What if contribution margin is zero?

If price per unit is less than or equal to variable cost per unit, contribution margin is zero or negative. In that case, you cannot cover fixed costs at any sales volume—each sale fails to contribute to overhead. You must reduce costs, raise prices, or change the offer.

Can I include multiple products?

Yes, but you need to simplify. One option is to compute a weighted-average price and variable cost per unit based on your sales mix. Another option is to run separate break-even calculations for each product line and then compare.

How do I factor in marketing spend or CAC?

You can treat some marketing spend as fixed (baseline brand spend) and some as variable (per-order advertising). To approximate CAC on a per-unit basis, add an average per-sale marketing cost into your variable cost per unit.

Should I use monthly or yearly fixed costs?

Either works, as long as you are consistent. If you use monthly fixed costs, you will get a monthly break-even unit target. If you use yearly fixed costs, you will get an annual break-even target. Match the period to how you plan your business.

finance calculator

Break-Even Point Calculator

Calculate how many units or how much revenue you need to cover fixed costs.

Results

Break-even units: 625.00
Break-even revenue: $75,000 USD

Overview

Your break-even point is the level of sales where your total revenue exactly matches your total costs—no profit, but no loss. It is one of the simplest and most useful metrics for understanding whether a product, service, or business line is viable.

This break-even calculator helps you translate your fixed costs, price per unit, and variable cost per unit into a clear break-even target in both units and dollars. By adjusting price or costs and watching how the break-even point moves, you can stress-test your pricing strategy, cost structure, and sales goals before committing to a plan.

Founders, small-business owners, and product managers can use this as a quick “gut check” on unit economics before building a more complex financial model in a spreadsheet.

How to use this calculator

Enter your total fixed costs for the period you want to analyze (for example, per month or per year). Be consistent about the time frame.
Enter the selling price per unit for your product or service. If you sell bundles or packages, use the bundle price.
Enter the variable cost per unit, including all direct costs required to deliver one unit (materials, packaging, credit card fees, fulfillment, and direct labor if applicable).
Review the calculator’s contribution margin per unit (implicitly used) and the resulting break-even units—the number of units you need to sell to cover fixed costs.
Look at the break-even revenue figure to see how much total sales revenue you need to generate over the chosen period to hit break-even.
Adjust price, variable cost, or fixed costs to run “what-if” scenarios and evaluate different pricing, cost-cutting, or investment decisions.

Inputs explained

Fixed costs: Your overhead for the period you are analyzing that does not change directly with the number of units sold—examples include rent, full-time salaries, software subscriptions, insurance, and most utilities.
Price per unit: The amount you charge per unit sold. For services, treat one billable hour, session, or project as a “unit” and use the corresponding price. For bundles, use the bundle price and bundle-level costs.
Variable cost per unit: All costs that scale with each unit sold, such as raw materials, packaging, per-transaction payment processing fees, shipping that you pay, and direct hourly labor tied specifically to producing or delivering units.

Outputs explained

Break-even units: The number of units you must sell in the chosen period to cover all fixed and variable costs, assuming your price and cost assumptions hold. Selling more units than this will generate operating profit; fewer will generate a loss.
Break-even revenue: The total sales revenue (units × price) required to reach break-even. This is helpful if you think in terms of revenue targets rather than unit counts.

How it works

Fixed costs are expenses that do not change directly with units sold over the period you are analyzing—things like rent, salaried staff, software subscriptions, and insurance.

Variable cost per unit captures the expenses that scale with each unit sold, such as materials, packaging, payment processing fees, and direct labor tied to output.

Contribution margin per unit is calculated as Price per unit minus Variable cost per unit. It represents how much each sale contributes to covering fixed costs and then to profit.

Break-even units are computed as Fixed costs ÷ Contribution margin per unit. This is the minimum number of units you must sell to cover fixed costs, assuming your price and variable costs stay constant.

Break-even revenue is simply Break-even units multiplied by Price per unit, giving you a revenue target instead of a unit target.

Because the formulas are linear, you can see exactly how changes in price, costs, or overhead shift the break-even point up or down.

Formula

Contribution margin per unit = Price per unit − Variable cost per unit

Break-even units = Fixed costs ÷ Contribution margin per unit

Break-even revenue = Break-even units × Price per unit

Where:
- Fixed costs are overhead for the chosen period (for example, per month or per year).
- Variable cost per unit includes all direct costs tied to producing or delivering one unit.
- Price per unit is the selling price per unit before tax.

When to use it

Testing different price points to see how many sales you would need to cover your monthly or annual overhead.
Planning production and sales targets for a new product launch or new service line before scaling marketing and inventory.
Comparing alternative business models (for example, higher fixed costs and lower variable costs vs. lower fixed costs and higher variable costs).
Helping founders and operators sense-check whether a proposed cost structure and expected demand level are realistic.
Using break-even as a milestone when presenting financial projections to investors, lenders, or internal stakeholders.

Tips & cautions

Keep your unit definition consistent: if you sell in packs of 6 or 12, treat one pack as a unit and use pack-level price and costs.
For ecommerce businesses, don’t forget to include payment processing fees, packaging, and shipping subsidies in your variable costs.
If you pay sales commissions that scale with revenue, include them in variable cost per unit so the contribution margin reflects reality.
Run optimistic, base, and pessimistic scenarios by adjusting price, variable cost, and fixed costs to see how robust your economics are.
Revisit your break-even analysis when your cost structure changes materially—for example, after hiring, renegotiating rent, or changing suppliers.
Assumes a single product or a representative blended unit; it does not separately model a product mix with different margins.
Treats price and variable cost as constant across all units, which may not be accurate if you use tiered pricing, discounts, or volume-based supplier pricing.
Does not explicitly include customer acquisition cost per unit; you can approximate by adding an average CAC per sale into the variable cost.
Ignores taxes, financing costs, inventory carrying costs, and seasonal variations unless you fold them into fixed or variable costs yourself.
Provides a static snapshot for a chosen period and does not model dynamic changes in demand or costs over time.

Worked examples

$50k fixed, $120 price, $40 cost

Fixed costs = $50,000 for the year.
Price per unit = $120 and variable cost per unit = $40, so contribution margin per unit = $120 − $40 = $80.
Break-even units = $50,000 ÷ $80 ≈ 625 units.
Break-even revenue = 625 × $120 ≈ $75,000 in sales.

Increase price to $150

Keep fixed costs at $50,000 and variable cost per unit at $40.
Raise price per unit to $150, so contribution margin per unit becomes $150 − $40 = $110.
New break-even units = $50,000 ÷ $110 ≈ 455 units (rounded).
With a higher price and the same cost structure, you need significantly fewer units to reach break-even.

Tight margin scenario with higher variable costs

Fixed costs remain $50,000, price per unit is $120, but variable cost per unit rises to $80.
Contribution margin per unit = $120 − $80 = $40.
Break-even units = $50,000 ÷ $40 = 1,250 units.
The required sales volume doubles compared to the original case, illustrating how rising variable costs push break-even higher.

Deep dive

Find your business break-even point by entering fixed costs, selling price per unit, and variable cost per unit to see the units and revenue required to cover your overhead.

Ideal for startups, ecommerce brands, and service businesses that want a quick break-even analysis without building a full spreadsheet model.

FAQs

What if contribution margin is zero?: If price per unit is less than or equal to variable cost per unit, contribution margin is zero or negative. In that case, you cannot cover fixed costs at any sales volume—each sale fails to contribute to overhead. You must reduce costs, raise prices, or change the offer.
Can I include multiple products?: Yes, but you need to simplify. One option is to compute a weighted-average price and variable cost per unit based on your sales mix. Another option is to run separate break-even calculations for each product line and then compare.
How do I factor in marketing spend or CAC?: You can treat some marketing spend as fixed (baseline brand spend) and some as variable (per-order advertising). To approximate CAC on a per-unit basis, add an average per-sale marketing cost into your variable cost per unit.
Should I use monthly or yearly fixed costs?: Either works, as long as you are consistent. If you use monthly fixed costs, you will get a monthly break-even unit target. If you use yearly fixed costs, you will get an annual break-even target. Match the period to how you plan your business.

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This break-even point calculator is for planning and educational purposes only. It uses a simplified cost structure and assumes stable prices, costs, and demand, which rarely hold perfectly in real businesses. Do not rely on this tool as your sole basis for pricing, capital investment, or financing decisions. Always build a more detailed financial model and consult with qualified financial or accounting professionals before making significant business commitments.