What is profit margin and how is it calculated?

Profit margin — more precisely, gross profit margin — measures how much of each dollar of revenue remains after subtracting the direct cost of goods sold (COGS). The formula is: Margin (%) = (Revenue − Cost) ÷ Revenue × 100. A 40% margin means 40 cents of every dollar of revenue is gross profit. Margin is always expressed as a percentage of revenue, which distinguishes it from markup.

What is the difference between margin and markup?

Both measure profitability but use different bases. Margin divides profit by revenue: a product that costs $60 and sells for $100 has a 40% margin (($100−$60)÷$100). Markup divides profit by cost: the same product has a 66.7% markup (($100−$60)÷$60). This distinction is critical — pricing based on the wrong one leads to systematic under- or over-pricing. Most retailers and e-commerce sellers price using margins; many manufacturers use markup.

What is a good profit margin for a US business?

It depends heavily on industry. According to NYU Stern School data, net profit margins by sector range from roughly 2–5% for grocery and food retail, 5–10% for general retail and manufacturing, 10–20% for software and technology, and 20–40%+ for pharmaceuticals and financial services. As a rule of thumb, a gross margin above 50% is considered strong for product businesses; below 20% is thin and leaves little room for operating expenses. Service businesses often operate at 60–80%+ gross margins.

How do I convert markup to margin?

Use the formula: Margin = Markup ÷ (1 + Markup) where markup is expressed as a decimal. For example, a 66.7% markup = 0.667 in decimal: 0.667 ÷ (1 + 0.667) = 0.4 = 40% margin. To convert margin to markup: Markup = Margin ÷ (1 − Margin). A 40% margin = 0.4: 0.4 ÷ (1 − 0.4) = 0.667 = 66.7% markup.

What is gross margin vs net margin?

Gross margin subtracts only the direct cost of goods sold from revenue — labor, materials, and direct production costs. It does not include operating expenses like rent, salaries, marketing, or taxes. Net margin (or net profit margin) subtracts all expenses including operating costs, interest, and taxes. For a business earning $1M revenue with $400K COGS and $300K operating expenses and 21% corporate tax: gross margin = 60%, net margin ≈ 23.7%. Use this calculator's overhead and tax fields to model net profit.

What is break-even analysis?

Break-even analysis identifies the number of units you must sell to cover your fixed costs (overhead) with zero net profit. The formula is: Break-Even Units = Fixed Overhead ÷ Gross Profit per Unit. If your product sells for $100, costs $60 (40% margin, $40 gross profit per unit), and your monthly overhead is $8,000, you must sell 200 units per month to break even. Every unit above 200 adds $40 in profit. Enter your overhead in the calculator to see your break-even automatically.

What is ROI and how does it relate to margin?

ROI (Return on Investment) measures profit as a percentage of cost invested — it's mathematically identical to markup. If you invest $60 in a product and sell it for $100, your ROI is ($40 ÷ $60) × 100 = 66.7%. Margin measures return as a percentage of revenue (what you receive); ROI measures it as a percentage of cost (what you invest). Investors and finance teams often prefer ROI; pricing and sales teams typically use margin.

How does the US corporate tax rate affect net profit?

The US federal corporate income tax rate is a flat 21% since the Tax Cuts and Jobs Act of 2017. State corporate taxes add another 0–12% depending on the state (Iowa is highest; Nevada, Wyoming, and South Dakota have no state corporate income tax). This calculator's Tax Rate field lets you enter a combined federal + state rate for your situation. Small businesses structured as pass-through entities (LLCs, S-Corps) pay individual income tax rates (10–37%) instead.

Can I use this for e-commerce pricing?

Yes. Enter your landed cost (product cost + shipping + tariffs + marketplace fees) as your cost input. For Amazon FBA products, total fees typically run 30–40% of selling price (referral fee + FBA fulfillment fee), so if you sell an item at $30 with $12 in Amazon fees and $6 in product cost, your true cost is $18 for margin purposes, giving you a 40% margin on $30 revenue. Use the bulk calculator to compare margins across your entire product catalog.

What is a healthy target margin for retail pricing?

Traditional retail uses a keystone markup — doubling the wholesale cost — which produces a 50% gross margin. This margin must cover store rent, staff, inventory shrink, and payment processing (2–3%) before yielding net profit. Modern e-commerce requires margins of 40–70%+ to remain profitable after platform fees, paid advertising (often $5–15 CAC per order), and return rates. Use the Margin Comparison table in this calculator to quickly see revenue and profit at different margin targets for your specific cost.

Margin Calculator — Free Profit Margin & Markup Calculator

How to Use the Margin Calculator

Confusing margin and markup is one of the most costly pricing errors a business can make. A product priced at a "50% markup" over cost actually has only a 33.3% margin — and if your operating model requires a 50% margin to be profitable, you are systematically underpricing every single product. This calculator eliminates that confusion by letting you solve for whichever variable you're missing, using the correct formula every time.

Choosing the Right Calculation Mode

The five-button mode selector at the top changes which values are inputs and which are calculated outputs. The highlighted (read-only) fields are computed automatically from your inputs.

Find Revenue (Margin) — You know your cost and target margin percentage. The calculator finds the selling price. This is the most common pricing scenario for retailers and e-commerce sellers who start with cost and set margin targets by category.

Find Revenue (Markup) — You know your cost and the markup percentage you want to apply. The calculator finds the selling price. Manufacturers and wholesalers often work in markup terms; this mode converts markup to a selling price and shows the equivalent margin.

Find Cost — You know your selling price and target margin. The calculator back-solves for the maximum cost you can pay to hit that margin — useful for buyers and procurement teams negotiating supplier pricing.

Find Margin & Markup — You know both revenue and cost and want to see the resulting margin, markup, and profit. This is the reporting mode — enter actual sales data and see what margins you're achieving.

Bulk / Multi-Product — Enter multiple products with individual costs, target margins, and unit quantities. The calculator shows per-product and portfolio-level results — total revenue, total profit, and blended margin across your full product mix.

The Core Formulas

Gross Margin (%) = (Revenue − Cost) ÷ Revenue × 100 Markup (%) = (Revenue − Cost) ÷ Cost × 100 Revenue = Cost ÷ (1 − Margin ÷ 100) Cost = Revenue × (1 − Margin ÷ 100) ROI (%) = (Revenue − Cost) ÷ Cost × 100 [same as Markup]

Margin and markup are related but not interchangeable. At a 40% margin, the markup is 66.7%. At a 50% markup, the margin is 33.3%. The Margin Comparison table at the bottom of the calculator shows revenue, profit, and markup at 10 standard margin levels for your specific cost — allowing instant visual comparison without recalculating.

Step-by-Step Example

Sarah runs an e-commerce store selling handmade candles. Each candle costs her $8.50 in materials and packaging. She targets a 55% gross margin.

Using "Find Revenue (Margin)" mode: Revenue = $8.50 ÷ (1 − 0.55) = $8.50 ÷ 0.45 = $18.89 selling price. Gross profit = $18.89 − $8.50 = $10.39. Markup = $10.39 ÷ $8.50 = 122.2%.

She sells 500 candles per month with $2,000 in monthly overhead (Etsy fees, shipping supplies, studio rent). Break-even = $2,000 ÷ $10.39 = 193 units. At 500 units, profit before tax = (500 × $10.39) − $2,000 = $3,195. At a 15% self-employment tax rate, net profit = $3,195 × (1 − 0.15) = $2,716/month.

Break-Even Analysis Explained

Break-even analysis answers the question: how many units do I need to sell before I start making money? Every sale below break-even is loss-making; every sale above is profit. The formula is straightforward: divide your total fixed overhead by the gross profit per unit. Fixed overhead includes anything that doesn't change with volume — rent, salaries, software subscriptions, insurance, and loan payments.

Variable costs (direct materials, shipping, platform fees) are already embedded in your COGS figure. Don't include them in the overhead field — only fixed costs belong there.

Gross vs Net Margin: What the Tax and Overhead Fields Add

Gross margin tells you how profitable your product is before operating costs. Net margin — what you keep after overhead and taxes — is the number that matters for business viability. Enter your total fixed overhead (monthly or annually, as long as your unit count matches the same period) and your applicable tax rate to see the full picture. The US federal corporate tax rate is 21% flat; most states add 3–12%. S-Corp and LLC pass-through income is taxed at individual rates, which range from 10% to 37%.

Common Pricing Mistakes

The most frequent error is pricing using markup when the business model requires a margin target — resulting in systematic underpricing. A second common mistake is omitting transaction fees, payment processing (2.9% + $0.30 for Stripe/PayPal), and marketplace commissions (Amazon charges 8–17%) from COGS, making margins look higher than they are. A third mistake is setting a single margin target across all products rather than recognizing that high-volume, low-margin anchor products can coexist with high-margin specialty items to optimize portfolio profitability.

Disclaimer

Results are for informational and business planning purposes only. Tax calculations are estimates based on inputs provided and do not constitute tax advice. Consult a licensed CPA or tax professional for your specific situation. US corporate tax rates and state rates referenced reflect current law and are subject to change.

Margin Calculator