Cost of Doing Business Calculator
From fixed cost, variable cost and units produced, compute the total cost and the cost per unit.
Input Data
Results
At a glance:Total cost = fixed cost + variable cost; cost per unit = total cost / units. It decomposes operating cost into volume-independent (rent, payroll) and volume-dependent (materials, commission) parts. In Hong Kong, high fixed costs (rent, wages) mean volume is key to lowering unit cost — the more units, the more fixed cost is spread. Core of unit economics and break-even. WARNING: variable cost is total, not per unit; match period/capacity and classify costs correctly. Education, not advice.
Formula
Total cost = fixed cost + variable cost.
Cost per unit = total cost / units.
$$TC = FC + VC$$$$CPU = \dfrac{TC}{Q}$$How to Use
- Enter the fixed cost for the period.
- Enter the total variable cost.
- Enter the number of units to see total cost and unit cost.
FAQ
What is the difference between fixed and variable cost?
Fixed costs stay roughly constant in the period (rent, salaried payroll, insurance, depreciation); variable costs move with volume (materials, piece wages, commissions, usage-based utilities). Mixed costs must be split. Classification is relative to the period and capacity range.
How does this relate to unit economics and break-even?
Unit cost = total cost / units; compare with selling price for gross margin. Break-even units = fixed cost / (price - unit variable cost) — once exceeded, each unit contributes profit. Lower unit cost (via higher volume) widens the margin.
Why is unit cost lower at higher volume?
Because fixed cost is spread over more units — fixed cost per unit falls as volume rises, a scale effect (economies of scale). At very high volume, fixed cost per unit approaches zero but variable cost per unit stays, so unit cost converges to variable cost per unit.
What is the Hong Kong context for cost of doing business?
Hong Kong's high commercial rent and wages make fixed costs a heavy burden for SMEs (shops, F&B, studios) — so volume and pricing discipline are critical; low sales can't cover fixed costs and quickly turn losses. The HKTDC and HKPC offer SME support and benchmarks; pair with the break-even and contribution-margin calculators. Education, not advice.
What does 'units' mean, and is higher volume always better?
'Units' is the quantity produced/sold in the period, in any unit (pieces, orders, service hours). Higher volume lowers unit cost via spreading fixed cost, but only if sold at a profit — if the selling price is below total unit cost, more volume means more loss. Also watch capacity: beyond capacity, fixed cost jumps (new shop, more staff) and unit cost rises again. So 'higher volume lowers unit cost' holds within a capacity range; the goal is the profitable volume that clears break-even, not volume at any cost.
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References
Content review: Calculatorism Finance Team. Results are for reference only; please refer to the relevant authorities for the official figures.