Find the customer and revenue point where a SaaS business breaks even
A subscription business reaches operating break-even when monthly contribution margin covers monthly fixed costs. Recovering startup investment is a separate milestone, so this calculator reports both the steady-state customer threshold and a growth-based startup-cost payback projection.
How to use this calculator
Enter monthly fixed costs, one-time startup costs, average monthly price, variable cost per paying customer, current customers, expected net monthly customer growth, and a forecast period. Use averages that reflect discounts, refunds, payment failures, and plan mix.
How to interpret the result
Contribution margin is the amount each customer provides toward fixed costs and profit. Break-even customers is rounded up to a whole customer. Current monthly profit may be negative even when the growth forecast eventually recovers startup costs.
Decision checks
Validate gross margin by plan, churn, acquisition cost, support workload, infrastructure scaling, annual versus monthly billing, cash collection, and founder compensation. A revenue target without retention and cash timing can misrepresent business health.
Compare realistic scenarios
Run a conservative case with lower price, higher variable cost, and slower net growth; a central case based on recent cohorts; and a capacity case that adds hires or infrastructure step-costs. Update fixed costs when growth requires another cost tier.
Limitations and important context
The model assumes one blended price, one blended variable cost, constant percentage customer growth, immediate monthly revenue, and unchanged fixed costs. It is not an accrual-accounting statement, valuation model, or substitute for cohort-based forecasting.
The US Small Business Administration explains how to calculate startup costs and provides guidance to manage business finances. Use those records to support the assumptions entered here.