Separate your costs
Use one period, currency and a consistent unit of sale.
Break-even quantity
calculator.
Know the target behind the idea.
Compare what you charge, what each unit costs and what you need to cover each month.
Enter your costs and price
USD · per monthMinimum whole units to cover costs
67 whole units
Exact crossing: 200/3 ≈ 66.6667 units
Contribution: USD 15 per unit
Revenue at 67USD 1,675
Total cost at 67USD 1,670
Surplus at 67: USD 5 · Loss at 66: USD 10
Monthly revenue and total cost (USD)
Revenue = 25qTotal cost = 1000 + 10q
One product and entered costs; constant price/cost over this range. Not a sales forecast.
How it works
Find contribution
Subtract variable unit cost from the selling price.
Round up whole units
Divide fixed cost by contribution; round up to a whole unit.
Worked example
25 − 10 = USD 15Contribution per unit
1000 ÷ 15 ≈ 66.6667Continuous crossing
Round up to 67Minimum whole units
Questions, Answered.
Why round up to whole units?
The continuous crossing is 66.6667 units. At 66 units the model loses USD 10; 67 whole units cover the entered costs, leaving USD 5.
What if price does not cover unit cost?
With positive fixed costs and zero or negative contribution, no finite positive sales quantity covers the entered costs. If fixed costs are zero, the model explains the zero-quantity or all-quantity boundary separately.
Does this predict my sales?
No. This is an entered-cost model. It does not forecast demand, conversion, capacity or your business’s actual profit.
Can I compare a different period?
This tool labels every entry and result in USD per month. Convert all fixed costs and comparison quantities to the same month before using it.