Performance Management · Sales mix and quantity variances

Sales Mix and Quantity Variances Explained

Updated 11 October 2026 · Fact-checked

The sales mix and quantity variances split the total sales volume variance for a business selling several products. The mix variance shows the profit effect of selling a different proportion of products from budget. The quantity variance shows the effect of selling more or fewer units in total, at the budgeted mix.

Understand Sales Mix and Quantity Variances Overview

A business that sells one product has a simple sales volume variance: the difference between actual and budgeted units, multiplied by the standard profit per unit. With several products, that single figure hides two separate things. Managers may have sold more or fewer units overall. They may also have sold a different blend of products.

The sales quantity variance isolates the first effect. It asks: if we had sold the actual total units, but in the budgeted proportions, how much more or less profit would we have made than budgeted? The sales mix variance isolates the second. It asks: how much did the change in proportions move profit, given the actual total units sold?

The mix matters when products earn different margins. Selling more of a high-margin product gives a favourable mix variance. Selling more of a low-margin product gives an adverse one. If every product had the same margin, the mix variance would be zero.

The two variances always add up to the total sales volume variance. In PM, use the standard profit per unit under absorption costing, or the standard contribution per unit under marginal costing. Use whichever the question tells you to use.

The split is useful only when products are sold in a related way, such as a fixed range, and managers can influence the mix. If products are not substitutes or the mix is outside management control, the analysis tells you little.

Key rules to remember

Total sales volume variance: Σ (Actual units − Budgeted units) × Standard margin per unit; Calculate for each product and add up. Use standard profit (absorption) or standard contribution (marginal), as the question states.
Sales mix variance: Σ (Actual units − Actual total units in budget mix) × Standard margin per unit; Work product by product. Positive means more than the budget-mix share was sold, which is favourable only when multiplied by a positive margin.
Sales quantity variance: Σ (Actual total units in budget mix − Budgeted units) × Standard margin per unit; Same result as (Actual total units − Budgeted total units) × Budgeted average margin per unit.
Actual total units in budget mix: Total actual units × (Budgeted units of product ÷ Total budgeted units); This is the reference column that both variances use.
Check: Mix variance + Quantity variance = Sales volume variance; Always use this to test your answer.

How to solve Sales Mix and Quantity Variances Overview questions

Use a table with one row per product. This method works for any question on this topic.

1Write down budgeted units and standard margin per unit for each product. Confirm whether the margin is profit or contribution.
2Add up total budgeted units and total actual units.
3Work out the budget mix proportions: each product's budgeted units ÷ total budgeted units.
4Calculate actual total units in budget mix: total actual units × each proportion.
5Mix variance for each product: (actual units − actual total in budget mix) × standard margin. Mark each F if positive, A if negative. Add to get the total.
6Quantity variance for each product: (actual total in budget mix − budgeted units) × standard margin. Add to get the total.
7Calculate the total sales volume variance separately and check that mix + quantity equals it.
8Write a short comment: say which products drove the mix and whether the total change in volume helped profit.

Quickest way: Average margin shortcut for the quantity variance

When to use it: Use when you need both variances quickly and the budget total profit is easy to find.

Find budgeted total profit and total budgeted units. Divide to get the budgeted average margin per unit.
Quantity variance = (total actual units − total budgeted units) × budgeted average margin. Favourable if actual units are higher.
Work out the total sales volume variance: actual units at standard margin minus budgeted profit.
Mix variance = total volume variance − quantity variance.
Do a sense check: if sales shifted toward high-margin products, the mix should be favourable.

Common mistakes in Sales Mix and Quantity Variances Overview

Using actual units minus budgeted units in the mix variance.
It looks like the volume variance formula, so students reuse it.
Fix: The mix variance compares actual units with actual total units in budget mix. Build that reference column first.
Using the wrong margin, such as selling price or standard cost.
Students take the first per-unit figure in the data.
Fix: Use standard profit per unit for absorption costing or standard contribution per unit for marginal costing, as stated.
Getting the budget proportions wrong when totals differ.
Students apply actual proportions to the budget totals.
Fix: Proportions always come from the budget. Apply them to the actual total units.
Not checking that the two variances sum to the sales volume variance.
Students are short of time and skip the check.
Fix: Spend ten seconds on the total volume variance. If it does not agree, find the arithmetic slip.
Mislabelling favourable and adverse.
Students look only at the sign of the units and ignore the margin.
Fix: Variances in profit terms: a positive number is favourable. Check the final sign after multiplying by the margin.
Commenting that mix is controllable when products are not substitutes.
Students write generic comments.
Fix: Say that the variance is useful only if managers can influence the mix, such as through sales incentives or promotions.

Worked examples

Example 1

A company sells products A and B. Budget: A 600 units, standard profit ₹20 per unit; B 400 units, standard profit ₹50 per unit. Actual sales: A 500 units, B 600 units. Calculate the sales mix variance, the sales quantity variance and the total sales volume variance.

Show the solution

Total budgeted units = 1,000. Total actual units = 1,100. Budget mix is 60% A and 40% B.
Actual total units in budget mix: A = 1,100 × 60% = 660. B = 1,100 × 40% = 440.
Mix variance A: (500 − 660) × ₹20 = −₹3,200, adverse.
Mix variance B: (600 − 440) × ₹50 = +₹8,000, favourable. Total mix variance = ₹4,800 favourable.
Quantity variance A: (660 − 600) × ₹20 = ₹1,200 favourable.
Quantity variance B: (440 − 400) × ₹50 = ₹2,000 favourable. Total quantity variance = ₹3,200 favourable.
Check with total volume variance: A (500 − 600) × ₹20 = −₹2,000. B (600 − 400) × ₹50 = +₹10,000. Total = ₹8,000 favourable.
₹4,800 + ₹3,200 = ₹8,000, so the answer agrees.

Answer: Sales mix variance ₹4,800 favourable; sales quantity variance ₹3,200 favourable; total sales volume variance ₹8,000 favourable.

Example 2

Budget: X 200 units at standard profit ₹30 per unit; Y 300 units at standard profit ₹10 per unit. Actual: X 190 units, Y 260 units. Calculate the mix and quantity variances, and explain the result.

Show the solution

Total budgeted units = 500. Total actual units = 450. Budget mix is 40% X and 60% Y.
Actual total units in budget mix: X = 450 × 40% = 180. Y = 450 × 60% = 270.
Mix variance X: (190 − 180) × ₹30 = ₹300 favourable.
Mix variance Y: (260 − 270) × ₹10 = −₹100 adverse. Total mix variance = ₹200 favourable.
Quantity variance X: (180 − 200) × ₹30 = −₹600 adverse.
Quantity variance Y: (270 − 300) × ₹10 = −₹300 adverse. Total quantity variance = ₹900 adverse.
Check: budgeted profit = ₹6,000 + ₹3,000 = ₹9,000, so average margin = ₹18. Quantity variance = (450 − 500) × ₹18 = −₹900. Agrees.
Total volume variance: X (190 − 200) × ₹30 = −₹300. Y (260 − 300) × ₹10 = −₹400. Total = ₹700 adverse. Also ₹200 F − ₹900 A = ₹700 A.

Answer: Sales mix variance ₹200 favourable; sales quantity variance ₹900 adverse; total sales volume variance ₹700 adverse. The total fall in units hurt profit, but the shift toward the higher-margin product X reduced the damage.

Exam tips

In an OT question, you may be asked for only one of the two variances. Work out the actual total units in budget mix first, as both need it.
Read whether the question uses profit or contribution per unit. Using the wrong one gives a wrong answer and no partial marks in an objective test.
In a written part, always say what the number means: favourable or adverse, which product drove it, and whether it was controllable.
Show a small table and the check (mix + quantity = volume). This helps you catch errors and shows method for any marks given in a constructed response.
Link the mix variance to the margins. A favourable mix means the shift was toward higher-margin products.

Practice questions from Sales mix and quantity variances

Sales Mix and Quantity Variances Overview in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CMA FinalSales Variances

Sales Mix and Quantity Variances Overview: frequently asked questions

What is the difference between the sales mix variance and the sales quantity variance?

The mix variance measures the profit effect of selling a different proportion of each product from budget. The quantity variance measures the effect of selling a different total number of units at the budgeted mix. Together they make up the sales volume variance.

Why calculate a sales mix variance for multiple products?

It shows whether a change in profit came from selling more units overall or from selling more of the high-margin or low-margin products. This helps managers judge sales performance and decide on action, such as changing promotions.

Do I use profit or contribution per unit?

Use standard profit per unit if the business uses absorption costing. Use standard contribution per unit if it uses marginal costing. The question will tell you which to use.

Can the mix variance be favourable when total sales are below budget?

Yes. Total units may be lower, giving an adverse quantity variance, while the sales shifted toward higher-margin products, giving a favourable mix variance. The second worked example shows this.