Methodology

Simple inputs, visible assumptions.

The calculator estimates contribution per order and monthly operating profit. It does not prepare tax returns or replace an accounting system.

Core formulas

• Revenue = product price + shipping charged.
• Variable costs = product or delivery cost + shipping cost + percentage fees + fixed fees + advertising.
• Take-home per order = revenue - variable costs.
• Margin = take-home per order / revenue.
• Monthly profit = take-home per order × monthly orders - fixed monthly costs.
• Break-even orders = fixed monthly costs / positive take-home per order.

What is excluded

Income tax, sales tax remittance, marketplace tax collection rules, currency conversion, chargebacks, refunds, inventory shrinkage, unpaid labor, financing costs, and one-off setup costs are not calculated unless you represent them in an input.

Fee presets

Platform presets are editable examples intended to shorten data entry. Marketplace terms change and can differ by country, seller type, product category, order source, and account history. Verify current terms in the relevant official documentation and your own payout statements.

Use limitations

Results are planning estimates, not promises. A positive scenario does not guarantee that sales will occur or that a business will be profitable. Use licensed professional advice for accounting, tax, investment, and legal decisions.

Last reviewed: September 10, 2026.