What's the simplest way to calculate break-even for a small business?

Add up your monthly fixed costs — the bills that come in whether you sell anything or not. Then work out your contribution margin, which is the percentage of each sale left after variable costs like materials, merchant fees, and direct labour. Divide fixed costs by contribution margin and you have your break-even revenue. If your fixed costs are $40,000 a month and your contribution margin is 50%, your break-even is $80,000. Below that you lose, above that you profit. An hour with your last three months of books will get you a solid answer.

What's the difference between fixed and variable costs?

Fixed costs exist regardless of sales volume. Rent, salaries, software subscriptions, insurance, loan repayments, and fixed contractor retainers are the usual ones. Variable costs scale with each sale. Raw materials, merchant fees, direct labour on a job, commissions, and delivery costs are variable. Some costs are mixed — a phone plan with a base fee and call charges — and you split those as best you can. The point is not accounting precision. It's understanding which costs you're locked into each month versus which ones only happen when you make a sale.

Should I recalculate break-even every month?

Calculate it properly once a year, with a full audit of fixed and variable costs. Then do a light review quarterly — have any fixed costs crept up, have margins moved, did a new hire shift the number? Month-to-month, the break-even number itself doesn't move much, but your actual revenue does, so what you're really tracking weekly is the gap between revenue and break-even. That gap tells you whether this month is heading for a profit, a loss, or a flat result, and it's the most useful leading indicator a small business owner can have on their desk.

How do systems change the break-even point?

Systems can move any of the three levers. Better supplier terms and tighter production lower variable costs, which pushes contribution margin up and break-even down. Consolidating software, renegotiating rent, or replacing a contractor retainer with documented in-house process lowers fixed costs directly. And better sales systems increase volume without increasing break-even, so every additional dollar flows to profit. When you know your break-even, you can calculate the financial value of each system you build, which turns systemisation from a nice-to-have into a measurable investment.

How to Calculate Your Business Break-Even Point

Most business owners could not tell you their break-even number if you woke them up at 3 AM.

They know the rough direction. Sales are up or down. The bank balance feels okay or it doesn't. But the actual number — how much the business has to generate each month just to keep the lights on — is usually a guess.

That is a problem. Because the break-even number is the single most useful piece of financial information you own. It tells you what your machine costs to run. It tells you which months are working and which aren't. It tells you which systems will move the needle, and which ones are a waste of time.

This article walks you through how to calculate it properly, in under an hour, with nothing more than a spreadsheet. And then how to actually use it, which is the part most accounting articles skip.

Why most owners avoid this number

Two reasons.

First, it feels like accounting work, and accounting feels like homework. Most owners outsourced the accounting years ago and have quietly let the instinct for the numbers atrophy.

Second, if you don't know the number, you don't have to face it. Not knowing is a form of comfort. The moment you know your break-even is $85,000 a month and you're sitting at $72,000, you have a problem you cannot unsee.

I get the impulse. I also think it's the wrong trade. The number is not a judgement. It's a compass. Until you know which direction is north, every decision about where to invest your time is a guess.

What break-even actually means

Break-even is the revenue you have to generate in a period before you start making a profit.

Below it, you are losing money. Above it, you are making money. On it, you are exactly flat — the business covered its costs and nothing more.

Three inputs. That's all the maths.

Fixed costs. What you pay regardless of how much you sell. Rent, software, salaries, insurance, your own drawings if you take one, loan repayments. The expenses that show up whether you make $0 or $100,000 of revenue this month.
Variable costs. What you pay per unit of sale. Raw materials, merchant fees, direct labour on the job, commissions, delivery. These scale with revenue.
Contribution margin. The percentage of each sale left over after variable costs. If you sell something for $100 and it cost $40 in variable costs, your contribution margin is 60%.

Once you have those, the formula is:

Break-even revenue = Fixed Costs ÷ Contribution Margin

If your fixed costs are $50,000 a month and your contribution margin is 40%, your break-even is $125,000 ($50,000 ÷ 0.40). Below $125,000 in revenue, you are losing money. Above it, you are making money at the rate of 40 cents per dollar.

That's it. That's the maths.

The one-hour calculation

Here is the fastest reliable way to do this.

Open your last three months of bookkeeping, whichever tool you use. Xero, QuickBooks, MYOB, a shoebox.

One-Hour Break-Even Calculation

Three months of bookkeeping and a spreadsheet. That's it.

Trigger: New financial year or quarterly review | Duration: 1 hour | Owner: Business owner (with bookkeeper handy)

Step 1 (15 min). List every expense across the three months. For each, ask: does this cost exist whether we sell zero or a million? Mark it fixed or variable. Split edge-case items (like a phone bill with base fee plus call costs) as best you can.
Step 2 (10 min). Average your monthly fixed costs across the three months. That's your fixed cost number.
Step 3 (15 min). Average your monthly variable costs. Divide by average monthly revenue to get variable cost as a % of revenue. Subtract from 100% to get your contribution margin.
Step 4 (5 min). Divide fixed costs by contribution margin. That's your break-even revenue.
Step 5 (15 min). Sanity-check against the last 12 months of actual revenue. Does it explain the profitable months and the loss months? If not, revisit categorisation.

Result: You now know something 80% of small business owners don't — the exact revenue floor below which the business is losing money.

What to do with the number

Here's where most articles stop. The number by itself is worthless. The use of the number is everything.

Use 1: a weekly scoreboard

Break-even becomes your finish line.

Every Monday morning you know: we need X this month to break even. Here's what we've invoiced so far. Here's the gap. That one sentence, week after week, shifts how the whole team thinks.

Sales teams work towards a number. Service teams watch for slippage. The owner stops second-guessing decisions because the decisions have a reference point.

Use 2: system prioritisation

Some systems fix variable costs. Some fix fixed costs. They move the break-even number differently, and knowing which is which tells you where to invest your time.

A system that shaves 2% off variable costs (better supplier terms, less waste in production, lower merchant fees) pushes your contribution margin up and lowers break-even.
A system that cuts a fixed cost (cancel the unused software, renegotiate rent, replace a contractor retainer with in-house) lowers break-even directly.
A system that increases sales volume without affecting costs (better marketing, faster quoting, higher close rate) does not change break-even, but every extra dollar above it flows straight to profit.

Which of the three is the most valuable for your business right now? Break-even tells you. If you're sitting well below break-even most months, cut fixed costs first. If you're sitting just above, push sales. If margins are thin, tighten variable costs.

Systemisation bliss: once break-even is stable, every system you build compounds above the floor — the curve goes up and to the right. — Systemisation bliss. Break-even sets the floor. Every system you build above it — tighter margin, leaner fixed costs, higher conversion — compounds into the gap. That gap is where the business actually lives.

Use 3: pricing and capacity decisions

"Should I take this job?" becomes a calculable question.

If the job covers its variable cost and contributes anything positive to fixed costs, and you have spare capacity, take it. If it dilutes margin and you're near capacity, refuse it. Pricing stops being a gut call and starts being a conversation about contribution.

Use 4: scale decisions

Every new hire adds to fixed costs. Every new software adds to fixed costs. Every new location adds to fixed costs.

Before you commit, you know exactly how much extra revenue you need to generate to re-break-even. If the hire costs $80,000 a year in fully loaded terms, and your contribution margin is 40%, you need an extra $200,000 in annual revenue to cover the hire ($80,000 ÷ 0.40). Now the decision is: can this hire plausibly drive $200k more revenue a year? If yes, go. If no, don't.

That one calculation has saved countless businesses from hires they couldn't afford.

Doug and Andrea Glanville and the family business that knew its numbers

Doug & Andrea Glanville on systemising a 30-year family retail business at Sydney String Centre. Read the full case study

Doug and Andrea Glanville run the Sydney String Centre — a family-owned business that has been selling, repairing, and renting string instruments for over 30 years. Around 40 staff. Retail floor. Workshop. E-commerce. Rental arm. Teaching partnerships.

Plenty of complexity, and a business mature enough that the costs have grown layer by layer across decades. The kind of business where nobody has questioned the subscription that started in 2014, or the distributor terms that were negotiated pre-GFC.

As Doug and Andrea moved to take more of a helicopter view, they started seeing the business as a system instead of a collection of departments. Andrea became the Systems Champion, and one of the early benefits was financial visibility. When every department's process was documented and connected to a cost centre, the fixed-cost creep and the margin-by-product-line picture became impossible to ignore.

What you get when a mature business finally systemises is not just better process. You get better numbers. Break-even becomes knowable across departments. The retail floor has a break-even. The workshop has a break-even. The rental program has a break-even. And when you know all three, you can make intelligent decisions about where to invest, where to prune, and where to double down.

This is how owners step up to being strategic leaders. Not by reading more books. By knowing their numbers well enough to make real calls.

See what your numbers are worth: Business Valuation Calculator

Break-even tells you the floor. This calculator shows how the gap above it translates into the market value of your business — systems-driven firms sell for 4-8x, owner-dependent ones for 1-2x.

A trap: treating break-even as a ceiling

Here's a failure mode.

Owners calculate break-even, set it as the target, and then celebrate when they hit it. Month after month. Just above the line.

That's not running a business. That's treading water.

Break-even is the floor, not the ceiling. It's the number below which you are losing money. Above it, your real metric is the gap — how many dollars above break-even you're generating, because that's the profit pool the business actually runs on.

A useful reframe: your target is not break-even. Your target is 25% to 40% above break-even, depending on the margin profile of your industry. That's the number that funds growth, pays the owner fairly, builds a buffer, and gives the business room to make a mistake without folding.

The break-even number sets the floor. The target above it sets the ambition.

The bottom line

Calculate it once. Check it quarterly. Use it every week.

Fixed costs, variable costs, contribution margin, break-even revenue. One hour of work. A different relationship to your business for the rest of your career.

The owners who know this number make different decisions than the ones who don't. About pricing. About hires. About which month is actually okay and which month is quietly a problem. About which system to fix next.

You don't need an MBA. You need a spreadsheet, three months of statements, and an hour.

Knowing your break-even is the financial discipline underneath everything else — including the ongoing improvement loop that makes every other part of the business compound.

Want the real picture? Start with the Business Valuation Calculator — it shows how the numbers tie back to the market value of your business (systems-driven businesses sell for 4-8x; owner-dependent ones for 1-2x). Then use a systemHUB free trial to document the systems that will actually move the number.

How to Calculate Your Business Break-Even Point (And Actually Use It)