Profitability / Free calculator
Ecommerce Profit Calculator
Build a transparent sales-to-contribution breakdown for one product unit or a business period, with optional operating overhead.
Set up your scenario
Let’s run the numbers.
Your result updates as you enter valid inputs. See how it’s calculated.
Use totals for the same business period throughout.
Understand the numbers
How this calculator works
Net revenue = gross sales − discounts − refunds. Contribution = net revenue − COGS − fees − fulfillment − returns costs − advertising − other variable costs. Contribution margin = contribution ÷ positive net revenue × 100. Operating profit is contribution minus explicitly supplied overhead; it excludes interest and income tax.
See the method in practice
Worked example
For a month with $10,000 gross sales, $200 discounts and $300 refunds, net revenue is $9,500. Costs of $3,000 + $1,400 + $900 + $100 + $1,200 + $100 total $6,700. Contribution is $2,800 (29.47%). If full overhead is $1,000, operating profit is $1,800. For a single unit, $40 sales minus $27 total variable costs leaves $13 contribution.
Assumptions and limitations
Use either amounts per one unit or totals for one period. Do not mix them. In per-unit mode overhead is an allocation, not business-wide operating profit. Enter gross sales before deductions, avoid subtracting refunds twice, and reverse returned COGS only where inventory value is actually restored. This is a management estimate, not a tax return.
A little help with the inputs
Input guide
Use consistent currencies, units and periods. Select a field for its definition.
Gross sales
Before discounts and refunds; exclude sales tax collected for authorities.
Discounts
Enter separately only if gross sales have not already been reduced.
Refunds
Refunded revenue, counted once.
Product costs / COGS
Net cost of goods sold after any valid returned-inventory cost reversal.
Marketplace / payment fees
Actual net fees after fee credits. No live fee rates are assumed.
Fulfillment and shipping
Variable pick, pack and delivery costs.
Returns-related costs
Incremental return shipping, processing and write-offs; exclude costs counted elsewhere.
Advertising
Ad costs allocated to this product or period, once.
Other variable costs
Other attributable costs; enter 0 when verified as none.
Allocated / period overhead (optional) (optional)
Leave blank if unknown. Enter the full overhead for the selected scenario to estimate operating profit.
Before you make your next move
Frequently asked questions
Can I call contribution net profit?
No. Contribution is before fixed overhead, financing and income taxes. Operating profit appears only when you explicitly supply overhead.
How do I handle advertising allocation?
Use one consistent documented allocation, such as SKU-attributed spend or a sales-based allocation. Do not add allocated advertising again as overhead.
Do I have to share my data or email address?
No. Core results and exports work without an account or email. An enquiry is optional, with a separate unchecked choice to share an aggregate summary. Raw report rows stay local.
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