Revenue is the starting point
Revenue is selling price multiplied by units sold in this model. It does not say how much you keep. A $10,000 month can be excellent or unprofitable depending on the costs behind those sales.
Use a consistent price basis. This calculator does not separate sales tax or VAT from an entered selling price, and does not calculate tax liabilities.
Profit accounts for the entered operating costs
Our monthly estimate subtracts unit costs, percentage fees, fixed fees per unit, and monthly fixed costs. At $10,000 revenue, $4,000 unit costs, $600 fees, and $2,000 overhead, pre-tax operating profit is $3,400.
Refunds, spoilage, advertising, or owner pay are not silently estimated. Add applicable operating amounts to the appropriate cost fields, keeping a note of what you included.
Why can cash be tight in a profitable month?
A retailer may pay for inventory before selling it. A freelancer may complete work before collecting an invoice. A payment processor may release funds later. None of those timing differences is modeled here.
Loan principal, equipment purchases, and changes in inventory can affect available cash without matching the operating costs in this simplified model. Use your records to build a separate cash-flow view.
Treat a scenario as a question
The price scenario asks what happens if price rises and volume stays the same. It is not evidence that customers will keep buying at the same rate. Compare a lower quantity too if demand might change.
Keep your assumptions visible, use realistic ranges, and revisit them with actual results. A useful calculator makes the arithmetic clear; it does not remove uncertainty from the business.