Break-Even Calculator

How the break-even calculator works

The break-even point is the sales volume at which your revenue exactly equals your total costs — no profit, no loss. Below it, you’re losing money. Above it, every additional unit sold contributes pure profit (well, contribution margin — more on that below). The math is one of the foundational tools of business planning, used by everyone from coffee shop owners to SaaS founders to global manufacturing CFOs.

The core formula is straightforward:

• Break-even units = Fixed costs ÷ (Price per unit − Variable cost per unit)
• Break-even revenue = Break-even units × Price per unit

The denominator — price minus variable cost — is called the contribution margin per unit. It’s the amount each sale “contributes” toward covering fixed costs. Once enough units are sold for contribution margin to fully cover fixed costs, you break even. Beyond that, every unit’s contribution margin becomes profit.

For example: a coffee shop with $5,000/month in fixed costs (rent, salaries) selling coffee at $5/cup with $2.50/cup in variable cost (beans, milk, cups) has a contribution margin of $2.50 per cup. Break-even = $5,000 ÷ $2.50 = 2,000 cups per month. At 2,000 cups, revenue is $10,000, total costs are $5,000 (fixed) + $5,000 (variable: 2,000 × $2.50) = $10,000. Even. Sell one more cup, make $2.50 profit. Sell 500 more, make $1,250 profit.

This calculator shows the break-even point plus all the related metrics that make it useful for decisions — contribution margin, contribution margin percentage, margin of safety (if you enter current sales), and a sensitivity table showing profit at different volumes.

Fixed costs vs variable costs

The whole break-even calculation depends on correctly classifying your costs. Get this wrong and the break-even number is meaningless. The rule of thumb: would this cost change if you sold one more unit, or stay the same?

Fixed costs (don’t change with volume)

Costs you pay regardless of how much you sell. Typical examples:

• Rent — paid monthly whether you sell zero units or ten thousand
• Salaried staff — base salaries don’t change with sales (commissions and bonuses are variable; see below)
• Software subscriptions — most SaaS tools charge a flat monthly fee for your tier
• Insurance, licenses, permits — fixed annual or monthly amounts
• Loan payments — fixed monthly principal and interest
• Depreciation of equipment — accounting cost spread over time, not per unit

Variable costs (scale with each unit sold)

Costs that increase proportionally when you sell more. Typical examples:

• Raw materials — manufacturers, restaurants, anything that physically uses ingredients
• Shipping and packaging — every order costs you to fulfill
• Payment processing fees — Stripe, PayPal, etc. charge ~2.9% + $0.30 per transaction
• Sales commissions — paid per sale
• Hosting / cloud costs for SaaS — typically scale per user, per request, or per gigabyte
• Hourly contractor labor — paid only when working on units sold

Mixed costs (the tricky middle)

Some costs have a fixed component and a variable component. Utilities have a base fee (fixed) plus usage charges (variable). Payment processors charge a fee per transaction (variable) plus sometimes a monthly minimum (fixed). For break-even modeling, split mixed costs into their two components and treat each appropriately. For utility bills, this is often best modeled by putting the fixed monthly base in fixed costs and the per-unit usage in variable.

Contribution margin explained

Contribution margin is the most important number this calculator shows after the break-even point itself. It’s the amount each sale contributes to covering fixed costs (before break-even) or to profit (after break-even). Two views:

Contribution margin per unit

Price minus variable cost. For our coffee shop: $5 − $2.50 = $2.50 per cup. Every cup sold contributes $2.50 toward either fixed costs or profit, depending on whether you’ve reached break-even yet.

Contribution margin percentage

Contribution margin per unit ÷ price. For the coffee shop: $2.50 ÷ $5 = 50%. Half of every dollar of revenue contributes to fixed costs or profit; the other half is variable cost. Higher contribution margin % means your business model is more leveraged — sales above break-even produce more profit per dollar of revenue.

Why contribution margin matters more than break-even

Break-even tells you when you’ll stop losing money. Contribution margin tells you how much money you make per unit beyond break-even — which is more useful for decisions. A business with a 90% contribution margin (like most SaaS) needs few customers to be highly profitable. A business with a 10% contribution margin (like grocery retail) needs huge volume to make any meaningful profit. Both can be successful, but they require completely different strategies.

Compare two scenarios to see this clearly: a coffee shop at $5,000 fixed / 50% CM needs 2,000 cups to break even, then earns $2.50 per cup beyond. A SaaS app at $20,000 fixed / 95% CM needs ~213 customers to break even, then earns $94 per customer beyond. The SaaS reaches profitability at much lower volume because each sale contributes nearly the entire price.

Margin of safety

If you enter your current sales volume, the calculator computes your margin of safety — how far above break-even you are. This is a critical metric for understanding business stability.

• Margin of safety (units) = Current sales − Break-even sales
• Margin of safety (%) = (Current sales − Break-even sales) ÷ Current sales × 100

A positive margin of safety means you’re profitable; the percentage shows how much sales could drop before you’d hit break-even. A 50% margin of safety means sales could fall by half and you’d still be at break-even — a stable, well-positioned business. A 5% margin of safety means a small dip in sales puts you in the red — a fragile business that needs revenue growth or cost reduction.

Typical margin of safety benchmarks

• 50%+ — Healthy, resilient business. Can absorb significant sales decline.
• 25–50% — Comfortable. Most established small businesses fit here.
• 10–25% — Workable but vulnerable. Plan for the next downturn now.
• 0–10% — Dangerously thin. Any disruption will cause a loss.
• Negative — You’re already below break-even. Operating at a loss.

What to do if you’re below break-even

The calculator will show negative margin of safety and a current loss if your sales are below break-even. This is common for new businesses, businesses in declining markets, or businesses with cost structures that have crept up over time. There are three ways out, in increasing order of difficulty:

1. Increase sales volume (toward break-even)

Easiest in concept, hardest in execution. Better marketing, more sales effort, higher conversion rates, or geographic expansion — anything that lifts unit volume. The break-even calculator tells you exactly how many more units you need. For our coffee shop selling 1,500 cups against a 2,000-cup break-even, that’s 500 more cups per month — roughly 17 more per day. Concrete and actionable.

2. Cut variable costs (raise contribution margin)

Renegotiate supplier contracts, reduce material waste, switch to cheaper inputs without hurting price. Every dollar removed from variable cost goes directly into contribution margin. For the coffee shop, getting variable cost from $2.50 to $2.00 means contribution margin goes from $2.50 to $3.00 per cup — break-even drops from 2,000 to 1,667 cups. A 17% reduction in volume needed.

3. Cut fixed costs (lower the break-even bar)

Move to a cheaper location, reduce headcount, drop unused software subscriptions, renegotiate rent. Every dollar removed from fixed costs reduces the break-even point by 1/CM units. For the coffee shop, cutting $500 of fixed costs reduces break-even by $500 ÷ $2.50 = 200 cups. Smaller effect than cutting variable cost in this scenario, but often easier to execute quickly.

In practice, most struggling businesses need to do all three. The break-even calculator lets you model each individually to see which lever has the biggest impact for your specific cost structure.

Assumptions and limitations

• Linear costs. The model assumes variable cost per unit stays constant — every unit costs the same in materials and shipping. In reality, bulk discounts, capacity constraints, and overtime can change unit costs at different volume levels.
• One price point. Every unit is sold at the same price. Real businesses often have multiple price tiers, discounts, promotions, and customer-specific pricing — calculate weighted average price across your typical mix.
• Single product. The calculator handles one product or product category. For multi-product businesses, calculate break-even for each product separately, or use a weighted average contribution margin across your product mix.
• No taxes. Break-even is shown before income taxes. After-tax break-even is higher because taxes apply to profit beyond break-even.
• One time period. Fixed costs and break-even results are typically calculated for a single month or year. Make sure all inputs (fixed costs, current sales) refer to the same time period.
• No cash flow timing. Break-even tells you when you cover costs, not when cash arrives. A business that breaks even on the books can still run out of cash if customers pay slowly — model cash flow separately.

Break-even calculator FAQ

What’s the difference between break-even point and profit margin?

Break-even point is the volume at which you stop losing money — it answers “how much do I need to sell?”. Profit margin is the percentage of revenue that becomes profit at a given volume — it answers “how profitable is each sale?”. Both matter. A high contribution margin lets you reach break-even at low volume, but your profit margin only becomes positive after fixed costs are covered. See our Markup Calculator to work out margins from cost and price.

How often should I recalculate break-even?

Whenever costs change materially. Rent renewal, new hire, software subscription, supplier price change, retail price adjustment — any of these shifts your break-even point. At minimum, recompute quarterly. Founders should know their current break-even point from memory at any given time.

Does break-even include taxes?

No — it’s calculated on pre-tax revenue and costs. After-tax break-even is harder to define cleanly because taxes apply to profit (revenue minus all costs), and profit is zero at break-even. If you need to cover after-tax obligations (loan payments, owner draws), add those to fixed costs to find the volume needed.

How does break-even work for service businesses?

Same formula, but the “unit” is something like a billable hour, a project, or a client. For a consulting business: fixed costs = office, software, base salaries; variable cost per project = subcontractor fees, materials; price per project = your average project fee. Break-even tells you how many projects per month you need to cover overhead.

What about SaaS or subscription businesses?

The “unit” is a subscriber. Fixed costs are office, salaries, infrastructure base; variable cost is per-subscriber hosting, support, payment processing. Subscription businesses typically have very high contribution margins (often 80–95%), so break-even comes at relatively low subscriber counts — but they have high upfront fixed costs (engineering teams, marketing). Use monthly recurring revenue (MRR) framing throughout.

Should I use my list price or my actual selling price?

Actual realized price — the amount you actually receive per unit on average. List price minus discounts, refunds, returns. If you offer 20% off most of the time, your effective price is your list price × 0.80. Using list price overstates contribution margin and gives a falsely low break-even number.