"What is contribution margin? (and why it beats guessing)"
Contribution margin is what is left from one sale after every cost that came with that sale, and it tells you what each order truly adds toward your bills and profit.
Ask a seller whether a product is profitable and they often answer from feel. Price Rs 799, cost Rs 300, so that is Rs 499 profit, right? Not quite. Many costs hide between the price and the money you really keep. Contribution margin is the tool that makes them visible.
The definition
Contribution margin per order is the selling price minus the variable costs of that order. Variable costs are those that happen only because the order happened. What remains goes toward your fixed costs, such as tools and rent, and then toward profit.
A Rs 799 product, step by step
Let us use a made-up example. The numbers below are illustrative, not real rates. Please replace them with your own, and check actual charges with your payment provider and courier.
Say you sell a printed tote bag for Rs 799.
- Product cost, what it costs you to make or buy: Rs 300.
- Packaging, a mailer and a thank-you card: Rs 30.
- Shipping you pay on the parcel: Rs 70.
- Payment charge on that order: Rs 20.
Add the variable costs: 300 + 30 + 70 + 20 = Rs 420.
Contribution = 799 minus 420 = Rs 379.
As a share of price, 379 divided by 799 is about 47 percent. So the naive view said Rs 499 profit, and the fuller view says Rs 379 contribution. The Rs 120 gap is made of packaging, shipping and payment costs that a quick sum forgets.
Why it beats guessing
Once you know contribution per order, many decisions become simple arithmetic.
- Discounts. A Rs 100 discount takes this order from Rs 379 to Rs 279. That is a big bite. How a 10 percent discount hits profit shows it in more detail.
- Free shipping. If you offer it, shipping moves from the customer's cost to yours. Contribution drops accordingly.
- Ads. The most you can pay to win a customer on a first order is below the contribution of that order. Maximum CAC from first order contribution explains this.
- Break-even. Divide your fixed costs by contribution to find the number of orders you need. See what is break-even.
Costs people forget to include
Check your own list for these.
- Returns and refunds. A bad order can wipe out the contribution of several good ones.
- COD handling charges and failed deliveries.
- Free gifts or samples.
- Packaging that is more than a box, such as tissue, stickers and cards.
- Photo and sample costs spread across units sold. Photo and sample cost per unit sold shows how.
I will not say what typical shipping or payment charges are. Take them from your own statements and invoices, and update them when they change.
How to keep it handy
Make a small sheet with one row per product and columns for price, product cost, packaging, shipping estimate, payment charge and contribution. Add one more column for contribution as a share of price. Sort by the last column. The products at the top are the ones to push. Those at the bottom may need a price rise, a cheaper pack or a quiet retirement.
Contribution margin per order, a worked example gives another version of the same idea.
Guessing feels fine until the bank balance disagrees. A short sheet with honest inputs gives you an answer you can trust before you spend on ads, cut a price or promise free delivery.