Don’t start with a number — start with a calculation. Your minimum useful PPC budget is roughly the cost per click in your market × the number of clicks you need to get a statistically useful number of leads. For most small businesses that means enough budget for at least 300–500 clicks a month per campaign, plus management fees. Anything less usually produces too little data to optimise.
Key takeaways
- Work backwards: leads needed ÷ conversion rate × cost per click = ad spend.
- Check cost per customer against your margin and customer lifetime value.
- Budget for management, landing pages and tracking, not just clicks.
- Use the first 90 days to learn, cut waste and then scale.
Step 1: Work backwards from leads
- Estimate your cost per click (CPC). Google Ads Keyword Planner shows typical bid ranges for your keywords and location.
- Estimate your conversion rate. A focused landing page often converts 3–10% of ad clicks into enquiries; a generic homepage much less.
- Decide how many leads you need. Work from your sales close rate. If you close 1 in 5 enquiries and want 10 new customers, you need about 50 leads.
- Calculate: leads needed ÷ conversion rate = clicks needed. Clicks × CPC = monthly ad spend.
Example: 50 leads ÷ 5% conversion = 1,000 clicks. At an average CPC of Rs 60, that is about Rs 60,000 in ad spend for the month. Use your own CPC data — these figures are only to show the method.
Step 2: Check it against your margins
Divide your spend by the number of customers you expect. That is your cost per acquisition. If it is higher than the profit from a customer’s first purchase, PPC only works when customers buy again (repeat purchases, subscriptions, ongoing services). Know your customer lifetime value before deciding a budget is “too expensive”.
Step 3: Add the costs people forget
- Management: an agency or in-house specialist to build, monitor and optimise campaigns
- Landing pages: pages built for each ad group convert far better than a homepage
- Conversion tracking: Google Tag Manager, GA4 and call/WhatsApp tracking set up correctly
- Creative: images and video for Display, YouTube and Meta campaigns
- Taxes and payment charges: check what applies to ad payments for your business
How to spend the first 90 days
- Month 1 – learn: start with exact and phrase match keywords, tight locations and a daily budget you can sustain. Add negative keywords every few days.
- Month 2 – cut: pause keywords and ads with spend but no conversions. Shift budget to what converts.
- Month 3 – scale: raise budget on campaigns with a cost per lead below your target; test new keywords and audiences.
Signs your budget is wrong
- Too low: campaigns stop by midday, too few conversions to make decisions, “limited by budget” warnings on your best campaigns.
- Too high too early: spend climbing on broad keywords with poor search terms, before you know what converts.
Google Ads vs Meta Ads budget
Google Search captures people already looking for your service, so cost per lead is often higher but intent is strong. Meta (Facebook and Instagram) creates demand among people who weren’t searching; clicks are cheaper but leads need more qualification. Many businesses start with Google Search for high-intent leads and add Meta for awareness and remarketing.
Want a budget estimate based on your actual keywords? Our PPC team can pull CPC data for your market and model expected leads before you spend.
Frequently asked questions
Is there a minimum budget for Google Ads?
Google has no fixed minimum, but a budget too small to buy a few hundred clicks a month rarely produces enough data to improve results.
Should I spend the same every month?
Adjust for seasonality. Increase spend in your peak months and when campaigns are proven profitable; reduce it in slow periods.
How long before I know if PPC works for my business?
With proper tracking, 60–90 days is usually enough to see whether you can reach a profitable cost per lead.
Sources and further reading
- Google Ads Help: Use Keyword Planner
- Google Search Central: Creating helpful, reliable, people-first content
