What Is Gross Profit Margin?
Gross profit margin is the percentage of revenue you retain after subtracting the direct cost of producing or purchasing the goods you sell. It is the most fundamental metric in e-commerce pricing.
Gross Margin (%) = (Selling Price − Cost of Goods) ÷ Selling Price × 100
For example: if you sell a product for $50 and it costs $20 to make or buy, your gross margin is 60% — you keep $0.60 of every dollar earned before paying for advertising, platform fees, and overhead. Use our Simple Margin Calculator to calculate this instantly.
Gross Margin vs Markup — What's the Difference?
Margin and markup measure the same profit dollar from two different perspectives:
| Metric | Formula | Based on | Example ($20 cost, $50 sell) |
|---|---|---|---|
| Gross Margin | (Sell − Cost) ÷ Sell | Selling price | 60% |
| Markup | (Sell − Cost) ÷ Cost | Cost price | 150% |
The key rule: a 100% markup does not equal a 100% margin. A 100% markup (doubling your cost) equals only a 50% margin. Confusing the two leads to systematic underpricing.
Why Profit Margins Matter for Online Sellers
- Platform fees erode margin fast. Etsy, eBay, and Amazon each take 6.5–15% of your sale. A 20% gross margin becomes barely profitable after fees.
- Discounts are catastrophically expensive at thin margins. A 20% discount on a product with a 30% margin reduces per-unit profit by 67%. Our Discount Impact Calculator shows exactly how many extra units you'd need to sell to compensate.
- Returns hit profit, not revenue. A 5% return rate can wipe out the entire net profit of a low-margin product line.
- Scaling thin margins just creates thin problems at scale. Volume helps absorb fixed costs but doesn't fix a fundamentally underpriced product.
Industry Benchmark Margins for E-commerce
| Category | Typical Gross Margin | Notes |
|---|---|---|
| Handmade / Craft (Etsy) | 50–70% | Higher margins justify labour time |
| Print-on-demand | 20–40% | Base cost varies by platform |
| Reselling / Vintage | 30–60% | Highly variable by sourcing skill |
| Amazon FBA (private label) | 25–45% | After referral + fulfilment fees |
| Dropshipping | 10–30% | Low margin, high volume model |
| Digital products | 70–95% | Near-zero marginal cost |
How Platform Fees Affect Your Actual Margin
- Etsy: 6.5% transaction fee on item + shipping, plus $0.20 listing fee per item.
- eBay: 13.25% final value fee on total sale (item + shipping) plus $0.30 per-order fee.
- Amazon FBA: 15% referral fee plus $3.22–$6.50+ fulfilment fees depending on size and weight.
Use our Marketplace Fee Calculator to model your real profit after fees for any platform.
How to Use Each MarginCalc Tool
Simple Margin Calculator
Enter cost and selling price to get gross margin, markup, and a contextual quality rating. Best for quick product pricing checks. → Open calculator
Marketplace Fee Calculator
Select your platform, enter item cost, selling price, and shipping details. Applies the exact fee formula for Etsy, eBay, or Amazon FBA to show real net profit. → Open calculator
Discount Impact Calculator
Before running a sale, enter your retail price, cost, and planned discount. Shows per-unit profit before and after, and how many extra units you must sell to match original profit. → Open calculator
Break-Even Calculator
Enter your fixed monthly overhead and average profit per unit. Shows how many units you must sell each month just to cover fixed costs. → Open calculator
Wholesale & Retail Pricing Calculator
Enter material and labour costs to generate industry-standard wholesale (2× cost, 50% margin) and retail/MSRP (4× cost, 75% margin) prices. → Open calculator