An operating business has one advantage over a new idea: actual data. Yet a revenue report alone does not explain why little cash remains. The free Business Reactor calculator brings sales, cost of sales, staffing, fixed expenses and funding into one dynamic model.
Use averages from the latest complete month. Record primary and secondary channels separately: store and online, direct sales and marketplace, workshop and field service. Any field that does not apply can remain at zero.
Signals the model can reveal
| Signal in the result | Likely problem area | What to investigate |
|---|---|---|
| Revenue grows but net profit does not | Cost of sales or variable expenses | Purchasing, discounts, delivery, marketing and waste |
| Gross margin is positive but the business loses money | Fixed costs | Team utilisation, rent, support and other commitments |
| One channel delivers volume but little contribution | Channel order value and expense | Price, commission, logistics and product mix |
| Profit is positive but cash is scarce | Working capital | Inventory days, supplier delay, reserve and borrowing |
| Required customers exceed capacity | Operating model | Service time, space, equipment and team size |
Break-even as a safety boundary
The calculator derives average contribution per customer and divides fixed costs by it to find break-even customer volume. Add the target profit and the model shows the flow required not merely to survive but to meet the owner’s objective.
The safety margin shows how far actual revenue stands above break-even revenue. A small margin means that a successful month may still conceal exposure to seasonality, the loss of a customer or a supplier price change.
Investment and payback without illusion
Renovation, equipment, software investment, inventory, prepaid rent and the cash reserve form the asset requirement. Loans and supplier delay appear as funding sources, not as profit. Estimated payback exists only when monthly net profit is positive.
Make the model a regular tool
- Update actual traffic, order values and unit costs every month.
- Compare the primary and secondary channels.
- Create a separate scenario before hiring, leasing or borrowing.
- Review target customers and safety margin, not net profit alone.
- Record every assumption that still needs evidence.
A dynamic model restores control. Instead of the vague feeling that “the business earns too little,” you get a specific number and a specific input that can be improved.
Test the actual performance of your business in the free calculator.
