Break-even quantity estimates how many sales are required to cover a defined set of fixed costs under a stated contribution per sale. In a simple single-product model, divide fixed costs by selling price minus variable cost per unit. The denominator must be positive; otherwise each additional sale does not provide the contribution needed to cover those fixed costs. Whole-unit sales normally require rounding the calculated threshold upward. This is a planning relationship, not proof that demand will exist or that all real expenses were captured. Keep the planning period, product mix and cost assumptions explicit when using it to assess a reseller activity.
Break-even quantity and Credit capacity
Having enough credits to activate accounts does not establish that enough accounts will be sold to break even.
Contribution is not the selling price
If a sale brings in 30 currency units but incurs 18 of variable cost, it contributes 12 toward fixed costs under that model. Dividing fixed costs by 30 would ignore the variable outflow and understate the required sales. Include relevant per-sale charges consistently, and avoid counting the same cost as both a fixed expense and a variable expense in the formula.
Use a consistent period and sales mix
Monthly fixed costs belong with monthly sales assumptions. Several plans with different prices and costs require a stated mix or separate analysis rather than one arbitrary contribution figure. Support workloads and payment charges can change with volume too. Review whether the assumed unit economics remain reasonable at the proposed scale, especially if a supplier pack discount or staffing threshold changes costs.
Treat the threshold as conditional
The model says what quantity would cover included costs if its assumptions hold. It does not establish that customers will buy, that receipts arrive before bills or that unsold panel credits can be refunded. A negative or zero contribution needs an explicit result rather than a misleading finite break-even number. Compare realistic scenarios for price, cost and sales before relying on a single threshold.
An illustrative example
An illustrative model has USD 250 in fixed costs, a USD 30 sale price and USD 18 variable cost per sale. Contribution is USD 12, so 250 divided by 12 is about 20.83. At least 21 whole sales are needed to cover those included costs, assuming the price and cost assumptions hold.
Practical actions
- Use selling price minus actual variable cost as the contribution per sale.
- Keep fixed costs and sales on the same planning period.
- Round whole-sale thresholds upward and handle nonpositive contribution explicitly.