How do I calculate contribution margin for my manufacturing startup?
Quick answer
Take the selling price of a unit and subtract the variable costs of making it — raw materials, direct labour, and variable factory costs like power and consumables. What's left contributes toward your (factory, machinery) and profit.
How to calculate it
Contribution margin = selling price per unit − variable cost per unit. For manufacturing, variable costs are the ones that rise with each unit made: raw materials, direct labour tied to production, packaging, and variable overheads like electricity and consumables. Your factory rent, machinery depreciation and supervisor salaries are fixed — they don't change with each unit, so they sit below contribution margin.
An example
You sell a unit for ₹1,000. Raw materials ₹400, direct labour ₹150, packaging ₹50, variable power/consumables ₹50 — ₹650 variable cost. Contribution margin = ₹350, or 35%. That ₹350 per unit goes toward covering your fixed factory costs. If your fixed costs are ₹7,00,000/month, you need to sell 2,000 units a month just to (₹7,00,000 ÷ ₹350).
Our honest take
Manufacturing runs on thin margins and high volumes, so knowing your exact variable cost per unit is non-negotiable. A ₹20 error per unit becomes huge at volume — precision here is survival.