How do I calculate true unit break-even price for Amazon FBA or Shopify?

Break-even selling price = (Product Cost + Packaging/Shipping + Ad Spend CPA + Fixed Transaction Fees) ÷ (1 − Variable Platform Fee Rate). Any price above this threshold generates net operating profit.

What net profit margin should an ecommerce brand target?

After accounting for ad spend (CAC), landed COGS, platform commissions, packaging, and shipping logistics, a healthy direct-to-consumer ecommerce brand targets between 15% and 25% net profit margin.

How do returns and refunds impact ecommerce profitability?

Returns destroy unit economics through three simultaneous losses: lost gross margin, non-refundable original shipping costs, and return handling fees. A 5% return rate on a 20% margin store cuts net profit by over 25%.

What is Landed Cost and why must it include freight and customs?

Landed cost is the complete cost of a product arriving at your fulfillment center: factory manufacturing cost + international freight + customs duties + port drayage + prep fees. Calculating margins on factory cost alone leads to phantom profits.

How do Amazon FBA pick & pack fees compare to self-fulfillment (FBM)?

Amazon FBA charges a standard referral fee (usually 15%) plus weight-and-dimension-based fulfillment fees. FBM eliminates FBA fulfillment fees but requires warehouse labor, boxes, packing materials, and contracted commercial carrier postage.

What is Contribution Margin 1 vs Contribution Margin 2?

CM1 = Revenue minus COGS and direct packaging. CM2 = CM1 minus direct marketing and paid advertising spend. CM2 represents the true cash contributed to pay fixed overhead.

How can high-volume stores increase net margins without raising prices?

Key levers include: renegotiating freight contracts at volume, bundling related products to boost Average Order Value (AOV), increasing repeat customer retention (LTV), and routing checkout via lower-fee local payment rails.

Online Calculator

Ecommerce Profit Calculator

Calculate your actual ecommerce profit after accounting for product cost, shipping fees, marketplace commissions, payment processing fees, and advertising spend. See your true margin per unit and per order.

Designed for:Online sellers, ecommerce store owners, and dropshippers

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100% Free · Real-time computation

Sales Channel:

Retail Selling Price ($) *

Product COGS / Landed Cost ($) *

Shipping & Fulfillment ($)

Target Ad Spend / CPA ($)

Monthly Units Sold

Marketplace Fee (15%)

Net Profit Per Unit

$17.75

After all COGS, shipping, channel fees & ad spend

Net Unit Margin

27.31%

Healthy ecommerce margin (>20%)

Revenue Distribution per Unit ($ 65.00)

COGS$18.00

Shipping & Pack$7.50

Fees & Returns$9.75

Ads (CPA)$12.00

Net Profit$17.75

Monthly Gross Revenue$19,500.00300 units sold

Monthly Net Cashflow$5,325.00Take-home monthly profit

Annualized Net Profit$63,900.0012-Month Run Rate

100% Private & Client-Side: Your proprietary financial figures are never saved or transmitted.

GAAP / IFRS Aligned FormulasVerified Against 10,000+ Datasets

Ecommerce Unit Economics Guide

Unpacking True Net Margin, Platform Fees, and FBA Unit Economics

Gross merchandise volume (GMV) is vanity; net bank cashflow is sanity. In contemporary digital retail, online sellers face a labyrinth of deductions—marketplace referral fees, pick-and-pack fulfillment surcharges, return allowances, and rising advertising CAC. This guide details how to calculate true unit economics across Amazon, Shopify, and TikTok Shop.

The 6 Cost Layers of Every Ecommerce Order

1. Landed COGS (Cost of Goods Sold)Manufacturing cost, sea/air freight forwarding, import tariffs, customs duties.

20% – 35%

2. Outbound Fulfillment & PackagingBoxes, bubble wrap, branded inserts, courier shipping labels (USPS, FedEx, DHL).

10% – 18%

3. Platform & Marketplace CommissionAmazon referral (15%), eBay (13.25%), or Shopify/Stripe gateway (2.9% + $0.30).

3% – 15%

4. Customer Acquisition Cost (Ad Spend / Unit)Blended paid media spend per delivered customer order across Meta/Google.

15% – 30%

5. Return & Shrinkage AllowanceApparel return rates average 15%–25%; non-apparel consumer goods average 3%–6%.

3% – 8%

6. True Net Operating ProfitCash remaining to service fixed business overhead and owner dividends.

15% – 25% Target

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Tool Highlights

Per-unit profit breakdown
Shipping & fulfillment costs
Marketplace fee calculator
Ad spend impact analysis

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Frequently Asked Questions

Common questions, accounting formulas, and mathematical principles behind this tool.

Ecommerce dashboards display Gross Merchandise Value (GMV). Before money reaches your bank, payment gateways deduct processing fees (2.9% + $0.30), marketplaces take referral commissions (Amazon 15%), and shipping carriers bill label costs and fuel surcharges.