If you’ve ever opened Google Ads, typed in a number, and immediately wondered whether you just made a smart investment or set fire to your money — you’re not alone. “How much should I spend?” is the single most common question small business owners ask before running ads.
The honest answer is: it depends. But “it depends” is useless on its own, so let’s turn it into something you can actually act on.
Start With a Goal, Not a Number
Most people pick a budget first and hope for results. That’s backwards. Your budget should be reverse-engineered from what you want to achieve.
Ask yourself three questions:
1. How many new customers do I want per month?
2. What is one customer worth to me (over their lifetime, not just the first sale)?
3. What percentage of leads do I typically close?
Once you know those, you can work out a budget that makes sense instead of guessing.
A Simple Way to Estimate Your Budget
Here’s a back-of-the-napkin method:
• Say you want 10 new customers a month.
• You close about *1 in 4 leads, so you need *40 leads.
• In your industry, a lead costs roughly $15 through Google Ads.
• 40 leads × $15 = $600/month as a starting point.
These numbers will be different for your business, but the framework holds: customers needed → leads needed → cost per lead → budget. Cost per lead varies a lot by industry — a local plumber and a B2B software company live in completely different worlds.
Realistic Starting Budgets by Business Stage
• Just testing the waters: $500–$1,000/month. Enough to gather real data and learn what works without overcommitting.
• Established and ready to scale: $2,000–$5,000/month. You have proof the channel works and want consistent lead flow.
• Aggressive growth: $5,000+/month. You know your numbers cold and every extra dollar reliably returns more than it costs.
If your budget is under $500/month, Google Ads can still work — but you’ll want to focus tightly on one location, one service, and high-intent keywords rather than spreading thin.
Where Small Budgets Get Wasted
A small budget isn’t a problem. A small budget spent badly is. The most common money-leaks I see:
• Targeting too broad. Bidding on generic keywords burns cash fast. “Marketing agency” is expensive and vague; “Google Ads management for dentists” is cheaper and converts.
• Sending clicks to a weak landing page. If your page doesn’t clearly ask the visitor to do one thing, you’re paying for traffic that bounces.
• No negative keywords. Without them, you pay for searches that will never become customers.
• Set and forget. Ads need regular attention in the first few weeks. The accounts that win are the ones that get optimized.
The Bottom Line
There’s no universal “right” number — but there is a right process. Start from your goals, estimate backwards, begin with an amount you can sustain for at least three months, and treat the first month as paid learning rather than instant profit.
If you’d rather not guess your way through it, that’s exactly the kind of thing I help businesses with — building campaigns that lower cost per lead and actually return more than they cost.
Want a budget tailored to your business? Let’s talk.