Break-Even Point: The Exact Formula Small Businesses Need
- 333 candles. That's the number that decides if your business survives the month.
- What is the break-even formula — and which version should you use?
- How do you separate fixed costs from variable costs accurately?
- What does your break-even point actually tell you about pricing?
- How AskBiz calculates your break-even point from your live data
- Warning signs your break-even point is moving against you right now
- Your action plan for this week
Your break-even point is fixed costs divided by your contribution margin per unit — and most small business owners get it wrong because they misclassify costs. Getting this number right tells you exactly how many sales you need before you stop bleeding cash. Run it monthly, not once at launch.
- 333 candles. That's the number that decides if your business survives the month.
- What is the break-even formula — and which version should you use?
- How do you separate fixed costs from variable costs accurately?
- What does your break-even point actually tell you about pricing?
- How AskBiz calculates your break-even point from your live data
333 candles. That's the number that decides if your business survives the month.#
Here's the maths behind that figure. A candle business with £5,000 in monthly fixed costs — rent, utilities, base salaries — sells each candle for £25. Each one costs £10 to make: materials, packaging, labour. That leaves £15 profit per unit. Divide £5,000 by £15 and you get 333 units. Sell fewer than that, you're losing money. Sell more, you're profitable. That's your break-even point, per Investopedia's core definition. Simple enough. But most small business owners either don't calculate it at all, or run the number once at launch and never revisit it. That's the mistake. Costs shift. Your wholesale supplier raises prices by 8%. Your landlord bumps rent at renewal. You hire a part-time member of staff. Each of those moves your break-even point upward — silently, unless you're tracking it. The U.S. Small Business Administration puts it plainly: the break-even point is where revenues from sales equal all business expenses. Not gross profit covering some costs. All of them. That distinction matters because £5,000 in product sales sounds healthy until you subtract £3,000 in cost of goods and realise you've only generated £2,000 in gross profit — nowhere near enough to cover your overheads. This post gives you the exact formula, walks you through it with real numbers, and tells you how to use it as a live operating tool — not a one-time spreadsheet exercise.
What is the break-even formula — and which version should you use?#
Two versions exist. Use the right one for your business type. **Break-even in units:** Fixed costs ÷ (Selling price per unit − Variable cost per unit) **Break-even in sales revenue:** Fixed costs ÷ Contribution margin ratio The contribution margin ratio is your contribution margin per unit divided by your selling price. If you sell a product for £50 and it costs £20 to produce, your contribution margin is £30 and your ratio is 60%. The unit formula works best if you sell one product or a small range of similar-priced items — a bakery charging £3.50 per loaf, a repair shop charging £85 per job. The revenue formula suits businesses with varied product mixes, like a clothing retailer or a restaurant with 40 items on the menu. Let's run the unit formula properly. Take a SaaS startup — modelled on a business.com example — with £72,800 in monthly fixed costs: salaries, server infrastructure, office space. Each customer costs £31 per month to service (support, hosting, onboarding). Monthly subscription price: £149. Contribution margin: £118 per customer. Break-even: 617 customers. That number is actionable. The founder knows their sales team needs to hold 617 active subscriptions before the business stops losing money. If churn is running at 4% monthly, they need to acquire at least 25 new customers every month just to stay flat — before they even think about growth. Quick answer: To calculate your break-even point, divide your total monthly fixed costs by your contribution margin per unit (selling price minus variable cost per unit). For a business with £5,000 fixed costs and a £15 contribution margin, the break-even is 333 units sold per month.
How do you separate fixed costs from variable costs accurately?#
This is where most calculations fall apart. People misclassify costs — and then wonder why they're past break-even on paper but still running out of cash. Fixed costs don't move with your sales volume. Rent is fixed. Your accountant's monthly retainer is fixed. The insurance premium is fixed. A full-time employee's salary is fixed, even if they're doing nothing in a slow week. Variable costs scale directly with production or sales. Raw materials are variable. Packaging is variable. Payment processing fees — typically 1.4% to 2.9% per transaction on Stripe — are variable. Delivery costs are variable. The grey area is semi-variable costs. A part-time member of staff whose hours flex with demand. Electricity in a factory that spikes during production runs. Marketing spend you increase when sales are strong. For break-even purposes, treat semi-variable costs conservatively. Split them: estimate the fixed floor (the minimum you'll spend regardless) and classify that as fixed. The rest is variable. Here's a real-world trap: a Lagos-based fashion retailer doing ₦4.2M in monthly revenue included their Instagram ad spend in fixed costs. It wasn't fixed — it scaled with the season. When they corrected the classification, their true fixed costs dropped by 18% and their break-even point shifted from 890 units to 730 units. They'd been underpricing their slow-season collections for eight months. Get this classification right once, document it, and review it quarterly. Costs shift faster than most founders track.
What does your break-even point actually tell you about pricing?#
Most founders run break-even analysis to check survival. The smarter use is pricing strategy. Your contribution margin is the lever. A higher selling price or lower variable cost per unit moves your break-even down — meaning you need fewer sales to cover your fixed base. A price increase of £5 per unit on a product with £3,000 in fixed costs doesn't just improve margin on units above break-even. It reduces the number of units you need to sell before you start making money at all. Run this test: what happens to your break-even if you raise prices by 10%? If your current selling price is £40, variable cost is £15, and fixed costs are £6,000 — your current break-even is 240 units. Raise the price to £44 and the break-even drops to 207 units. You need 33 fewer sales per month to stay solvent. The counter-question is always: will a 10% price rise reduce volume enough to offset the margin improvement? That's a demand elasticity question, not a maths question. But at least you're asking it with the right numbers in front of you. The SBA framework for break-even also works in reverse: if you know your maximum realistic sales volume — say, a food truck that can serve 120 covers per day — you can calculate the minimum price needed to break even at that volume. Fixed costs £2,400/month, variable cost per cover £6, capacity 2,640 covers/month: your minimum price per cover is roughly £6.91 just to break even. Price below that and you're guaranteed to lose money regardless of how many customers show up.
How AskBiz calculates your break-even point from your live data#
A Nairobi-based gift shop owner connected her Xero account to AskBiz and typed: 'What's my break-even point this month based on my actual costs?' AskBiz pulled her fixed costs directly from categorised Xero transactions — rent, staff wages, insurance, software subscriptions — totalling KSh 187,400. It identified variable costs from her cost-of-goods data: an average of 38% of selling price per item. With an average selling price of KSh 850, her contribution margin came out at KSh 527 per unit. Break-even: 356 units per month. AskBiz then cross-referenced her sales data from the previous 90 days. She was averaging 291 units per month. She was below break-even — and hadn't known it, because her bank balance had stayed positive thanks to a large one-off corporate order in March that masked the underlying gap. The platform flagged it as a proactive alert: 'You are currently selling 65 units below break-even. At current average selling price and cost structure, you need to increase monthly revenue by KSh 55,255 to reach profitability.' That's the difference between running break-even as a one-time exercise and having it recalculated every month against your actual numbers. No spreadsheet. No accountant. The answer updates as your costs do. AskBiz's CFO Dashboard includes break-even tracking as a live metric alongside cash flow forecasting and margin analysis. Try it free — the Growth plan is £19/month with a 3-month free trial, and the first 10 questions are free with no card required.
Warning signs your break-even point is moving against you right now#
Four signals to check this week: **Your gross margin is shrinking but prices haven't changed.** Variable costs are rising — raw materials, shipping, processing fees — and your contribution margin is quietly compressing. Every 1% increase in variable costs moves your break-even upward. **You've hired in the last 90 days.** A new full-time employee typically adds £1,800–£3,200/month in fixed costs in the UK once you include employer NI and pension contributions. Your break-even point moved the day they started — most founders don't recalculate until the quarter-end. **Your sales mix has shifted toward lower-margin products.** If you're selling more of the items that cost more to produce relative to their price, your blended contribution margin drops — even if total revenue stays flat. **You had a strong month last month.** One good month can mask a structurally broken break-even. Check whether last month's revenue was repeatable or driven by a one-off order, seasonal spike, or discount campaign.
Your action plan for this week#
Before Friday: pull your last three months of fixed costs from your accounting software and total them. Divide by three to get your monthly fixed cost baseline. Then calculate your average contribution margin per unit or per transaction. Run the formula. Write the number down. That's your current break-even. Set up once: create a simple monthly tracker — a Google Sheet works — where you log fixed costs, average selling price, and average variable cost each month. Set a calendar reminder for the 5th of every month to update it. Break-even isn't a launch calculation. It's a monthly health check. Track monthly: the gap between your actual unit sales and your break-even unit number. If that gap is closing — if you're selling fewer units relative to break-even than you were three months ago — you have a problem developing in slow motion. Catching it at a 30-unit gap is a pricing or cost conversation. Catching it at a 200-unit gap is a survival conversation.
People also ask
How do you calculate the break-even point for a small business?
Divide your total monthly fixed costs by your contribution margin per unit — that's your selling price minus your variable cost per unit. A business with £5,000 in fixed costs and a £15 contribution margin breaks even at 333 units. Smart operators recalculate this every month as costs shift.
What is contribution margin and why does it matter for break-even?
Contribution margin is what's left from a sale after you subtract the variable cost to make or deliver it. If you sell a product for £25 and it costs £10 to produce, your contribution margin is £15. Every unit sold above break-even contributes that £15 directly toward profit.
What is the difference between fixed costs and variable costs in break-even analysis?
Fixed costs stay constant regardless of sales volume — rent, salaries, insurance. Variable costs scale with production or sales — materials, packaging, transaction fees. Misclassifying semi-variable costs like part-time staff is the most common reason break-even calculations give founders the wrong number.
How do you calculate break-even point in sales revenue not units?
Divide your total fixed costs by your contribution margin ratio — that's contribution margin per unit divided by selling price. A business with £6,000 fixed costs, a £30 contribution margin, and a £50 selling price has a 60% margin ratio and breaks even at £10,000 in monthly revenue.
How does AskBiz help calculate break-even point for small businesses?
AskBiz pulls live cost and revenue data from connected tools like Xero, QuickBooks, and Shopify, then calculates your break-even point automatically via its CFO Dashboard. It flags when you're below break-even and quantifies exactly how much additional revenue you need — updated monthly without manual input.
Alice Watson is AskBiz's Head of Market Intelligence. She tracks regulatory shifts, pricing trends, and growth signals across global SME markets — and turns them into briefings founders can act on before their competitors notice.
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