Quick Commerce Ads ROAS Calculator: Break-Even ROAS After Margin and Platform Fees

ROAS is the revenue your ad campaign brings in divided by what you spent on it. On Blinkit, Zepto or Instamart, the number that matters is break-even ROAS: 1 divided by your contribution margin before ads. If you keep ₹25 of every ₹100 sold after product cost, platform margin and other variable costs, you need a ROAS above 4.0 to make any profit from ads. Enter your own numbers below. None of the three platforms publishes a typical ROAS that we could confirm as of November 2026.

What do the defaults mean?

The formula for ROAS comes from Amazon Ads' guide: campaign revenue divided by campaign spend, where 2:1 means ₹2 earned per ₹1 spent. Amazon's page says ROAS and ACOS measure the same results in different formats. It does not discuss break-even ROAS, so that part is simple arithmetic shown below.

The inputs are: ad spend ₹10,000, ad-attributed revenue ₹50,000 (a ROAS of 5, as a placeholder), and a contribution margin before ads of 25%. Contribution margin means the share of selling price left after product cost, the platform's margin or fee, GST-neutral logistics and any trade scheme. We have no confirmed Blinkit, Zepto or Instamart commission rate to default to, so the margin field is yours to set. See quick commerce margin calculator for building that figure.

How is break-even ROAS worked out?

Each ₹1 of ad revenue leaves you a contribution margin before ads, written as m. Break-even happens when the margin earned on that revenue equals the ad spend:

• Break-even ROAS = 1 ÷ m
• ROAS needed for a target profit p (as a share of ad revenue) = 1 ÷ (m − p)
• Profit after ads = ad revenue × m − ad spend

Worked example with the defaults. Margin is 25%, so break-even ROAS is 1 ÷ 0.25 = 4.0. With ₹10,000 spend and ₹50,000 revenue, ROAS is 5.0. Profit is 50,000 × 0.25 − 10,000 = ₹2,500, which is 5% of ad revenue. To keep a 5% profit you need 1 ÷ (0.25 − 0.05) = 5.0, so the defaults sit exactly on the target.

If your margin falls to 15%, break-even ROAS becomes 6.7, and the same campaign loses money. That is why a "good" ROAS means nothing without margin.

Which revenue should you count?

Count only revenue the platform attributes to the campaign, and be strict about what that includes. Dashboards on these platforms can credit sales that happened within an attribution window after an ad view or click. The exact windows for Blinkit, Zepto and Instamart are not confirmed here, so read the definitions in your own ad console. Some of that revenue would have happened anyway, so treat reported ROAS as an upper bound and compare ad-on and ad-off days where you can.

Match the margin to the SKU. A premium pack and a small trial pack have different margins and different break-even ROAS.

Why does ROAS matter more now?

Spend on these platforms is rising. Lapaas Voice reported in June 2026 that Zepto's filing showed ₹1,636 crore of ad revenue in FY26, up 151%. The same piece cites Datum Intelligence putting combined ad revenue across top instant-delivery channels on track for ₹4,900 crore by the end of 2026. The article gives no ROAS or take-rate figures. The networks behind these ads are also growing. Blinkit's page lists 2,700+ stores across 400+ cities, and Zepto's filing reportedly shows 1,139 dark stores as of 31 March 2026, up from 1,029 a year earlier. More stores mean more pincodes to buy, so ROAS can differ sharply between cities. More brands bidding for the same slots usually pushes costs up, so check break-even ROAS every month rather than once.

For platform-specific ad formats, see Blinkit ads guide for brands, Zepto ads guide and the quick commerce ads guide. For how ROAS relates to ACOS and TACoS, read ACOS vs TACoS vs ROAS.

FAQ

What is a good ROAS on Blinkit or Zepto? There is no confirmed platform benchmark. A good ROAS is any figure above your break-even ROAS plus the profit you want. At a 25% margin, break-even is 4.0. At 40% it is 2.5. Work from your margin, not from numbers quoted in agency blogs.

What is break-even ROAS? It is the ROAS at which the margin earned on ad revenue exactly equals the ad spend, so profit from ads is zero. It equals 1 divided by your contribution margin before ads, for example 4.0 at a 25% margin.

Does this calculator work for Instamart too? Yes. It uses only your spend, attributed revenue and margin, so it works on any platform, including Instamart, Amazon, Flipkart or Meesho. Only the margin differs, because each platform charges differently. We have not confirmed platform fee schedules, so enter yours.

How is ROAS different from ACOS? ACOS is ad spend divided by ad revenue, shown as a percentage. ROAS is revenue divided by spend. They carry the same information in different formats. A ROAS of 5 equals an ACOS of 20%.

Should I include GST in revenue or spend? Be consistent. Use amounts excluding GST for both revenue and spend where you can, since GST on sales is collected for the government and GST on ad fees may be claimable as input credit if you are registered. Check with your chartered accountant. This is general information, not tax advice.

Is anything I type saved or sent? No. The calculation runs in your browser, makes no network calls, and nothing you enter is stored or sent to Blooprint. Reloading the page resets the defaults.

What to do next

Work out your margin per SKU first, then set a ROAS target above break-even for each. Blooprint can review your Blinkit, Zepto and Instamart campaigns against that target through quick commerce management.