A brand doubles its orders in a year. Everyone celebrates. Then the founder looks at the bank account and wonders why there’s less money than before. The answer almost always lives in one number most marketers never calculate.
Summary
Contribution margin is the money left from each sale after you subtract every cost that rises with that sale, such as product cost, shipping, packaging, payment fees and returns. It shows whether each order actually makes money before fixed costs like rent and salaries. Indian D2C brands often split it into CM1, CM2 and CM3 to see where the money leaks.
Internet Culture · Glossary · 004
Also known as: unit margin, CM
Related to: unit economics, customer acquisition cost, gross margin, payback period
1 Contribution margin in plain words
You sell a ₹1,000 face serum. It feels like you made ₹1,000.
You didn’t. The product itself cost money to make. Then you paid for the box, the delivery, the payment gateway, and the customer who sent it back. Then you paid Instagram to find that customer in the first place.
What’s left after all of that is your contribution margin. It’s the money each order contributes towards paying your rent, salaries and, eventually, profit.
Revenue tells you how big you are. Contribution margin tells you whether getting bigger is a good idea.
2 What is the contribution margin formula?
The basic contribution margin formula is simple:
Contribution margin = Revenue − Variable costs
As a percentage:
Contribution margin % = (Revenue − Variable costs) ÷ Revenue × 100
The key word is variable. Variable costs go up every time you make a sale. Fixed costs stay the same whether you sell ten orders or ten thousand.
| Variable costs (include these) | Fixed costs (leave these out) |
|---|---|
| Product or manufacturing cost | Office rent |
| Packaging | Salaries |
| Shipping and delivery | Software subscriptions |
| Payment gateway fees | Founder’s laptop |
| Returns and refunds | Brand shoot from last year |
| Marketing spent per order (in CM3) | Annual audit fees |
3 What are CM1, CM2 and CM3?
Many Indian D2C founders and investors break contribution margin into three layers. Each one subtracts another group of costs, so you can see exactly where the money goes.
CM1 = Revenue − Product cost. This is close to gross margin. It tells you if the product itself is priced well.
CM2 = CM1 − Fulfilment costs. Subtract packaging, shipping, payment fees and returns. This tells you if you can get the product to the customer without bleeding money.
CM3 = CM2 − Marketing per order. Subtract what you spent on ads and promotions to win that order. This tells you if the whole engine works.
A worked example
Here’s an illustrative example for a D2C skincare brand. These are made-up numbers to show the method, not real company data.
1 Contribution margin in plain words
You sell a ₹1,000 face serum. It feels like you made ₹1,000.
You didn’t. The product itself cost money to make. Then you paid for the box, the delivery, the payment gateway, and the customer who sent it back. Then you paid Instagram to find that customer in the first place.
What’s left after all of that is your contribution margin. It’s the money each order contributes towards paying your rent, salaries and, eventually, profit.
Revenue tells you how big you are. Contribution margin tells you whether getting bigger is a good idea.
§2 What is the contribution margin formula?
The basic contribution margin formula is simple:
Contribution margin = Revenue − Variable costs
As a percentage:
Contribution margin % = (Revenue − Variable costs) ÷ Revenue × 100
The key word is variable. Variable costs go up every time you make a sale. Fixed costs stay the same whether you sell ten orders or ten thousand.
| Variable costs (include these) | Fixed costs (leave these out) |
|---|---|
| Product or manufacturing cost | Office rent |
| Packaging | Salaries |
| Shipping and delivery | Software subscriptions |
| Payment gateway fees | Founder’s laptop |
| Returns and refunds | Brand shoot from last year |
| Marketing spent per order (in CM3) | Annual audit fees |
§3 What are CM1, CM2 and CM3?
Many Indian D2C founders and investors break contribution margin into three layers. Each one subtracts another group of costs, so you can see exactly where the money goes.
CM1 = Revenue − Product cost. This is close to gross margin. It tells you if the product itself is priced well.
CM2 = CM1 − Fulfilment costs. Subtract packaging, shipping, payment fees and returns. This tells you if you can get the product to the customer without bleeding money.
CM3 = CM2 − Marketing per order. Subtract what you spent on ads and promotions to win that order. This tells you if the whole engine works.
A worked example
Here’s an illustrative example for a D2C skincare brand. These are made-up numbers to show the method, not real company data.
THE LAST RUPEE TEST
After every cost that comes with an order is paid, how many rupees are actually left? If you can’t answer that in one number, you don’t know if your growth is helping or hurting.
Rule 1. Count every variable cost. Returns, COD failures, discounts and payment fees are easy to forget and expensive to ignore.
Rule 2. Check CM3, not just CM1. A great product margin means nothing if delivery and ads eat all of it.
Rule 3. Grow only what leaves money behind. If CM3 is negative, more orders means faster losses.
4 Why contribution margin matters for marketers
It tells you how much you can spend on ads. If CM2 is ₹450, every rupee you spend acquiring a customer comes out of that ₹450. Spend more than CM2 on one order and that order loses money, unless the customer comes back to buy again.
It changes which products you push. Two products might sell equally well. If one has a CM2 of ₹500 and the other ₹150, your ad money should usually go to the first.
It explains why discounts hurt so much. A ₹200 discount on a ₹1,000 order doesn’t cut your margin by 20%. In the example above, it cuts CM3 from ₹150 to nothing below zero. Discounts come straight out of the last rupee.
It makes repeat customers obvious heroes. A second order usually costs far less marketing to win. That means CM3 on repeat orders can be much higher. Contribution margin is how you prove retention is worth investing in.
5 The costly mistake: calling revenue “margin”
The most common mistake is celebrating revenue growth without checking contribution margin.
A brand runs a big sale. Orders triple. The team is thrilled. But every sale order carried a deep discount, free shipping and extra ad spend. CM3 went negative. The brand worked three times as hard to lose more money.
Three more mistakes that show up often in Indian D2C:
Forgetting returns and RTO. In cash on delivery heavy markets, a real share of orders comes back undelivered. Return to origin (RTO) costs you shipping both ways and sometimes the product. If you don’t include it, your margin is a fantasy.
Ignoring marketplace and quick commerce fees. Selling on marketplaces or quick commerce apps often brings commissions and listing fees. Those belong in your variable costs.
Mixing fixed and variable costs. Putting salaries into contribution margin makes it hard to see if the order itself works. Keep fixed costs separate, then check if the total contribution covers them.
6 How to use contribution margin on Monday
- List every cost that rises with one order. Ask your ops and finance teams. They’ll know the ones you forgot.
- Calculate CM1, CM2 and CM3 for your top three products.
- Compare your ad cost per order against CM2. If ads cost more, you’re relying on repeat purchases to break even. Check that customers actually come back.
- Check what your last sale did to CM3, not just revenue.
- Put CM3 next to revenue in every monthly report. The conversation in the room will change.
7 Frequently asked questions
What is contribution margin in simple terms?
Contribution margin is the money left from each sale after paying every cost that comes with that sale, such as product cost, shipping, packaging, payment fees and returns. It shows how much each order contributes towards fixed costs and profit.
What is the contribution margin formula?
The contribution margin formula is revenue minus variable costs. As a percentage, it is revenue minus variable costs, divided by revenue, multiplied by 100.
What are CM1, CM2 and CM3?
CM1 is revenue minus product cost. CM2 subtracts fulfilment costs like shipping, packaging, payment fees and returns. CM3 also subtracts marketing spent per order. Indian D2C brands use these layers to see exactly where margin is lost.
What is the difference between gross margin and contribution margin?
Gross margin usually only subtracts the cost of making the product. Contribution margin subtracts every variable cost tied to a sale, including delivery, returns and often marketing. Contribution margin is a more honest view of whether each order makes money.
What is a good contribution margin for a D2C brand?
It depends on the category, price and how often customers repeat. In general, a positive CM3 on first orders is a strong sign, and many brands aim to reach positive CM3 at least by the second order. A negative CM3 that never improves with repeat orders is a warning sign.
Related terms
Customer Acquisition Cost · Unit Economics · Gross Margin · Payback Period · Average Order Value
