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Formula of Variable Cost. The formula to calculate variable cost is: Total Variable Cost = Total Quantity of Output * Variable Cost Per Unit of Output. To recognize variable costs, it is important to understand how to categorize costs.Variable costs are those which do not remain constant, specifically when production activities fluctuate.ormula of Variable Cost. The formula to calculate variable cost is: Total Variable Cost = Total Quantity of Output * Variable Cost Per Unit of Output. To recognize variable costs, it is important to understand how to categorize costs.
Tips. 1  Long-run marginal costs differ from short-run in that no costs are fixed in the long run. 2  The general formula for calculating short-run marginal cost is: MC= d(TC)/d(Q) where TC is total cost, Q is quantity, and d signifies the change in these values.tep 3. Calculate the change in total cost when producing a given quantity of additional units. Total cost is equal to fixed costs plus variable costs. The change in total cost will be the new total cost after producing any additional units, minus the total cost before producing the units.