Calculate the theoretical break-even point and minimum whole sellable units, plus target-profit volume, contribution margin, and signed margin of safety.
A quick decision brief for this specific tool
Fixed costs, selling price and variable cost per unit, with optional target profit and planned unit volume
Theoretical break-even intersection, minimum whole sellable units, revenue at that whole-unit threshold, contribution margin, target-profit units, and signed margin of safety
Fixed costs divided by unit contribution margin; operational unit requirements are rounded up while the chart preserves the fractional theoretical intersection
Choose your path
Convert fixed and per-unit economics into a reproducible theoretical intersection and an actionable minimum whole-unit sales threshold.
Know the minimum sellable volume before expecting profit.
Enter fixed costs, selling price, and variable cost; compare the fractional intersection with the rounded-up operating threshold.
Uses 334 rather than rounding 333.33 down to 333 and understands which cost assumptions need verification.
Translate a desired profit into a minimum sales quantity.
Add a non-negative target profit and review contribution margin, whole units, and threshold revenue.
Receives a ceiling-rounded unit requirement and can reproduce it from the displayed formula.
See whether planned capacity is above or below break-even.
Enter target units and inspect the signed margin of safety alongside target-profit units.
A below-threshold plan appears as a negative shortfall, not a blank or positive-looking result.
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The break-even point is where total revenue equals total costs. Each unit sold above this point generates profit.
BEP (units) = Fixed Costs ÷ (Price per Unit − Variable Cost per Unit)Contribution margin is the amount each unit contributes toward covering fixed costs after variable costs are paid.
Contribution Margin = Price − Variable CostThe formula can return a fractional intersection, but most products cannot be sold fractionally. The operational threshold therefore rounds units up and calculates revenue at that whole-unit quantity.
Minimum whole units = ceil(Fixed Costs ÷ Contribution Margin)Updated: August 2026
A café sells lattes at $5 with $1.50 ingredient cost. Calculate how many drinks needed to cover rent and salaries.
→ Break-even: ~2,286 drinks/month (~76/day)
A software startup charges $49/month with $3/month server cost per user.
→ Break-even: ~326 subscribers
A professional uses the Break-Even Calculator during client work to produce accurate numbers quickly without opening a spreadsheet.
Include all fixed costs: rent, insurance, salaries, software subscriptions, and depreciation. Underestimating fixed costs makes break-even look easier than it is.
Each product has its own contribution margin. Calculate break-even per product line, not with blended averages across different margins.
Model a single-product or blended-unit break-even scenario, inspect the fractional intersection and actionable whole-unit threshold, then test price and variable-cost sensitivity. Validate cost classification, demand, and capacity before making a decision.