Monthly Break-Even Point Formula
Learn how monthly break-even sales volume, revenue, contribution margin, and expected profit or loss are calculated.
A monthly break-even calculation estimates the sales volume at which a business covers its monthly fixed costs and the variable costs attached to each sale. It helps translate pricing and cost information into a practical monthly sales target.
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Monthly Break-Even Sales Volume
Where:
First find how much each sale contributes after its direct variable cost. Then divide monthly fixed costs by that amount to estimate the number of sales needed to break even.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| monthlyFixedCosts - Monthly fixed costs | Monthly costs that generally do not change directly with the number of units sold, such as rent, salaries, insurance, and software. | currency |
| sellingPricePerUnit - Selling price per unit | The average amount charged for one unit, product, job, or service sale. | currency |
| variableCostPerUnit - Variable cost per unit | The direct cost that generally increases with each additional unit sold. | currency |
| contributionMarginPerUnit - Contribution margin per unit | The amount from each sale available to cover fixed costs and then profit. | currency |
| expectedMonthlyUnitSales - Expected monthly unit sales | The planned or expected number of units sold during a typical month. | number |
Step-by-Step Calculation
Calculate contribution margin per unit
Subtract the direct variable cost of one unit from its selling price.
contributionMarginPerUnit = sellingPricePerUnit - variableCostPerUnit
Calculate the contribution margin ratio
This shows the proportion of each sales amount remaining after variable costs.
contributionMarginRatio = contributionMarginPerUnit / sellingPricePerUnit
Calculate break-even units
Divide monthly fixed costs by the contribution from one sale. If whole units must be sold, round the result up to the next whole unit.
breakEvenUnits = monthlyFixedCosts / contributionMarginPerUnit
Calculate break-even revenue
Multiply the break-even sales volume by the average selling price per unit.
breakEvenRevenue = breakEvenUnits * sellingPricePerUnit
Calculate expected monthly revenue
Multiply expected sales volume by the selling price.
expectedMonthlyRevenue = expectedMonthlyUnitSales * sellingPricePerUnit
Calculate expected monthly profit or loss
Contribution from expected sales covers fixed costs first; any amount left is estimated profit, while a negative result is an estimated loss.
expectedMonthlyProfit = (expectedMonthlyUnitSales * contributionMarginPerUnit) - monthlyFixedCosts
Example: Monthly break-even for a product business
Contribution margin per unit
$50 - $20
$30 per unit
Contribution margin ratio
$30 / $50
0.60 or 60%
Break-even units
$10,000 / $30
333.33 units
Break-even revenue
333.33 × $50
About $16,667 per month
Expected profit
(500 × $30) - $10,000
$5,000 per month
Sales volume gap
500 - 333.33
About 166.67 units above break-even
Final Result
The estimated monthly break-even point is about 334 units and $16,667 in revenue. At 500 unit sales, estimated monthly profit is $5,000.
Assumptions
- ✓All entered costs and sales relate to one typical month.
- ✓The selling price and variable cost are representative averages for the sales mix.
- ✓Fixed costs remain unchanged within the sales range being evaluated.
- ✓Each additional unit sold creates the same contribution margin per unit.
- ✓Taxes, financing costs, and costs not entered are excluded.
Limitations
- !Actual sales may include discounts, returns, refunds, or unpaid invoices that reduce realized revenue.
- !A business with several products may need a weighted average contribution margin rather than one single-unit figure.
- !Fixed costs can change in steps, such as when additional staff, equipment, or premises are required.
- !The calculation does not measure cash timing, inventory purchases, or payment terms.
- !A break-even result is not meaningful when selling price is equal to or lower than variable cost per unit.
Common Mistakes to Avoid
Entering annual fixed costs instead of monthly fixed costs.
Treating all costs as fixed when materials, delivery, commissions, or payment processing fees increase with sales.
Using a list price that does not reflect regular discounts or average realized selling price.
Rounding break-even units down when only whole units can be sold.
Mixing tax-inclusive prices with tax-exclusive costs.
Assuming that break-even revenue is the same as profit; at break-even, estimated profit is zero.
Related Formulas
Frequently Asked Questions
What is the formula for monthly break-even point?
Monthly break-even units equal monthly fixed costs divided by contribution margin per unit. Contribution margin per unit is selling price minus variable cost per unit.
How do I calculate break-even revenue per month?
Multiply break-even units by the average selling price per unit. The result estimates the monthly revenue needed to cover entered costs.
Should break-even units be rounded up?
Usually, yes. If sales can only occur in whole units, round up because a fraction of a unit may not be enough to fully cover fixed costs.
What is contribution margin per unit?
It is the selling price of one unit minus its variable cost. It is the amount available to cover fixed costs and, after those are covered, profit.
What happens if variable cost is higher than selling price?
Contribution margin is zero or negative, so additional sales do not cover fixed costs under the entered assumptions. Review the price and variable-cost figures.
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