Markup vs. Margin Converter

The mistake this calculator exists to fix

A trades business owner buys a part for $100, marks it up 50%, and sells it for $150. The owner thinks: "I made 50% margin on that." The actual margin is 33.3%. The difference — 17 percentage points — compounds across every unit sold and every job invoiced. Across a year, it's the difference between a healthy business and one that's quietly bleeding cash.

This is the most common pricing mistake in trades, small retail, and service businesses. Owners price by markup (it's how suppliers quote) but think in margin (it's what shows up on the P&L). The two get conflated, and pricing decisions end up systematically too low.

The formulas

Margin = (Price − Cost) ÷ Price        ← fraction of REVENUE
Markup = (Price − Cost) ÷ Cost         ← fraction of COST

Convert markup → margin:  margin = markup ÷ (1 + markup)
Convert margin → markup:  markup = margin ÷ (1 − margin)
Find price from cost+margin:  price = cost ÷ (1 − margin)

The formulas are short. The point isn't the math — it's internalising that they produce different numbers, and that the gap widens fast.

A worked example

A plumber buys a fixture for $80. The supplier recommends a 50% markup. So the plumber sells it for $120.

Markup math: ($120 − $80) ÷ $80 = 50%. ✓

Margin math: ($120 − $80) ÷ $120 = 33.3%.

Same $40 of profit on the part, two different denominators — and the plumber's P&L will report 33.3% gross margin on parts, not 50%. Because if the goal was actually to keep half of every dollar of revenue (50% margin), the part needed to sell at $160, not $120 — a 100% markup, not 50%.

Common mistakes

Treating "50% markup" as "50% margin." The textbook trap. 50% markup is 33.3% margin — a meaningful 17-point gap.
Treating "100% markup" as "100% margin." 100% markup means doubling the cost, which is 50% margin (cost is half of price). 100% margin would require zero cost.
Pricing by "cost plus a percentage" without knowing what percentage you actually need. If the target margin is 40%, the markup is 67%, not 40%. Owners who add "40% on top of cost" thinking that gives them 40% margin systematically under-price.
Mixing markup and margin in the same conversation. Suppliers quote markup. Accountants report margin. If those numbers travel together without being labeled, decisions get made on the wrong basis.
Forgetting that the gap widens at higher numbers. At 10% markup the gap is 1 point. At 50% markup it's 17 points. At 100% markup it's 50 points. At 200% markup it's 133 points. Misreading the number gets more expensive, not less, as you scale up.

When markup is more useful, when margin is more useful

They answer different questions. Both belong in an owner's toolkit:

Markup is useful for pricing decisions. When you're looking at a cost and deciding what to charge, markup is the natural language. "I add 50% on top of cost" is a rule you can apply consistently across different products without doing margin math each time.
Margin is useful for measuring profitability. When you're looking at the P&L and asking "how much of every revenue dollar do I keep", margin is the natural language. It's also what bankers, buyers, and benchmarks all use.

The two aren't competing — they're different tools for different purposes. The mistake is using one number to answer the other's question.

The rules of thumb that work

A few markup-to-margin pairs worth memorising — these come up in pricing conversations constantly:

To hit 25% margin → mark up 33%
To hit 33% margin → mark up 50%
To hit 40% margin → mark up 67%
To hit 50% margin → mark up 100% (double the cost)
To hit 60% margin → mark up 150%
To hit 67% margin → mark up 200% (triple the cost)

The reference table on the calculator above shows these side-by-side and highlights whichever row is closest to your input.

FAQ

Why don't the two terms mean the same thing?

Because they have different denominators. Both measure the same dollar of profit, but markup divides by cost (the smaller number) while margin divides by price (the larger number). Same numerator, smaller denominator → larger percentage. That's why markup is always higher than margin (for any positive profit).

Is one "more correct" than the other?

No — they're both correct, they answer different questions. Margin is what almost everyone in finance and accounting uses to describe profitability, so it's the one that shows up on financial statements and benchmarks. Markup is what suppliers, distributors, and trades use for pricing rules of thumb. Knowing both, and being explicit about which one you're quoting, prevents the costly confusion.

Can margin ever exceed markup?

No. For any positive profit, markup is mathematically larger than margin. They're equal only at zero (selling at cost). For negative profit (selling at a loss), both are negative and markup is closer to zero than margin.

What about VAT, sales tax, or shipping?

The calculator works with pre-tax cost and pre-tax price. For trades and retail, that's typically how pricing decisions get made — tax is added at the end and isn't part of margin or markup. If your cost figure includes shipping or duty, treat that as part of cost; the math works the same way regardless of what cost includes, as long as you're consistent.

What if I'm a service business — does this still apply?

Yes. For service businesses, "cost" is your delivery cost (technician time, materials used on the job) and "price" is what you bill the customer. Markup-to-margin conversion works exactly the same. The only difference is that some service businesses don't think in per-unit terms — but a job, a billable hour, or a contract all have a cost and a price, and the same math applies.