Sales Mix Contribution CalculatorFree online financial calculator — instant results, no sign-up
Calculate weighted unit contribution and break-even volume for a fixed two-product sales mix.
Estimates only, based on the inputs and assumptions shown. This is not financial, investment, tax, or legal advice. Prices, rates and local rules may change; crypto scenarios do not predict returns. Confirm important decisions with a qualified professional.
Sign in to save results and favorites.
About the Sales Mix Contribution Calculator
The Sales Mix Contribution Calculator estimates the average contribution per unit and the break-even sales volume for a fixed mix of two products. It combines each product’s contribution per unit with Product A’s share of unit sales, then calculates how many mixed units are needed to cover fixed costs.
- Product A contribution per unit ($)
- The dollar amount each unit of Product A contributes toward fixed costs and profit after variable costs, with a default of $20.
- Product B contribution per unit ($)
- The dollar amount each unit of Product B contributes toward fixed costs and profit after variable costs, with a default of $35.
- Product A share of unit sales (%)
- The percentage of total units sold that are Product A, with a default of 60% and the remaining share assigned to Product B.
- Fixed costs ($)
- The total fixed costs in dollars to cover over the sales period being analyzed, with a default of $30,000.
Formula and method
s = p_A / 100; C_w = C_A × s + C_B × (1 − s); Q_BE = ceil(F / C_w), provided C_w > 0. With the default inputs: C_w = $20 × 0.60 + $35 × 0.40 = $26.00; Q_BE = ceil($30,000 / $26.00) = 1,154 mixed units.
- C_AProduct A contribution per unit, in dollars.
- C_BProduct B contribution per unit, in dollars.
- p_AProduct A share of total unit sales, expressed as a percentage.
- sProduct A share expressed as a decimal; 1 − s is Product B’s share.
- C_wWeighted contribution per unit across the two-product sales mix, in dollars.
- FFixed costs for the period, in dollars.
- Q_BEBreak-even total units across both products, rounded upward to a whole unit.
- ceilThe ceiling function, which rounds a value upward to the next whole number unless it is already whole.
Convert Product A’s percentage share to a decimal and subtract it from 1 to obtain Product B’s share. Multiply each product’s contribution per unit by its share, then add the results to get weighted contribution per unit. Divide fixed costs by that weighted contribution and round upward to obtain break-even mixed units; use the unrounded weighted contribution in the division.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Product A contribution per unit20 $
- Product B contribution per unit35 $
- Product A share of unit sales60 %
- Fixed costs30000 $
Results
- Weighted contribution per unit$26.00
- Break-even mixed units1,154
How to use the Sales Mix Contribution Calculator
- 1Enter Product A’s contribution per unit, calculated as its selling price minus its variable cost per unit; the default is $20.
- 2Enter Product B’s contribution per unit using the same cost basis; the default is $35.
- 3Enter Product A’s share of total unit sales; the default of 60% leaves 40% for Product B.
- 4Enter fixed costs for the period you are planning; the default is $30,000.
- 5Read the results: the default inputs produce a weighted contribution per unit of $26.00 and break-even mixed units of 1,154.
Reading your result
Weighted contribution per unit is the average amount each unit sold contributes toward fixed costs and then profit, assuming the specified mix holds. The default result of $26.00 is a mix-weighted average, not either product’s individual contribution. Break-even mixed units is the combined sales volume of Products A and B, not the number required for each product separately. The default result of 1,154 is the upward-rounded total needed to cover $30,000 of fixed costs under the weighted-average model.
Limitations
The model assumes constant contribution per unit, unchanged fixed costs, and a stable unit-sales mix over the relevant volume range. Product A’s share must be between 0% and 100%, and fixed costs should be nonnegative. A positive weighted contribution is required for the break-even division; a zero or negative value cannot cover positive fixed costs. The calculator does not account for capacity limits, step costs, discounts, or changes in variable costs. Rounding total units upward does not ensure an exact whole-unit allocation between products: with the default 60%/40% mix, an exact allocation requires total sales in multiples of five, so 1,154 is a weighted-average planning threshold rather than an exact product-level sales plan.
Common questions
Why is there no separate input for Product B’s sales share?+
This calculator assumes only two products, so their unit-sales shares must total 100%. With Product A at the default 60%, Product B automatically accounts for 40%.
Should Product A’s 60% share be based on revenue or units?+
Use units sold, not revenue. The calculation weights contribution per unit by each product’s proportion of total units; revenue shares can produce a misleading weighted contribution.
Does the default break-even result mean selling 1,154 units of each product?+
No. It means 1,154 total units across both products under the assumed mix. Because that total cannot be split into whole units at exactly 60%/40%, an operational sales plan must also account for whole-product quantities.
What happens to break-even volume if Product A’s share increases?+
With the default contributions of $20 for Product A and $35 for Product B, increasing Product A’s share lowers weighted contribution per unit. With fixed costs unchanged at $30,000, the underlying break-even volume rises, although whole-unit rounding may hide very small changes.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
You might also like
Microloan Financing Calculator
Calculate amortizing microloan payments and total cost including an upfront fee.
Invoice Factoring Cost Calculator
Calculate a flat factoring fee, initial advance and reserve release on invoice collection.
Merchant Cash Advance Cost Calculator
Calculate a factor-rate advance's total repayment and equal daily remittance.
Equipment Financing Calculator
Estimate fixed payments for equipment purchased with a down payment.
Fleet Lease Versus Buy Cost Calculator
Compare undiscounted fleet lease costs with cash purchase costs net of resale value.
Business Credit Line Interest Calculator
Estimate interest and an unused-line fee from constant average balances.
Results are estimates for informational purposes and are not financial, medical or legal advice.