# Can My SaaS Idea Make Money?

URL: https://www.paydude.io/resources/tools/can-my-saas-idea-make-money-calculator
Type: Free interactive calculator
Summary: Enter your price, expected customers, cost to serve and fixed expenses. See profit, margin, ARR and the customer count where you break even.

Four inputs are enough to know whether an idea can work. The output leads with profit rather than revenue, because a business grossing $12,500 a month and spending $12,000 is not the company the revenue figure suggests.

## Summary

Contribution per customer — price minus cost to serve — decides whether volume helps at all. If contribution is negative, every new customer loses money and scale makes it worse. Break-even is fixed expenses divided by contribution, not by price. This is arithmetic, not a forecast: it says nothing about whether you can reach the customer count.

## The number that decides everything

Contribution margin is price minus the cost of serving one customer. At $50 with $8 of hosting, support and API cost, each customer contributes $42 toward fixed expenses.

```text
contribution   = price - cost to serve
               = $50 - $8 = $42

break-even     = fixed expenses / contribution
               = $4,000 / $42 = 96 customers
```

Note it is not $4,000 ÷ $50 = 80. Using price instead of contribution understates break-even, and the error grows as cost to serve rises.

## Three ways an idea fails here

**What the output is telling you**

| Result | What it means | What to change |
| --- | --- | --- |
| Negative contribution | Each customer loses money | Price or cost to serve — volume cannot help |
| Positive contribution, negative profit | Model works, not enough customers yet | Reach break-even, or cut fixed costs |
| Thin margin at your customer ceiling | Works only at scale you may not reach | Raise price or narrow the audience |

The first is fatal and the only one that cannot be solved by growing. The other two are timing and ambition problems.

> **What this deliberately ignores:** Customer acquisition cost and churn. Both decide whether you ever reach the customer count you entered — and both are the usual reason a viable-looking model does not become a business.

## Sanity-check your inputs

- **Cost to serve** should include hosting, per-customer APIs, support time and payment fees. Payment fees alone are 3–4% of a typical plan.
- **Fixed expenses** should include your own salary if you intend to take one, or the number is not a real profit figure.
- **Customer count** is the input most likely to be optimistic. Halve it and see whether the answer survives.

If the model only works at your most optimistic customer number, it does not work yet.

**Cut one line of cost to serve** Payment fees are per-customer COGS, and they are the easiest line to lower. — [See Paydude pricing](https://www.paydude.io/pricing)

## Frequently asked questions

### What should I include in cost to serve?

Everything that rises when you add one customer: hosting and infrastructure, per-use third-party APIs, support time, and payment processing fees. Payment fees alone are typically 3–4% of a monthly plan and are the line most often forgotten.

### Should I include my own salary in fixed expenses?

If you intend to take one, yes — otherwise the profit figure is not really profit, it is just what is left before paying yourself. The founder salary calculator works the requirement out properly.

### Why is break-even higher than fixed expenses divided by price?

Because each customer costs something to serve, so only the contribution — price minus cost to serve — is available to cover fixed expenses. With a $50 price and $8 cost to serve, you need 96 customers to cover $4,000, not 80.

### What is a good net margin for SaaS?

Profitable bootstrapped SaaS commonly runs 20–40% net. Venture-backed companies frequently run negative by choice, spending gross profit on growth. Neither is right or wrong — but the number should be a decision rather than an accident.