Profit Margin Calculator

Profit margin answers a simple question: after every cost is paid, what share of each revenue dollar remains as profit? The formula is margin % = (revenue − costs) ÷ revenue × 100. Markup % = profit ÷ costs × 100 measures the same profit dollars but against cost instead of price. A 25% margin is not the same as a 25% markup — for identical profit, margin is always the lower percentage because price includes profit in the denominator. Confusing the two in a supplier negotiation can cost thousands.

Retailers, manufacturers, and SaaS companies track margin at different levels. Gross margin subtracts only direct costs — materials, fulfillment, hosting — from revenue. Net margin subtracts all operating expenses including rent, payroll, insurance, and software subscriptions. This calculator uses one combined cost field for simplicity. Split COGS from overhead yourself if you need gross margin for a single SKU or product line while keeping overhead in a separate spreadsheet.

Margin compression happens quietly when costs rise without a matching price increase. If a supplier raises material cost 8% and you hold shelf price flat, margin falls faster than the raw cost bump suggests because revenue stayed constant while the cost numerator grew. A business running 35% margin on $15,000 revenue keeps $5,250; the same cost increase on thinner margins hurts even more. Monitoring margin monthly — not just revenue — catches drift before it erodes an entire quarter.

Investors, lenders, and acquirers speak in margin because the percentage scales across revenue sizes. A shop with $15,000 monthly revenue at 35% margin keeps $5,250; at $150,000 revenue with the same margin, profit is $52,500. The percentage communicates operational efficiency independent of scale. Markup remains popular on the shop floor where buyers think in "keystone" pricing — doubling cost for 100% markup, which equals 50% margin — but finance teams almost always normalize to margin for comparisons.

Industry benchmarks vary so widely that a single "healthy" target misleads more than it helps. Grocery chains survive on single-digit net margins; software companies often report 70%+ gross margins before sales and marketing. Handmade goods on Etsy might target 30% to 45% after fees depending on category. Comparing your margin to a random blog post number is less useful than tracking your own trend quarter over quarter and benchmarking against direct competitors in the same niche and price band.

Margin guides pricing decisions when you know your cost structure. If total costs are $9,750 and you want 35% margin, required revenue = costs ÷ (1 − 0.35) ≈ $15,000 — exactly the default inputs here. Raising prices without understanding margin can push you out of the market; cutting costs without measuring margin hides whether savings actually reach the bottom line. Use this calculator as a snapshot, then stress-test with higher costs or lower revenue scenarios.

Worked example with defaults: $15,000 revenue and $9,750 total costs. Profit = $5,250. Margin = ($5,250 ÷ $15,000) × 100 = 35%. Markup = ($5,250 ÷ $9,750) × 100 ≈ 53.8%. If costs rise to $10,500 without a price change, margin drops to 30% — a five-point slide from a $750 cost increase alone. A 3% price increase to $15,450 with unchanged costs would restore margin to about 36.9%, showing how small pricing moves interact with cost shocks.

Figures here are pre-tax business planning estimates — not tax or financial advice. Net profit before income tax is what the IRS generally treats as taxable business income for sole proprietors and pass-through entities, but deductions, credits, and entity type change the final bill. Consult IRS Publication 334 for small business tax basics or a qualified accountant for reporting and expense classification questions specific to your situation.