Cash Flow Calculator: See How Much Money You Actually Keep Each Month

Revenue is not the same as cash in the bank. A freelance business can be profitable on paper and still run out of money if income arrives late or expenses are front-loaded. A cash flow calculator shows the gap between what comes in and what goes out each month so you can plan for lean periods.

The tool compares your monthly income to your monthly expenses and shows net cash flow (income − expenses) and savings rate (net ÷ income). A positive number means you are building a buffer; a negative number means you are drawing on savings or credit. Run it monthly, and you will spot problems months before they become emergencies.

What Does This Tool Do?

Two inputs: monthly income and monthly expenses. The calculator computes net cash flow (income − expenses) and savings rate (net cash flow ÷ income × 100).

Income is money received in the month, not invoiced. Expenses are money paid out in the month, including taxes, software, rent, and personal draw if you treat it as an expense. For lumpy income, average the last 3–6 months or run two scenarios (lean month, average month). Net cash flow that is consistently negative means the business model is unsustainable at current rates or costs.

How to Use It (Step-by-step)

1
Enter your monthly income. Use money actually received in the month, not invoices sent. For lumpy income, use a 3- or 6-month average or run both a lean and an average scenario.
2
Enter your monthly expenses. Include business costs (software, rent, marketing, taxes) and any personal draw you treat as an expense.
3
Read net cash flow. Positive means you are building a buffer; negative means you are drawing on savings or credit.
4
Read savings rate. Compare to your target—many freelancers aim for 15–25% as a buffer and reinvestment fund.
5
Use Reset to run another scenario. Try raising rates or cutting an expense to see how net cash flow changes.

Key Features

Two inputs: monthly income and monthly expenses.

Net cash flow shown in currency with color coding (green for positive, red for negative).

Savings rate shown as a percentage so you can compare to a target.

Currency-agnostic: enter amounts in your local currency.

Instant calculation: results update as you type, no submit button.

No storage: runs in your browser, no data sent to a server.

Use Cases

Monthly review

track net cash flow each month to spot trends before they become problems.

Planning a rate increase

enter your new expected income to see how net cash flow improves.

Cutting an expense

enter a lower expense to see the effect on net cash flow and savings rate.

Lean-month planning

run a scenario with low income to see whether your buffer is enough.

Setting a savings target

aim for a savings rate (e.g., 20%) and use the tool to check progress.

Buying decision

model the effect of a new recurring expense on monthly cash flow before committing.

FAQ

Use received income for cash flow. Invoiced but unpaid amounts are accounts receivable—they matter for profit but not for cash on hand. If you want both views, run the calculator twice: once with received, once with invoiced.

Many freelancers aim for 15–25% as a buffer and reinvestment fund. The right number depends on your goals and risk: higher if you want to invest in growth or have variable income, lower if your income is stable and predictable.

That depends on how you structure your accounts. If you treat your personal draw as a business expense, include it. If you treat net cash flow as your draw, leave it out. Pick one convention and stick to it.

Use a 3- or 6-month average, or run two scenarios: a lean month and an average month. The lean-month scenario shows whether your buffer can absorb the worst case.

No. Profit is revenue minus expenses on an accounting basis. Cash flow is the actual movement of money in and out. A profitable business can have negative cash flow if income arrives late or expenses are paid early.

At least monthly, and more often if income is variable. Many freelancers check weekly during busy periods and monthly otherwise, so problems surface early.