Small Business Budget Calculator

The Small Business Budget Calculator is a free, no-signup tool that turns four numbers into a clear picture of whether your business is making money. You enter total revenue, fixed costs, variable costs and one-off expenses for a period, and it shows total expenses, net profit or loss, and how your spending splits across the three cost types. It is deliberately simple: no account, no spreadsheet, nothing to install, and about a minute of work.

What you can actually do with it

This is a single-screen calculator rather than an accounting system, so the useful part is how quickly it answers one question: what is left over?

• See net profit or loss immediately. Enter revenue and your three cost buckets and the result appears alongside, labeled clearly as a profit or a loss.
• Separate fixed from variable costs. Splitting rent and salaries from costs that move with sales volume is the distinction most informal budgets miss.
• Keep one-off expenses out of the trend. A new laptop or a legal fee gets its own field, so a single big purchase does not make a normal month look terrible.
• Read the expense breakdown as percentages. Each cost type is shown as a share of total spending, which is usually more revealing than the raw amounts.
• See the split as a chart. A pie chart of expense distribution makes it obvious at a glance if one category is swallowing everything.
• Test scenarios quickly. Change one figure and recalculate to see what happens if revenue drops fifteen percent or rent goes up.

Who it fits best

This is for sole traders, freelancers and owners of small businesses who are running things from a rough mental model or a messy spreadsheet and want a sanity check. It is also handy at the idea stage, before a business exists, when you want to know roughly what revenue you need to cover the costs you have sketched out.

If you already use proper accounting software, this will not tell you anything your reports do not. It is for the gap between having no numbers and having a real bookkeeping setup.

How to get the most out of it

• Pick one period and stick to it. Use monthly figures for every field, or annual for every field. Mixing an annual rent figure with monthly revenue is the easiest way to get a nonsense answer.
• Include your own pay in fixed costs. Owners routinely leave out their salary, which makes a business look profitable when it is really just underpaying you.
• Do not forget tax and irregular bills. Tax set-asides, annual insurance and software renewals are real costs. Divide the yearly amount across your periods and include it.
• Run it three times. A realistic case, a bad month and a good month. The gap between them tells you how much cash buffer you actually need.
• Copy the results somewhere. Nothing is saved when you close the page, so note the figures down if you want to compare month to month.

Alternatives to compare it against

For an ongoing budget rather than a snapshot, a spreadsheet you own beats any web calculator, because you can track months side by side and see trends. If you want the numbers to come from your actual bank feed instead of your memory, accounting software such as Xero, QuickBooks or Wave does this automatically as part of its reporting. And if the question is really about cash timing rather than profit, a cash flow forecast is the tool you want, since a profitable business can still run out of money. This calculator is the fastest option when you just need one honest number today.

This is a quick estimate to help you think, not a substitute for proper bookkeeping or advice from an accountant.

Further reading

• Budget vs Actual: 7 Best Tracking Tools 2024 — the next step when a one-off snapshot needs to become month-by-month tracking.
• Startup Business Expenses: What to Expect — a checklist so the cost fields do not miss the bills owners typically forget.
• 7 Essential Financial Management Tips for New Entrepreneurs — covers paying yourself and setting aside tax, both easy to omit here.
• For Business Owners: Choosing the Right Accounting Software — the Xero, QuickBooks and Wave options named in the alternatives above.
• Growing Too Fast? 7 Financial Signs You Need Bookkeeping Support Now — how to tell when a calculator has stopped being enough.

Have you used Small Business Budget Calculator?

One sentence is enough. Would you pick it again, and why or why not? We publish the critical reviews too — that is the point.