Calculate how many units you need to sell to cover your fixed costs and start making a profit.
This calculator provides estimates based on simplified assumptions. Actual results may vary depending on market conditions, pricing changes, and variable cost fluctuations.
Break-even analysis is one of the most fundamental tools in business planning. It answers a simple but critical question: how many units do you need to sell before your revenue covers all your costs? Until you reach this point, you are operating at a loss. Beyond it, every additional sale generates profit. For UK small business owners, freelancers, and entrepreneurs, understanding your break-even point is essential when launching a new product, setting prices, or evaluating whether a business idea is viable. It forces you to think clearly about your cost structure, separating fixed costs (rent, insurance, salaries, software subscriptions) from variable costs (materials, shipping, payment processing fees). This calculator goes beyond the basic break-even units figure. It also computes your contribution margin (how much each sale contributes toward covering fixed costs), the contribution margin percentage, the break-even revenue target, and the margin of safety if you enter your current sales volume. The margin of safety tells you how far sales could drop before you start losing money, which is a vital metric for business resilience. The interactive chart plots revenue and total cost lines, making it easy to visualise where they intersect (the break-even point) and how quickly profit accumulates beyond it. This is the classic break-even chart taught in business courses, but calculated instantly with your specific numbers. Whether you are writing a business plan for a bank loan, pitching to investors, evaluating a new product line, or simply checking whether your side hustle covers its costs, this calculator provides the clarity you need.
To use the break-even calculator: 1. Enter your Fixed Costs. These are costs that remain the same regardless of how many units you sell. Examples include monthly rent, insurance premiums, staff salaries, website hosting, and loan repayments. Use the same time period (monthly or annual) consistently. 2. Enter the Selling Price per Unit. This is the price customers pay for one unit of your product or service. 3. Enter the Variable Cost per Unit. This is the cost directly associated with producing or delivering one unit. It includes materials, packaging, shipping, and any per-unit fees such as payment processing charges. 4. Optionally enter Current Sales. If you already have an established sales volume, enter it here to calculate your margin of safety. 5. Review the results. Break-Even Units shows how many you must sell. Break-Even Revenue shows the total revenue target. Contribution Margin shows the per-unit profit available to cover fixed costs. Margin of Safety shows how much cushion you have above break-even.
The break-even calculation uses these formulas: 1. Contribution Margin per Unit = Selling Price - Variable Cost per Unit Example: GBP 25 selling price - GBP 10 variable cost = GBP 15 contribution margin 2. Break-Even Units = Fixed Costs / Contribution Margin per Unit Example: GBP 5,000 / GBP 15 = 333.33, rounded up to 334 units (Always rounded up because you cannot sell a fraction of a unit) 3. Break-Even Revenue = Break-Even Units x Selling Price Example: 334 x GBP 25 = GBP 8,350 4. Contribution Margin % = (Contribution Margin / Selling Price) x 100 Example: (GBP 15 / GBP 25) x 100 = 60% 5. Margin of Safety = ((Current Sales - Break-Even Units) / Current Sales) x 100 Example: ((500 - 334) / 500) x 100 = 33.2% The contribution margin percentage is particularly useful for comparing products or businesses. A higher percentage means each pound of revenue contributes more toward profit. Service businesses typically have higher contribution margins than product businesses because variable costs (mainly time) are lower relative to revenue. If the variable cost per unit equals or exceeds the selling price, the contribution margin is zero or negative, and break-even is impossible. You would need to raise prices, reduce variable costs, or rethink the business model entirely.
UK business owners should factor in VAT when doing break-even analysis. If you are VAT-registered, your selling price to customers includes 20% VAT that you must remit to HMRC. Your actual revenue per unit is the VAT-exclusive price. Similarly, variable costs should be entered net of any reclaimable VAT. Our VAT Reverse Calculator can help extract the net amount from VAT-inclusive prices. For pricing strategy, the Markup vs Margin Calculator helps you set prices that achieve your target profitability. If you are preparing financial projections for a business plan, remember that break-even analysis assumes a linear relationship between volume and costs, which may not hold at very high volumes where economies of scale or capacity constraints change the equation.