that misunderstanding costs $35,000.

Let's clear this up once and for all.

Markup vs. Margin Defined

Markup

Markup is the percentage added TO your cost to get the selling price.

Formula: Selling Price = Cost × (1 + Markup%)

Example: $100 cost with 30% markup $100 × 1.30 = $130 selling price

Margin

Margin is the percentage of the selling price that is profit.

Formula: Margin = (Selling Price - Cost) / Selling Price

Example: $130 selling price, $100 cost ($130 - $100) / $130 = 23% margin

The Key Insight

30% markup ≠ 30% margin

In the example above:

Markup: 30%
Margin: 23%

They're related but different. And confusing them will hurt your profits.

Markup to Margin Conversion Table

Markup	Actual Margin
10%	9.1%
15%	13.0%
20%	16.7%
25%	20.0%
30%	23.1%
35%	25.9%
40%	28.6%
50%	33.3%
75%	42.9%
100%	50.0%

Notice: You need a 100% markup to achieve a 50% margin.

Margin to Markup Conversion

What markup do you need for a specific margin?

Formula: Markup = Margin / (1 - Margin)

Desired Margin	Required Markup
10%	11.1%
15%	17.6%
20%	25.0%
25%	33.3%
30%	42.9%
35%	53.8%
40%	66.7%
50%	100.0%

Want a 30% margin? You need a 43% markup, not 30%.

Real-World Example

Let's price a water heater installation:

Costs:

Water heater: $500
Materials: $100
Labor (3 hours × $50): $150
Total Cost: $750

Pricing with 30% Markup: $750 × 1.30 = $975 selling price Margin: ($975 - $750) / $975 = 23% margin

Pricing for 30% Margin: Selling Price = Cost / (1 - Margin) $750 / (1 - 0.30) = $750 / 0.70 = $1,071 selling price

That's a $96 difference PER JOB from understanding the math correctly.

Which Should You Use?

Use Markup When:

Calculating prices from costs (most common for contractors)
Your industry uses markup language
Comparing to competitor pricing on materials

Use Margin When:

Analyzing profitability
Talking to accountants or investors
Setting profit targets

Our Recommendation:

Think in margins, price with markup.

Decide what margin you need (usually 30-40% gross margin minimum), then calculate the required markup.

Common Mistakes

Mistake 1: Inconsistent Application

Marking up materials at 30% but forgetting to markup labor. Apply your markup to ALL costs.

Mistake 2: Markup on Cost, Not Selling Price

Some contractors accidentally calculate markup on the selling price, which gives a completely wrong number.

Mistake 3: Not Including All Costs

If you markup materials but forget overhead allocation, your "30% margin" is actually much lower.

Quick Reference Formulas

Cost to Selling Price (using markup): Selling Price = Cost × (1 + Markup%)

Selling Price to Cost (using margin): Cost = Selling Price × (1 - Margin%)

Margin from Markup: Margin = Markup / (1 + Markup)

Markup from Margin: Markup = Margin / (1 - Margin)

Key Takeaways

Markup and margin are NOT the same thing
30% markup = 23% margin (not 30%)
You need 100% markup to achieve 50% margin
Decide your target margin, then calculate required markup
Apply markup to ALL costs, not just materials

EstimateBuilderPro Does the Math

Our software handles markup/margin calculations automatically:

Set your target margin
See the required markup
Apply consistently across all estimates
Track actual margins vs. targets

Start your free trial and price for profit.