Break-even analysis answers a simple but critical question: at what level of sales does your business stop losing money? Understanding your break-even point is essential for pricing, planning, and assessing whether a business idea is viable before you commit significant capital to it.
The Break-Even Formula
The break-even point is the level of revenue (or number of units) at which total revenue equals total costs. There is no profit or loss at this point. Every sale above break-even contributes to profit.
Break-Even in Units: Fixed Costs divided by (Selling Price minus Variable Cost per Unit)
Break-Even in Revenue: Fixed Costs divided by Contribution Margin Ratio
Where: Contribution Margin Ratio = (Selling Price minus Variable Cost) divided by Selling Price
Fixed Costs vs Variable Costs
The distinction between fixed and variable costs is the foundation of break-even analysis.
Fixed costs do not change with the volume of sales. Whether you sell 10 units or 1,000 units this month, fixed costs stay the same:
- Rent and utilities
- Salaries (for permanent staff)
- Software subscriptions and licences
- Insurance
- Loan repayments
- Depreciation
Variable costs scale directly with sales volume. The more you sell, the more these cost:
- Raw materials and components
- Packaging
- Payment processing fees (percentage-based)
- Commission paid to sales staff
- Shipping and fulfilment
- Freelancer costs tied to specific projects
Semi-variable costs have both a fixed element and a variable element: a phone bill with a monthly base charge plus a per-call rate, or a member of staff on salary who earns a bonus for hitting targets. For break-even purposes, split semi-variable costs into their fixed and variable components.
Worked Example: Product Business
A candle maker sells handmade candles at £18 each. The variable cost per candle (wax, wick, jar, fragrance, label, packaging) is £6. Monthly fixed costs are:
- Studio rent: £400
- Utilities: £80
- Insurance: £50
- Marketing: £150
- Software and admin: £70
Total monthly fixed costs: £750
Contribution per candle = £18 minus £6 = £12
Break-even in units: £750 / £12 = 62.5 candles per month
Round up to 63 candles. Until she sells 63 candles, she makes a loss. Each candle above 63 contributes £12 to profit.
Break-even in revenue: 63 x £18 = £1,134 per month
Use our Break-Even Calculator to model your own numbers.
Worked Example: Service Business (Freelancer / Agency)
For service businesses, the concept applies differently. There are no variable costs per unit of service in the traditional sense, but you can model it as: your time costs money (even if you pay yourself), and there are hours in a month.
An independent consultant has:
- Monthly overhead (subscriptions, insurance, equipment, accounting): £500
- Target monthly income (salary equivalent): £4,000
- Total monthly cost base: £4,500
- Day rate: £450
- Working days available per month: 18
Break-even: £4,500 / £450 = 10 days per month
The consultant breaks even at 10 days of billing per month. The remaining 8 days (of the 18 available) represent profit capacity. If she bills only 9 days, she effectively earns less than her cost base.
This model helps answer: "How many client days do I need before I can afford to hire someone or reduce my hours?"
Contribution Margin: The Key Metric
The contribution margin (selling price minus variable cost) is how much each unit of sale contributes to covering fixed costs. Once fixed costs are covered, the contribution margin becomes profit.
For the candle business above:
- Contribution margin per candle: £12
- Contribution margin ratio: £12 / £18 = 66.7%
This means 66.7 pence of every pound of revenue is available to cover fixed costs and generate profit.
A higher contribution margin ratio means:
- Lower break-even point
- More profit per additional sale above break-even
- More resilience to slow months
Using Break-Even for Pricing Decisions
Break-even analysis should inform your pricing, not just validate it. Some practical applications:
Testing a Price Increase
If you raise your price from £18 to £22 (keeping variable costs at £6):
- New contribution margin: £16
- New break-even: £750 / £16 = 47 units (vs 63 units previously)
You could sell 25% fewer units and still break even. If raising the price does not reduce volume by more than 25%, it is worth doing.
Assessing a New Product or Service
Before launching, model the break-even point with realistic fixed cost additions (additional equipment, a new hire, extra marketing spend). If the break-even requires a volume that seems unlikely given your market, the numbers are telling you to reconsider.
Evaluating a Discount
If you offer a 15% discount (from £18 to £15.30):
- New contribution margin: £15.30 minus £6 = £9.30
- New break-even: £750 / £9.30 = 81 units
You now need to sell 81 units instead of 63 to break even. The discount only makes sense if the increased volume is expected to more than compensate.
Limitations of Break-Even Analysis
Break-even analysis is a useful planning tool, but it has important limitations:
It assumes costs are linear. In reality, variable costs often change at scale (bulk discounts, volume-based fees) and fixed costs can jump in steps (hire a new employee, move to a larger premises).
It does not account for time. A business might break even over the full year but run out of cash in a particular month. Pair break-even analysis with cash flow forecasting using our Cash Flow Forecast tool.
It uses a single average selling price. If you sell multiple products or services at different prices, you need a weighted average or separate analysis per product line.
Break-Even and Business Loans
If you are considering borrowing to fund start-up costs or expansion, the loan repayment becomes an additional fixed cost. Model the break-even with and without the loan repayments to understand the real impact. Our Business Loan Calculator can help you model the monthly repayment, which you can then feed into your break-even calculation.
Key Takeaways
- Break-even = Fixed Costs divided by Contribution Margin per Unit
- Know your fixed vs variable costs before you price anything
- A higher contribution margin means a lower break-even and faster path to profit
- Use break-even to test price changes before implementing them
- Pair with cash flow forecasting for a complete picture
Calculations are for planning purposes. Actual results depend on your specific cost structure and market conditions. Consult a qualified accountant before making significant business decisions.