Break-Even Calculator — Ireland

What This Calculator Does

The break-even point is the sales volume at which your total revenue exactly equals your total costs — you are making neither a profit nor a loss. Every unit sold above that point generates profit; every unit below it deepens your loss. Knowing your break-even is one of the most practical pieces of financial information an SME owner can have.

This calculator gives you your break-even in two ways: the number of units (or billable days, or client engagements) you need to sell each month, and the equivalent revenue figure. It also calculates your contribution margin — the amount each sale contributes to covering your fixed costs — and your margin of safety, which shows how much your sales can fall before you slide into a loss.

Use it for: pricing decisions, business plans, lender projections, new product viability testing, and stress-testing your business model before committing to a new lease or hire.

How Break-Even Analysis Works

The calculation rests on a simple insight: your fixed costs must be covered by the collective contribution of every unit you sell. Once those costs are covered, additional sales are profitable.

Step 1 — Contribution Margin per Unit

If you sell a product for €3.50 and it costs €0.80 in materials and packaging, your contribution margin is €2.70. Each sale contributes €2.70 towards your fixed costs and eventually profit.

Step 2 — Break-Even Units

If your monthly fixed costs are €8,500 and your contribution margin is €2.70, you need to sell 3,149 units per month to break even (always round up — you need to cover all costs).

Step 3 — Break-Even Revenue

The contribution margin ratio (CMR) expresses contribution margin as a percentage of selling price. A CMR of 77% means 77 cents of every euro in revenue goes to covering fixed costs and generating profit after variable costs are paid.

Step 4 — Margin of Safety

If you currently sell 4,000 units and your break-even is 3,149, your margin of safety is 851 units or 21.3%. Sales would have to fall more than 21% before you make a loss.

Worked Examples — Irish Businesses

How to Interpret Your Results

Contribution Margin Ratio by Sector (Irish Benchmarks)

• Professional services (legal, accounting, consulting): 70–90% CMR — low variable costs per hour.
• SaaS / tech: 75–90% CMR — marginal cost of an extra user is near zero once built.
• Hospitality (food & beverage): 60–75% CMR on drinks; 50–65% on food.
• Retail (fashion, gifts): 45–65% CMR — cost of goods is a significant variable cost.
• Construction / trades: 20–35% CMR — materials and direct labour are very high variable costs.

Margin of Safety — Reading the Signals

A margin of safety below 10–15% is a serious risk indicator — one bad month could put you in the red. Between 15–30% is workable but warrants close attention. Above 30% gives you a reasonable cushion for seasonal swings, unexpected costs or market downturns. During planning, aim for a margin of safety of at least 20% in your conservative scenario.

Common Mistakes with Break-Even Analysis

• Treating semi-variable costs as fully fixed. Electricity, overtime wages and delivery costs often have both a fixed and variable element. Misclassifying them inflates your contribution margin and gives an unrealistically low break-even.
• Using average selling price when your product mix varies. If you sell products at €5, €15 and €50 and the mix shifts toward lower-priced items, your effective break-even rises even if total revenue holds steady.
• Ignoring your own salary in fixed costs. Many sole traders omit their own drawings. If the business breaks even but can't pay you, it's working for free.
• Using VAT-inclusive prices. Always use ex-VAT figures. VAT-inclusive prices overstate your margin and understate your true break-even.
• Treating break-even as a target. Break-even is a floor, not a goal. It leaves no margin for taxes, loan repayments, or unexpected costs.
• Not updating when costs change. Rent reviews, pay increases, new insurance premiums — recalculate your break-even whenever a significant cost changes.