Model revenue · Calculator
SaaS Pricing and Unit Economics Calculator
Model monthly revenue, contribution, operating surplus and break-even customers from your pricing and cost assumptions.
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What if
Sensitivity to your assumptions
| Price scenario | Monthly price | Monthly revenue | Monthly surplus / loss |
|---|---|---|---|
| 20% lower price | $40 | $4,000 | $2,000 |
| Entered price | $50 | $5,000 | $3,000 |
| 20% higher price | $60 | $6,000 | $4,000 |
What are SaaS unit economics?
Unit economics asks whether each customer covers their own cost and contributes to fixed costs. Contribution per customer is price minus variable cost; break-even is fixed costs divided by that contribution.
How the calculation works
Contribution per customer = price − variable cost. Monthly surplus = contribution per customer × customers − fixed costs. Break-even customers = fixed costs ÷ contribution per customer, rounded up.
Worked example
At $50 per month, 100 customers, $10 variable cost per customer and $1,000 fixed costs, monthly revenue is $5,000 and modeled surplus is $3,000. The model breaks even at 25 customers.
Assumptions and limitations
Use consistent monthly amounts. Include expenses you want modeled in your inputs. Taxes, financing, churn, new-customer acquisition costs and one-time expenses are not added automatically. A non-positive contribution per customer cannot cover positive fixed costs; no finite break-even is shown in that case.
Frequently asked questions
What is the difference between variable and fixed costs?
Variable costs grow with each customer: payment fees, hosting per account, support time. Fixed costs stay the same whatever the customer count: salaries, tools, rent.
Does the sensitivity table predict what happens if I change the price?
No. It holds the customer count constant to isolate the arithmetic. In practice a price change also changes how many people buy.
What does "modeled margin" mean here?
Monthly surplus divided by monthly revenue, after the variable and fixed costs you entered. It is not a tax or accounting margin.
Why is there no break-even point sometimes?
If each customer costs as much as they pay or more, adding customers never covers fixed costs. Raise the price or lower the variable cost first.
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