Brand BanaoThe honest answer is not a universal rupee amount. A sensible advertising budget depends on what a sale is worth, how reliably the website converts, how quickly customers repurchase, and how much data the campaign needs before you can judge it.
Starting with “What can I afford per month?” is necessary, but incomplete. Start with unit economics, then define a test that your business can survive even if it fails.
Begin with allowable customer acquisition cost
Your customer acquisition cost, or CAC, is the amount spent to acquire a new customer. The maximum affordable CAC is not the selling price. It must leave room for product cost, shipping, payment fees, returns, discounts, taxes, service costs, and the profit the business needs.
For example, a ₹2,000 order with ₹700 of contribution before advertising cannot safely support a ₹900 acquisition cost unless repeat purchases reliably recover the difference. If repeat purchases are common, use a conservative customer lifetime value rather than assuming every new buyer will become loyal.
Work backwards from a test
- Define one primary outcome, such as a completed purchase or qualified lead.
- Estimate a break-even or target CAC using contribution margin.
- Choose how many outcomes would provide a useful first signal. A test designed for only one conversion is fragile.
- Multiply the target CAC by the desired number of outcomes to estimate media spend.
- Add management and creative costs separately so ad spend is never confused with the total marketing cost.
Use a budget the platform can actually learn from
Automated bidding needs conversion signals. Google’s guidance ties campaign setup to a chosen conversion goal and distinguishes between maximizing conversion volume and conversion value. If the budget is spread across too many campaigns, audiences, or products, each part may receive too little data to learn anything useful.
Concentration is usually better at the beginning: one strong offer, one primary goal, a few meaningfully different creatives, and a defined geography. Expansion should follow evidence, not precede it.
Separate the test budget from the scaling budget
A test budget buys information. Its job is to reveal whether the offer, creative, landing page, audience, and measurement system can work together. A scaling budget buys more of a result that has already shown some repeatability.
Do not scale because one day looked excellent. Look for enough conversion volume, stable tracking, acceptable economics, and evidence that fulfilment can handle demand. Increase budgets in controlled steps and watch whether marginal returns deteriorate.
Three budget mistakes to avoid
- Dividing a modest budget across every platform before one channel works.
- Judging performance from clicks or reach when the business needs purchases or qualified leads.
- Changing budgets, audiences, and creative every day, making it impossible to identify what caused the result.