Calculate profit, loss, profit margin, ROI, and break-even points with multi-currency support and platform-specific fees.
Understanding platform fees is the single most important factor in calculating true product profitability. Each marketplace charges fees in different ways — some take a percentage of every sale, others charge monthly subscriptions, and most charge both.
| Fee Type | Amazon FBA | Shopify Basic | eBay (Standard) |
|---|---|---|---|
| Monthly Platform Fee | $39.99 (Professional) | $39/month | Free (250 listings) |
| Referral / Commission | 8%–17% per sale | None | 10%–15% per sale |
| Fulfillment Fee | $3.22–$6.10 per unit | Self-managed | Self-managed |
| Transaction / Processing | 2.9% + $0.30 | 2.9% + $0.30 | 2.99% (managed payments) |
| Storage Fee | $0.78–$2.40 /ft³/mo | None | None |
| Return Processing | $2.45–$6.00 per return | Store policy | Seller responsibility |
| Advertising (optional) | Sponsored Products (CPC) | Shopify Ads / Meta | Promoted Listings |
| Apparel Referral Rate | 17% | None | ~12.9% |
Source: Amazon Seller Central, Shopify Pricing page, eBay Seller Center. Fees verified February 2026.
A "good" profit margin varies significantly by product category, platform, and fulfillment method. The benchmarks below represent net margin after all platform fees, shipping, returns, and advertising — not gross margin.
| Category | Gross Margin Target | Net Margin (Amazon FBA) | Net Margin (Shopify) | Avg. Return Rate |
|---|---|---|---|---|
| Lingerie & Intimates | 60–70% | 18–28% | 38–50% | 20–30% |
| Apparel (General) | 50–65% | 12–22% | 28–42% | 15–25% |
| Beauty & Personal Care | 60–75% | 20–32% | 40–55% | 5–10% |
| Jewellery & Accessories | 70–85% | 25–40% | 50–65% | 10–15% |
| Home & Kitchen | 40–55% | 10–20% | 25–38% | 8–12% |
| Electronics | 15–30% | 5–12% | 12–22% | 12–18% |
| Sporting Goods | 35–50% | 8–17% | 22–35% | 6–10% |
| Books & Media | 60–80% | 15–25% | 50–65% | 3–5% |
Net margin figures assume average advertising spend of 8–12% of revenue.
Returns are the hidden profit killer in fashion e-commerce. The average return rate across all Amazon categories is 5–8%, but for apparel it rises to 15–25%, and for lingerie and intimate apparel it commonly reaches 20–35%. Each returned unit costs you the original shipping fee, return processing fee ($2.45–$6.00 on Amazon FBA), restocking labour, and potential repackaging costs.
| Return Rate | Revenue per 100 Units | Return Processing Cost | Adjusted Net Margin | Category Example |
|---|---|---|---|---|
| 5% (Low) | $4,750 | ~$25 | ~18.5% | Books, consumables |
| 10% (Average) | $4,500 | ~$50 | ~17% | Home & Kitchen |
| 20% (Fashion avg.) | $4,000 | ~$100 | ~13.5% | Apparel, shoes |
| 28% (Lingerie avg.) | $3,600 | ~$140 | ~10% | Lingerie, intimates |
| 35% (High) | $3,250 | ~$175 | ~7% | Fashion accessories |
ROAS (Return on Ad Spend) measures revenue earned for every dollar spent on advertising. But ROAS alone does not tell you whether your advertising is profitable — you need your minimum breakeven ROAS, which is determined by your product's profit margin.
Min ROAS = Selling Price ÷ Net Profit Per Unit
Or: Min ROAS = 1 ÷ Net Profit Margin %
Example A — Apparel seller (20% net margin):
Selling Price: $50 | Net Profit: $10 | Min ROAS = $50 ÷ $10 = 5.0x
Example B — Beauty seller (35% net margin):
Selling Price: $40 | Net Profit: $14 | Min ROAS = $40 ÷ $14 = 2.86x
| Net Profit Margin | Min ROAS Required | Profitability Buffer | Category Typical Range |
|---|---|---|---|
| 10% | 10.0x | Fragile — any cost increase is critical | Electronics, dropshipping |
| 15% | 6.7x | Low — requires tight ad management | General apparel |
| 20% | 5.0x | Moderate — manageable with good targeting | Fashion, lingerie |
| 25% | 4.0x | Healthy — allows campaign experimentation | Beauty, accessories |
| 33% | 3.0x | Strong — high tolerance for ad inefficiency | Premium jewellery, DTC brands |
| 50% | 2.0x | Excellent — very resilient to ad costs | Luxury, high-AOV products |
Profit margin and markup both measure profitability but use different bases. Confusing the two is one of the most common pricing mistakes — especially because platform fees are calculated as a percentage of selling price (margin-based), not cost.
| Metric | Definition | Formula | When to Use |
|---|---|---|---|
| Markup | Percentage added above cost to set selling price | (SP − Cost) ÷ Cost × 100 | Setting initial prices from a cost-plus model |
| Margin | Percentage of selling price that is profit | (SP − Cost) ÷ SP × 100 | Reporting profitability; aligns with platform fee structures |
Example: A product bought for $30 and sold for $50 has a markup of 67% but a profit margin of only 40%. Amazon's 17% apparel referral fee means 17% of your entire selling price — not 17% of your markup.
| Revenue | Platform Fees | Total Cost | Net Profit | Margin % |
|---|---|---|---|---|
| $1,000 | $150 (Amazon) | $700 | $150 | 15% |
| $2,500 | $375 (Amazon) | $1,750 | $375 | 15% |
| $1,000 | $90 (Shopify) | $600 | $310 | 31% |
| $5,000 | $450 (Shopify) | $3,000 | $1,550 | 31% |
| $10,000 | $1,300 (eBay) | $7,500 | $1,200 | 12% |
| Expense Type | Example | Impact on Profit |
|---|---|---|
| Product / COGS | Manufacturing, wholesale, raw materials | Direct and largest cost driver |
| Platform Fees | Amazon referral, eBay final value, Shopify subscription | Typically 10–25% of revenue |
| Fulfillment / Shipping | FBA fees, carrier costs, packaging | High for large/heavy items |
| Marketing & PPC | Amazon Sponsored Products, Meta Ads, Google Shopping | Must be tracked vs ROAS threshold |
| Returns & Restocking | Return processing, repackaging, disposal | 8–15% margin erosion in fashion |
| Payment Processing | Stripe, PayPal, card fees | Typically 2.5–3.5% of revenue |
| Storage & Overheads | FBA storage, warehouse rent, staff | Grows with inventory scale |
For managing profitability across a full product catalogue, Excel is the right tool. Here is a structured approach to building an e-commerce P&L tracker.
Create columns for: Product Name, ASIN/SKU, Buying Price, Packaging, Shipping, Marketing, Platform Fee, Selling Price, Total Cost, Net Profit, Profit Margin %, ROI %, and Min ROAS.
Use a SUM formula across all cost columns. Include a returns buffer column (e.g., Buying Price × 0.25 for a 25% return rate category) as a separate cost line.
Net Profit = Selling Price − Total Cost. Add conditional formatting to highlight negative cells in red so loss-making products are immediately visible.
Profit Margin = (Net Profit ÷ Selling Price) × 100. A $10 product at 40% margin outperforms a $100 product at 8% margin on the same inventory investment.
ROI = (Net Profit ÷ Total Cost) × 100. Prioritise products with both high ROI and high margin. Low ROI with high margin typically means high cost.
Min ROAS = Selling Price ÷ Net Profit. Products with Min ROAS above 8x are high-risk for advertising. Prioritise ad spend on products with Min ROAS below 4x.
Profit margin and markup both measure profitability, but they use different denominators. Profit margin is (Net Profit ÷ Selling Price) × 100. Markup is (Net Profit ÷ Cost Price) × 100. For a product bought at $30 and sold at $50: markup = 67%, but margin = only 40%. Amazon referral fees are based on selling price, so always model profitability in margin terms on marketplace platforms.
A good net profit margin for Amazon sellers — after all fees, shipping, advertising, and returns — is typically 15–25%. Margins below 10% are fragile. For apparel and lingerie, the above-average return rate of 20–30% means you need a higher gross margin (55–65%) to absorb return processing costs, yielding a net margin of 18–28% after all fees.
Amazon FBA fees reduce margin through three main charges: referral fee (8–17% of selling price), per-unit fulfilment fee ($3.22–$6.10 for standard-size items), and monthly storage fees ($0.78–$2.40/ft³). Combined, these typically consume 25–35% of your selling price before product costs are factored in — which is why a gross margin above 50% is generally required to generate meaningful net profit.
ROAS (Return on Ad Spend) is revenue earned per dollar of ad spend. Your minimum profitable ROAS = Selling Price ÷ Net Profit Per Unit. If you sell at $50 and net $10 after all fees, your minimum ROAS is 5.0x — any campaign below this reduces profit. Products with higher margins have lower minimum ROAS requirements and are more resilient to ad cost increases.
Return rates are the most commonly overlooked cost in fashion e-commerce. Average Amazon return rate is 5–8%, but apparel rises to 15–25%, and lingerie can reach 20–35%. Each returned unit incurs return shipping or FBA processing ($2.45–$6.00/unit), inspection, repackaging, and potential inventory downgrade. Lingerie sellers should target a 60%+ gross margin to absorb these return-related costs.
Break-Even Units = Fixed Costs ÷ Net Profit Per Unit. If you pay $39/month for Shopify and net $13 profit per unit, you must sell 3 units monthly just to cover your subscription. Break-even analysis is critical during product launch phases when advertising costs are elevated. The calculator above shows break-even units automatically when a fixed fee is entered.
Shopify charges no commission per sale but requires a $39–$399/month subscription plus 2.9% + $0.30 processing per transaction. Amazon charges 8–17% referral fee per sale plus FBA fulfilment fees but provides built-in traffic. For 100 sales/month at $50 average, Amazon fees ≈ $1,050 vs Shopify fees ≈ $186 — but Shopify requires you to generate traffic through advertising and SEO.
Yes. The calculator supports GST rates of 0%, 5%, 12%, 18%, and 28%. For Indian apparel, the applicable rate is typically 5% (garments under ₹1,000) or 12% (above ₹1,000). Lingerie is generally taxed at 5%. Toggle 'GST Inclusive' to extract GST from the entered selling price, or leave it unchecked to add GST on top of your base price.
Required Selling Price = Total Cost ÷ (1 − Target Margin %). If your all-in cost is $30 per unit and you want 25% net margin, you need at least $30 ÷ (1 − 0.25) = $40. However, platform fees increase with price making this circular — use the calculator directly: enter your costs and trial selling prices until the margin matches your target.
Yes. The calculation history panel saves your last 10 calculations showing selling price, net profit, margin %, and ROI. Click any history entry to reload its selling price. For efficient multi-product comparison, set a base configuration for platform and shipping costs, then vary only buying price and selling price between products. For 10+ SKUs, use the Excel P&L template approach described in the guide above.
This Product Selling Calculator is independently developed and maintained by Raviraj Bhosale (Founder, VIP Calculator). The calculation engine follows standard financial modelling practices used in e-commerce profitability analysis.
Calculation Methodology
Official Fee Sources (2026)
Amazon Seller Fees — Official Amazon Structure ↗
eBay Selling Fees — eBay Seller Center ↗
Shopify Plans & Fees — Shopify Official Pricing ↗
🔒 Privacy: All calculations run locally in your browser. No data is transmitted or stored on any server.
Last Reviewed: For informational purposes only. Always verify current fee schedules directly with your selling platform before making pricing decisions.
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Calculate profit margins, ROI, and cost breakdown for your products across global marketplaces