What this calculator measures
Ecommerce profit depends on more than product cost. This model subtracts product cost, fulfillment, percentage payment or platform fees, advertising, and other operating cost from net sales revenue. The cost categories should cover the same period without overlap.
Use net revenue after discounts and returns when possible. Add warehouse labor, software, customer service, chargebacks, and overhead to the category that matches your planning method rather than leaving material costs outside the estimate.
Common use cases
Use this model when the inputs describe the same decision, period and customer or product scope.
- Estimate store profit after product cost, fulfillment, payment fees, advertising, and other operating cost.
- Use the result with the recorded inputs: Net sales revenue, Product cost / COGS, Fulfillment and shipping, Payment and platform fees, Advertising spend, Other operating costs.
- Compare multiple scenarios before making a ecommerce decision.
Formula
The model separates transaction-linked fees from entered dollar costs to show an all-in scenario profit.
Formula breakdown
- Use revenue, product cost, fulfillment, fees, advertising and returns from the same period.
- State whether overhead and owner labor are included.
Worked example
With $100,000 of net sales, $38,000 COGS, $12,000 fulfillment, 3.2% fees, $16,000 advertising, and $9,000 other costs, modeled total cost is $78,200. Estimated profit is $21,800 and profit margin is 21.8%.
Scenario comparison
$100,000 revenue less $35,000 product cost, $12,000 fulfillment, $3,000 fees and $20,000 ads leaves $30,000 before other modeled costs.
An extra $10,000 of returns and ad cost cuts that to $20,000.
How to interpret the result
A profitable period can still consume cash when inventory is purchased before sales or processors delay payouts. Pair the profit view with inventory and cash forecasts.
Segment results by product, channel, campaign, and customer type when averages hide large differences in returns, fees, acquisition cost, or margin.
What a good result looks like
Healthy store economics require positive contribution and enough remaining profit to cover overhead.
Review by channel and product, not just store-wide totals.
Common mistakes
- Omitting refunds, chargebacks or shipping subsidies.
- Mixing gross sales with net costs inconsistently.
When this metric can mislead you
Store-wide profit can hide loss-leading products or channels.
Inventory purchasing and cost-of-goods recognition can create different cash and profit timing.
How to use the result in a decision
Use it to test advertising, pricing and fulfillment decisions.
Pair profit analysis with cash flow and inventory turnover.
Assumptions and limitations
- Revenue and all dollar costs cover the same period.
- The percentage fee applies to all entered revenue.
- Cost categories are complete and not double counted.
- Inventory timing, tax, working capital, financing, and owner distributions are excluded.