Question 1

What is the break-even point and why does it matter?

Accepted Answer

The break-even point is the number of units sold (or revenue generated) at which total revenues exactly equal total costs — meaning no profit and no loss. Every sale beyond the break-even point contributes pure profit (assuming variable costs stay constant). Why it matters: it tells you the minimum sales volume you must achieve before your business starts making money; it helps you set pricing — if the break-even point is too high, you may need to raise prices or cut costs; it quantifies your risk — a business with a low break-even point survives slow months more easily; and it is a key metric for investors and lenders assessing viability.

Question 2

How do you calculate the break-even point?

Accepted Answer

Break-even in units = Fixed Costs / (Selling Price per Unit − Variable Cost per Unit). The denominator (Selling Price − Variable Cost) is called the Contribution Margin per Unit. Break-even in revenue = Fixed Costs / Contribution Margin Ratio, where CM Ratio = Contribution Margin per Unit / Selling Price. Example: Fixed costs £5,000/month; Selling price £50/unit; Variable cost £20/unit. Contribution Margin = £50 − £20 = £30. Break-even units = £5,000 / £30 = 167 units/month. Break-even revenue = 167 × £50 = £8,350. Any unit sold after the 167th contributes £30 straight to profit.

Question 3

What are fixed costs vs variable costs?

Accepted Answer

Fixed costs do not change with production volume (within a relevant range): rent, salaries, insurance, loan repayments, software subscriptions, equipment depreciation. Variable costs change directly with each unit produced or sold: raw materials, packaging, shipping, payment processing fees, freelancer pay-per-project, sales commissions. Semi-variable (mixed) costs have both components: a base cost plus a variable component (e.g. electricity has a standing charge plus a per-unit cost). For break-even analysis, split semi-variable costs into their fixed and variable components. As a business scales, some fixed costs become variable — a business that rents extra warehouse space when sales exceed a threshold has a stepped fixed cost.

Question 4

What is the margin of safety?

Accepted Answer

The margin of safety measures how far current sales can fall before you reach the break-even point. Margin of Safety = (Current Sales − Break-even Sales) / Current Sales × 100. Example: Current monthly sales = 300 units; Break-even = 167 units. Margin of Safety = (300 − 167) / 300 × 100 = 44.3%. This means sales could fall 44% before the business makes a loss. A high margin of safety (above 25–30%) indicates a resilient business. A low margin of safety (below 10–15%) means the business is operating close to its break-even — small downturns in revenue can cause losses.

Break-even Calculator

Break-even analysis components

Fixed costs

Variable costs per unit

Selling price per unit

Break-even units

Break-even revenue

Margin of safety

Frequently asked questions

Related tools

Know exactly when your business starts making money