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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.
By dividing the total variable costs for a specific period by that same period's production volume will provide us with the variable cost per spark plug. For example, if the spark plug business made 500,000 units last year, its unit variable cost is $90,000 / 500,000, or $0.18.he 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.