The Business Break-Even Calculator determines the exact revenue level or unit volume at which your business covers all costs — fixed and variable — with zero profit and zero loss. Enter your fixed costs, variable cost per unit, and selling price per unit to instantly see your break-even point in both units and dollars, your contribution margin, and how much revenue cushion you have above break-even.

Break-even analysis is a foundational tool for any business decision involving cost structure. The U.S. Small Business Administration includes break-even analysis as a required component of business plans submitted for SBA loan applications. Understanding your break-even gives you a floor: every dollar of revenue above break-even contributes directly to profit.

Who needs break-even analysis?

• Startups: Determine how long the runway must be and what monthly sales target must be hit before the business becomes self-sustaining.
• Established businesses: Evaluate the impact of a new product line, a price change, or a fixed-cost increase (new employee, new facility) on break-even volume.
• Retailers and e-commerce: Calculate how many units must be sold at a given margin to cover monthly overhead including platform fees and advertising.
• Restaurants: National Restaurant Association data shows the typical restaurant breaks even at 70–75% of seating capacity — knowing your specific break-even point drives staffing and hours decisions.
• Service businesses: Freelancers and agencies use break-even to set minimum billable hours or monthly retainer thresholds.

In Canada, break-even analysis incorporates the same cost structure but must account for GST/HST-exclusive revenue (since collected taxes flow through to the government), WSIB/WCB premiums as quasi-fixed overhead costs, and provincial minimum wage differences that affect variable labor costs. The CRA's business income guide provides the accounting framework Canadian businesses use to classify fixed vs. variable costs.

The break-even framework rests on a single concept: Contribution Margin — the amount each unit of revenue contributes to covering fixed costs after variable costs are paid. Once fixed costs are fully covered, every additional contribution margin dollar is pure operating profit.

Understanding what the output tells you: If you sell fewer than 334 units in the above example, you lose money. Unit 335 onward generates $45 in operating profit each. At 500 units, you generate ($500 − 334) × $45 = $7,470 in operating profit on $37,500 in revenue — a 19.9% operating margin.

The SBA recommends adding a 10% buffer to projected fixed costs in break-even models to account for unpredictable expenses — making the adjusted break-even for this example $16,500 ÷ $45 = 367 units/month.

1. List and total all fixed costs. Fixed costs don't change with production volume. Common categories: rent/mortgage ($2,000–$20,000+/month depending on market and size), owner's salary or draw, salaried employee wages, insurance premiums, loan principal and interest, software subscriptions, and utilities with flat minimums. Be exhaustive — undershooting fixed costs is the most common reason break-even models fail. For a typical main-street retail business: $4,500 rent + $6,000 owner salary + $2,000 part-time staff + $800 insurance + $500 software + $700 utilities = $14,500/month in fixed costs.
2. Calculate variable cost per unit. Variable costs scale directly with each unit sold: materials, packaging, direct labor (if hourly), payment processing fees (typically 2.5–3%), shipping, and sales commissions. A candle business might spend $8/unit on wax, wick, and jar; $1.50 on packaging; $0.75 on payment processing (3% of $25 price); total variable cost = $10.25/unit.
3. Set your selling price per unit. If you have multiple products at different price points, use a weighted average selling price and weighted average variable cost. Alternatively, run separate break-even analyses for each product line to see which carries the weight of fixed costs most efficiently.
4. Enter the inputs and review break-even units. Using the candle example: $14,500 fixed ÷ ($25 − $10.25) = $14,500 ÷ $14.75 = 984 units/month. At a sales rate of 30 candles/day in a 31-day month, that's 930 units — just short of break-even. The business needs to sell 54 more candles/month (about 2/day) to reach profitability.
5. Analyze the margin of safety. If you currently sell 1,200 candles/month, your margin of safety is (1,200 − 984) ÷ 1,200 × 100 = 18%. A 18% revenue decline takes you back to break-even. A margin of safety below 10% is considered fragile; above 25% indicates financial resilience.
6. Model pricing and cost scenarios. Raise the selling price by $3 (from $25 to $28): CM rises from $14.75 to $17.75, break-even drops to $14,500 ÷ $17.75 = 817 units — 167 fewer units to break even. This illustrates why pricing is the most powerful lever in break-even management.
7. Validate against your SBA projections. The SBA's business plan template requires break-even analysis in the financial plan section. Ensure your model uses conservative revenue estimates (not best-case) and includes a 10–15% contingency on fixed costs.

The break-even point is a decision trigger, not just a number. Here is what the calculator's outputs mean for each type of decision.

Break-even units and revenue: These are your survival metrics. If current or projected sales cannot realistically reach break-even, the business model as structured is not viable. The solution is always one or more of: (1) reduce fixed costs, (2) reduce variable costs, (3) raise prices, (4) increase volume through marketing and sales investment.

Contribution margin ratio: The CMR tells you how efficiently revenue converts to fixed-cost coverage and profit. A 60% CMR means for every $1 in revenue, $0.60 goes toward covering fixed costs and profit; $0.40 goes to variable costs. High-CMR businesses (software, professional services) can scale profitably much faster than low-CMR businesses (retail, food manufacturing) because each incremental dollar of revenue yields more profit.

Margin of safety: A margin of safety above 20% is a comfortable buffer for most businesses. Below 10% and any revenue disruption — a bad quarter, a major customer loss, a seasonal dip — pushes the business into loss territory. Businesses with low margins of safety should prioritize fixed-cost reduction or revenue diversification.

Real-world example — restaurant: A 60-seat restaurant has monthly fixed costs of $32,000 (rent $8,000, food/labor for base operations $18,000, insurance/utilities $6,000). Average check is $45 with a 35% food cost → variable cost $15.75/customer. CM = $45 − $15.75 = $29.25/customer. Break-even = $32,000 ÷ $29.25 = 1,094 covers/month. Assuming 75 covers/day on average (2 service periods), the restaurant generates 2,250 monthly covers — a healthy margin of safety of (2,250 − 1,094) ÷ 2,250 = 51%. Per the SBA's restaurant management guidance, operators should track cover counts daily against the break-even threshold.

• Raise prices before cutting costs. A 5% price increase on a $50 product with $30 variable cost raises CM from $20 to $22.50 — a 12.5% improvement in margin per unit. If fixed costs are $10,000/month, break-even drops from 500 to 444 units — 56 fewer units/month. Price increases are often the fastest way to reduce break-even without operational disruption, and most businesses under-price relative to value delivered.
• Convert fixed costs to variable where possible. Every fixed cost that can be made variable reduces your break-even risk. Commission-based sales reps instead of salaried ones, usage-based software instead of flat subscriptions, part-time staff instead of full-time during slow periods — all of these shift costs from the fixed bucket to variable, lowering break-even in slow periods.
• Focus marketing on high-CM products. If your business sells both a $20 product with a $6 CM and a $50 product with a $30 CM, directing sales effort toward the $50 product covers fixed costs 5× faster per unit sold. Break-even analysis by product line reveals where to concentrate sales and marketing resources.
• Negotiate rent and lease terms. Rent is often the largest fixed cost and the hardest to reduce. For new leases, negotiate a period of reduced rent or percentage-of-revenue rent (common in retail) to lower your fixed-cost base during the ramp-up period. A $500/month rent reduction drops your break-even by $500 ÷ CMR. At a 50% CMR, that's $1,000 less in required monthly revenue.
• Track break-even weekly during growth phases. As you add employees, upgrade systems, or expand space, fixed costs jump in steps. Each step-up in fixed costs requires a corresponding increase in volume to maintain the same margin of safety. Model each major fixed-cost addition against your current sales run-rate before committing.
• Use break-even as a hiring trigger. Before adding a $5,000/month salaried employee, calculate how many additional units of revenue the role must generate to cover its cost plus a profit contribution. At a 60% CMR: the role must generate $5,000 ÷ 0.60 = $8,333/month in incremental revenue just to break even on the hire — before generating any return on the investment.