About the Absorption vs Variable Costing Calculator
This absorption costing calculator works out the cost of one unit of product and the period’s net operating income under both absorption (full) costing and variable (marginal) costing, then reconciles the two. Enter units produced and sold, the selling price, variable production costs per unit, fixed manufacturing overhead and selling and administrative costs.
Absorption costing — required for external reporting under US GAAP and IFRS — puts a share of fixed manufacturing overhead into every unit, so part of that overhead sits on the balance sheet in ending inventory when production exceeds sales. Variable costing expenses all fixed overhead in the period and is preferred for internal decisions, break-even and contribution-margin analysis.
Managers, cost accountants and students use the comparison to explain why reported profit can rise simply because more units were built than sold. The calculator assumes no opening inventory, so units sold cannot exceed units produced, and that fixed overhead is absorbed over the actual units produced.
With the default inputs, the net operating income — absorption is $94,000.00. Change any value above to recalculate instantly.
How to use the absorption vs variable costing calculator
- 1Enter units produced and units sold for the period.
- 2Enter the selling price and the variable production costs per unit.
- 3Enter total fixed manufacturing overhead.
- 4Add variable selling cost per unit sold and fixed selling and admin costs.
- 5Compare unit costs and income, and use the difference to reconcile the two statements.
Formula and method
Variable costing treats only direct materials, direct labor and variable manufacturing overhead as product costs. Fixed manufacturing overhead is a period cost, expensed in full. Absorption costing adds a share of fixed overhead to each unit — total fixed overhead divided by units produced — so the unit product cost is higher.
When more units are produced than sold, the absorption method holds some fixed overhead in ending inventory instead of expensing it, so it reports higher income. The gap equals fixed overhead per unit times the change in inventory units. Selling and administrative costs are always period costs under both methods. No opening inventory is assumed.
- DM, DL
- Direct materials and direct labor per unit
- VMOH
- Variable manufacturing overhead per unit
- FMOH
- Total fixed manufacturing overhead for the period
Worked examples
Building inventory: 10,000 made, 8,000 sold
Fixed overhead is $60,000 ÷ 10,000 = $6 a unit, so absorption cost is $24 + $6 = $30. Absorption income is $400,000 − $240,000 − $16,000 − $50,000 = $94,000. Variable income is contribution margin of $192,000 less $60,000 and $50,000 fixed costs = $82,000. The $12,000 gap is $6 × 2,000 units in inventory.
Production equals sales
With no change in inventory, all $60,000 of fixed overhead is expensed under both methods ($7.50 a unit under absorption), and both report $82,000 of income.
Small workshop
Fixed overhead is $40,000 ÷ 2,500 = $16 a unit, so absorption cost is $76. Absorption income is $240,000 − $152,000 − $12,000 − $30,000 = $46,000; variable income is $240,000 − $120,000 − $12,000 − $40,000 − $30,000 = $38,000. The $8,000 difference is $16 × 500 units.
Frequently asked questions
What is the difference between absorption and variable costing?+
Absorption costing includes fixed manufacturing overhead in the cost of each unit; variable costing treats it as a period expense. Both treat selling and administrative costs as period expenses.
Why does absorption costing show higher profit when inventory grows?+
Because part of the period’s fixed overhead is attached to unsold units and parked on the balance sheet. That overhead is expensed later when the units are sold, so profit shifts between periods.
Which method is required for financial statements?+
Absorption (full) costing is required for external financial reporting under both US GAAP (ASC 330) and IFRS (IAS 2), and for US tax inventory. Variable costing is used internally for decisions and performance evaluation.
How do you reconcile absorption and variable costing income?+
Multiply fixed manufacturing overhead per unit by the change in inventory units. Add it to variable costing income when inventory rises, or subtract it when inventory falls, to get absorption income.
Is variable costing the same as marginal costing?+
Yes. Variable costing (US term) and marginal costing (UK term) both treat only variable production costs as product costs and report a contribution margin.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.