Short answer: most small businesses need a minimum of ₹25,000–₹40,000 per month (roughly $300–$500) to gather enough data for Google Ads to work. Below that, you usually get too few clicks to learn anything, and the campaign stalls before it optimises. But “minimum viable” and “correct for your business” are two different numbers — and the correct one is a calculation, not a guess.
Recognised, Certified & Trusted
Here is how to work it out — the same calculation we run before quoting any client at WebAdis.
The only budget formula you need
Ignore what competitors spend. Your budget is a function of what a customer is worth to you and how efficiently you convert traffic.
Monthly budget = (Leads you want) ÷ (Landing page conversion rate) × (Average cost per click)
Work it backwards from revenue:
- What is a customer worth? Take your average order value and multiply by repeat purchases. A dentist at ₹8,000 per treatment with two visits a year is looking at ₹16,000, not ₹8,000.
- What can you afford to pay for one? If your margin is 40% and you want to keep half of it, you can spend about 20% of customer value on acquisition. On ₹16,000 that is ₹3,200 per acquired customer.
- How many leads convert into customers? If one in four enquiries becomes a customer, your maximum cost per lead is ₹800.
- How many clicks make a lead? A decent landing page converts 3–5% of clicks. At 4%, you need 25 clicks per lead.
- What does a click cost? If your average CPC is ₹30, one lead costs ₹750 — just inside your ₹800 ceiling.
Now decide volume. Want 20 new enquiries a month? 20 × 25 clicks × ₹30 = ₹15,000 per month in ad spend.
That is the whole model. Every other article on this topic is a longer way of saying the same thing.
A worked example
A Kolkata interior design studio wants six project enquiries a month.
| Input | Value |
| Average project value | 1,80,000 |
| Gross margin | 35% |
| Acceptable acquisition cost (15% of value) | ₹27,000 |
| Enquiry-to-client rate | 1 in 8 |
| Maximum cost per enquiry | ₹3,375 |
| Landing page conversion rate | 5% |
| Clicks needed per enquiry | 20 |
| Average CPC | ₹55 |
| Actual cost per enquiry | ₹1,100 |
| Budget for 6 enquiries | ₹6,600/month |
The interesting part is the gap. Their maximum tolerable cost per enquiry is ₹3,375 but the market only charges ₹1,100. That gap is headroom — they should be spending far more than ₹6,600 and taking every enquiry the market will give them. Most small businesses discover they are underspending on their best campaign, not overspending overall.
Typical spend by industry
Use these as a sanity check on your own numbers, not as a target. Costs vary enormously by city, season, and how competitive your keywords are.
| Industry | Typical CPC range (India) | Common starting budget/month |
| Home services (plumbing, AC, pest control) | Low–medium | ₹20,000–₹50,000 |
| Dental and elective healthcare | Medium | ₹30,000–₹75,000 |
| Legal and professional services | High | ₹50,000–₹1,50,000 |
| Real estate | High | ₹75,000–₹3,00,000 |
| Ecommerce (general retail) | Low | ₹25,000–₹1,00,000 |
| B2B / SaaS | Very high | ₹1,00,000+ |
| Education and coaching | Medium | ₹40,000–₹1,00,000 |
| Local restaurants and cafés | Very low | ₹10,000–₹25,000 |
Two patterns hold almost everywhere: high-value, low-volume services (legal, real estate, B2B) have expensive clicks and need larger budgets to gather data, while high-volume, low-value businesses can start small because they accumulate conversions quickly.
What actually changes your number
Geography. A campaign targeting Kolkata alone costs a fraction of one targeting all of India. National campaigns need roughly the budget of the largest city you are targeting, multiplied by the number of markets you genuinely want presence in.
Competition. If three well-funded competitors are bidding on your head terms, you either pay their price or go around them via long-tail keywords, which are cheaper but slower to accumulate volume.
Seasonality. Tax consultants, wedding vendors, and school admissions have seasons. Averaging spend across twelve months in these categories is a mistake — front-load the season and reduce off-season spend to a maintenance level.
Campaign type. Search campaigns can run on smaller budgets because intent is high. Performance Max needs materially more spend before its machine learning stabilises — starting it on a small budget is one of the most common ways money gets wasted.
Conversion tracking. This one is invisible but decisive. Without accurate conversion tracking, Google’s bidding is optimising towards nothing useful and your effective budget is halved regardless of what you set.
Five budget mistakes that waste money
1. Spreading a small budget across many campaigns. ₹20,000 split across six campaigns gives each one too little data to optimise. One campaign at ₹20,000 will outperform six at ₹3,300 every time. Consolidate first, expand later.
2. Pausing too early. Google Ads typically needs 4–8 weeks and a meaningful number of conversions before performance settles. Judging a campaign after ten days is judging noise.
3. Setting daily budgets that starve top performers. If one ad group is producing leads below target cost, capping it is choosing to make less money. Move budget towards what works instead of protecting the total.
4. No negative keywords. New accounts routinely leak 20–40% of spend on irrelevant searches in the first month. A weekly search terms review in the first six weeks recovers more money than almost any bid adjustment.
5. Sending traffic to the homepage. A homepage answers ten questions. A landing page answers one. The same budget on a dedicated landing page commonly converts at two to three times the rate — which halves your effective cost per lead without spending a rupee more.
Should you hire an agency or run it yourself?
Honest answer: it depends on your budget and your time.
Run it yourself if your monthly spend is under about ₹25,000, your business is simple (one location, one service), and you can give it a few hours a week. At that spend, an agency fee would be a large share of your total investment, and the campaign is simple enough to manage.
Hire help if your spend is above ₹50,000, you are in a competitive category, you have multiple locations or services, or you have tried it yourself and the numbers did not work. At that level, a 10–15% improvement in efficiency more than covers a management fee — and the setup errors that cost the most money are the ones beginners cannot see. If you want a second opinion on an existing account before committing to anything, our Google Ads management service starts with a free account audit.
Either way, insist on these things: you own the Google Ads account, you own the conversion tracking, and you get monthly reporting that shows cost per lead — not impressions and clicks.
Frequently asked questions
What is the absolute minimum Google Ads budget? Technically there is no minimum. Practically, below about ₹15,000 a month most campaigns generate too few clicks to optimise, and you are paying for learning without ever finishing the learning.
Does Google charge a fee on top of ad spend? No. You pay only for clicks. Agencies charge a separate management fee, usually a percentage of spend or a fixed monthly retainer.
How long before Google Ads is profitable? Expect 4–8 weeks to reach stable performance and roughly three months before you can judge return honestly. Campaigns that are profitable in week one are usually either lucky or reporting the wrong number.
Is Google Ads or Meta Ads better for a small budget? Different jobs. Google captures people already searching for what you sell — better for services with clear intent. Meta Ads create demand — better for visual, impulse, or discovery-led products. If someone is actively searching for you, start with Google.
Should I increase my budget if a campaign is working? Yes, but gradually. Raising budgets more than about 20–30% at once can push a campaign back into a learning phase. Step it up weekly and watch cost per lead.
Work out your own number
The formula above is the whole method — plug in your customer value, close rate, and conversion rate and you have your answer in five minutes.
If you would rather have someone check the working, we run a free audit of your existing account and tell you where the current spend is leaking. See our Google Ads service, or get in touch.
What Our Clients Say
