Break-Even Calculator
Find exactly when revenue will cover all your costs
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What is Break-Even Analysis and Why It Matters
Break-even analysis answers the most fundamental business question: how much do I need to sell before I start making money? Every business — from a solo freelancer to a manufacturing company — has fixed costs that must be covered before any profit is possible. Understanding your break-even point is the foundation of sound pricing, budgeting, and growth planning.
Entrepreneurs use it to validate business ideas, investors use it to evaluate risk, and managers use it to set sales targets. Knowing your break-even point also reveals your margin of safety — how much sales can drop before you fall into a loss.
Break-Even Formulas
Contribution Margin per Unit = Selling Price − Variable Cost
Break-Even Units = Fixed Costs / Contribution Margin per Unit
Break-Even Revenue = Fixed Costs / Contribution Margin Ratio
Margin of Safety = (Actual Sales − Break-Even Sales) / Actual Sales × 100
Practical Example
Fixed costs: $10,000/month. Product price: $50. Variable cost: $20. Contribution margin: $30/unit. Break-even = $10,000 / $30 = 334 units/month. At 500 units, profit = (500 × $30) − $10,000 = $5,000.
When to Use This Calculator
Use the break-even calculator whenever you need to answer a core business viability question — before launching a product, evaluating a price change, hiring a new employee, or signing a long-term lease. Here are the most common real-world scenarios:
- New product launch: A food entrepreneur making artisan hot sauce wants to know if selling at $12/bottle can cover $3,500/month in kitchen rental and ingredient costs. With variable costs of $4/bottle and fixed costs of $3,500, break-even = 438 bottles/month — about 15/day.
- Price increase decision: A software agency charges $500/project with $200 in contractor fees and $8,000/month overhead. Break-even = 27 projects. Raising the price to $600 drops break-even to 20 — a meaningful reduction in required sales volume.
- Adding overhead: A freelancer considering renting office space for $900/month needs to calculate whether they can win enough additional clients to cover the new fixed cost before signing.
- Startup runway planning: Calculate at what monthly revenue your burn rate becomes sustainable — helping you set a clear "default alive" milestone for investors.
Step-by-Step Example: Online Store
A clothing reseller sells t-shirts for $35 each. Each shirt costs $12 (wholesale + shipping). Fixed monthly costs: platform fees $50, ads $400, storage $150 = $600/month.
Step 1 — Contribution margin: $35 − $12 = $23/unit
Step 2 — Break-even units: $600 ÷ $23 = 27 units/month (rounded up)
Step 3 — Break-even revenue: 27 × $35 = $945/month
Step 4 — Margin of safety at 50 sales: (50 − 27) / 50 = 46%
This means the store can absorb a 46% sales drop before losing money. At 50 units, monthly profit = (50 × $23) − $600 = $550.
Break-Even Calculator for Small Business — Real Examples
Small businesses operate on tight margins. Knowing your break-even point is not optional — it's the difference between a business that survives its first year and one that doesn't. Here are three detailed real-world scenarios using this calculator.
Example 1: Coffee Shop
A coffee shop has these monthly fixed costs: rent £2,200, staff £3,800, equipment lease £300, insurance £150, utilities £250 = £6,700/month. Average drink sold for £3.80, with £0.90 in variable costs (coffee, milk, cup). Contribution margin = £3.80 − £0.90 = £2.90 per drink.
Break-even = £6,700 / £2.90 = 2,311 drinks/month (77 drinks/day, assuming 30 days open). At 100 drinks/day: monthly profit = (100×30×£2.90) − £6,700 = £2,000/month. Margin of safety = (3,000 − 2,311) / 3,000 = 23%.
Example 2: Freelance Web Developer
A freelancer's fixed costs: home office £200, software subscriptions £120, accountant £100, marketing £80 = £500/month. Day rate: £400. Variable costs per project: 0 (time is the input, not a direct material cost). Contribution margin = £400/day.
Break-even = £500 / £400 = 1.25 days/month — just over one billable day covers all overheads. Any additional days are profit. At 15 billable days/month: profit = (15 × £400) − £500 = £5,500/month. This is why freelancers have such high leverage once past break-even.
Example 3: Online Clothing Store
An e-commerce store selling handmade clothing. Fixed costs: Shopify £29, ads £600, packaging materials (fixed order) £200, storage £100 = £929/month. Average selling price: £55. Variable costs per unit: wholesale £18 + shipping £4 = £22. Contribution margin = £55 − £22 = £33/unit.
Break-even = £929 / £33 = 29 units/month. At 60 units/month: profit = (60 × £33) − £929 = £1,051/month. Doubling ad spend to £1,200 raises break-even to 42 units — only worth it if ads generate at least 13 extra sales per month.
How to Use This for Your Small Business
List every fixed cost you pay regardless of sales (rent, staff, subscriptions, insurance). Then identify the variable cost of delivering each unit or service. Enter these into the calculator above to instantly see your break-even point — and experiment with price changes to see how they affect the number of sales you need to reach profitability.