Start with an affordable testing limit
There is no daily budget that guarantees sales for every shop. Decide how much your business can spend on a test without relying on the test to pay for itself. Stock, delivery and cash flow still need funding. Choose a total testing limit and a period you can monitor. Dividing that limit by the number of days gives a starting daily allocation. For example, $140 across 14 days is $10 per day. This is an arithmetic example, not a recommendation or a promise of results.
Calculate an allowable cost per purchase
Revenue is not the amount available for advertising. Subtract product cost, fulfilment, payment charges, discounts and expected returns from the value of an order. An illustrative $40 order with $25 of direct costs leaves $15 before advertising and overheads. A $15 acquisition cost would use all of that contribution. Set a lower working limit if the business needs profit from the first order. Only include future repeat purchases when your own customer records support that assumption.
Do not fragment a small test
Budget gets harder to interpret when it is divided across many ad sets, languages and channels. Each part may receive too little activity to compare. Choose a clear product, an appropriate audience and a limited set of distinct creatives. In Flip, review the channel allocation and required minimums before payment. The proposal is adjustable. Adding platforms is not automatically an improvement when the total spending limit stays the same.
Use purchase evidence, not just attention
An image can attract clicks without selling the product. Review spend, purchases and cost per purchase first, with clicks as supporting evidence. Test checkout and complete the required tracking setup before a Sales campaign launches. Compare platform reporting with paid orders and check the selected reporting period. Different attribution methods can produce different totals. A single purchase is an early signal, not proof that the same cost will continue at a larger budget.
Compare scenarios before increasing the limit
Use the budget calculator to change click price and purchase conversion rate separately. At $10 a day, $0.50 per click and a 2% purchase rate, the arithmetic estimates 20 clicks and 0.4 purchases per day, or $25 per purchase. If your allowable acquisition cost is $10, that scenario is not sustainable. Improving the page or offer may matter more than increasing spend. These example values are not Meta benchmarks and the calculator does not retrieve auction forecasts.
Plan how to review and stop
Write down the testing limit, the business result you want and the checks you will make if the campaign spends without purchases. Confirm tracking, product availability, checkout and ad accuracy before diagnosing audience demand. Avoid constant changes based on a handful of clicks. Flip's weekly review distinguishes safe adjustments from whole-channel pauses that need customer confirmation. Campaign fees are separate from advertising spend, so include both in your overall plan.