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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.
The short run cost data of the firm shows that total fixed cost TFC (column 2) remains constant at $1000/- regardless of the level of output. The column 3 indicates variable cost which is associated with the level of output. Total variable cost is zero when production is zero.