How to think about budget the right way

Let’s say you run a law firm:

• Average client value: $8,000
• You’re willing to spend 10% to acquire a client: $800 max cost per acquisition
• Your landing page converts at 15% (industry average for law)
• That means you can spend up to $120 per lead ($800 × 15%)
• Average CPC for law keywords: $40–$80
• To get 10 leads you need roughly 70 clicks at $60 average = $4,200/month
• 10 leads at 30% close rate = 3 new clients × $8,000 = $24,000 revenue
• $4,200 spent → $24,000 revenue = 5.7x ROAS

This is how profitable Google Ads budgeting works — backwards from client value, not forwards from what feels comfortable.

Your industry’s average cost per click (CPC)

Different industries have wildly different CPCs on Google. A click for “personal injury lawyer” costs $80–$150. A click for “wedding photographer” costs $1–$3. Your budget needs to be large enough to get a meaningful number of clicks in your industry.

If your industry CPC is $50 and your budget is $300/month — you get 6 clicks. That’s not enough data to optimise anything or generate consistent leads. You need at minimum 2–3 clicks per day to gather useful data.

Your target location

CPCs vary dramatically by location. Advertising in New York, London, or Sydney costs significantly more than advertising in smaller cities or towns. A $1,000/month budget goes much further targeting a specific city than it does targeting an entire country.

Rule of thumb: Start with the tightest geographic targeting that still gives you enough audience. A local plumber should target their city — not the whole country.

Your conversion rate

The higher your landing page conversion rate, the less you need to spend to get a lead. If your page converts at 2% you need 50 clicks per lead. If it converts at 10% you need 10 clicks per lead — 5x more efficient with the same budget.

This is why fixing your landing page before increasing your budget is always the right move. A better converting page stretches every dollar further.

Your competition level

Highly competitive industries and locations drive up CPCs because more advertisers are bidding on the same keywords. Check your Search Impression Share in Google Ads — if it’s below 50%, your budget may be too low to compete effectively in your market.

Your business goals

How many new clients do you want per month? Work backwards from that number. If you want 5 new clients, know your close rate (e.g. 25%), which means you need 20 leads. If your cost per lead is $100, you need $2,000/month in ad spend.

Minimum $10–$15 per day to gather meaningful data

Google Ads needs data to optimise. If your daily budget is too low you won’t get enough clicks to make informed decisions or for Google’s algorithm to learn what works.

Our minimum recommendations:

• Low CPC industries (home services, local retail) — minimum $300–$500/month
• Medium CPC industries (real estate, education) — minimum $1,000–$1,500/month
• High CPC industries (legal, medical, finance) — minimum $2,000–$3,000/month

Below these minimums you simply won’t get enough data or clicks to generate consistent leads. You might get occasional enquiries but nothing predictable or scalable.

4 step budget calculation

1. What is a new client worth to you? (lifetime value or average project value)
   Example: $3,000
2. What % of that are you willing to spend to acquire a client?
   Example: 15% = $450 max cost per acquisition
3. What is your landing page conversion rate? (enquiries ÷ visitors)
   Example: 10% conversion rate = $450 × 10% = $45 max cost per lead
4. What is the average CPC in your industry?
   Example: $15 CPC ÷ 10% conversion = $150 cost per lead

If your max CPL ($45) is lower than your calculated CPL ($150) — either your conversion rate needs improving, your CPC is too high, or your client value calculation needs revisiting.

Monthly budget = Target leads per month × Cost per lead
Example: 20 leads × $45 = $900/month budget

Starting with too small a budget and giving up too soon

Google Ads needs at least 30 days and enough clicks to optimise. Businesses that start with $200/month, get no leads in the first two weeks, and give up — never gave it a fair chance. Budget too small = not enough data = poor results = wrong conclusion that “Google Ads doesn’t work.”

Scaling budget before fixing conversion problems

If your campaign is generating clicks but no leads — doubling your budget just doubles your losses. Always fix your landing page, ad relevance, and keyword targeting before increasing spend. More budget amplifies what’s already working — it can’t fix what’s broken.

Spreading budget across too many campaigns

Running 5 campaigns at $100/month each gives each campaign $3.30/day — not enough for any of them to generate data or results. Concentrate your budget on 1–2 campaigns maximum when starting out. Master one campaign, then expand.

Not accounting for Google’s budget pacing

Google can spend up to 2x your daily budget on any given day to capture high-traffic moments — but averages out over the month. So a $1,000/month budget ($33/day) might see $60 spent on one day and $10 on another. This is normal — judge performance monthly, not daily.

Only scale when these 3 conditions are met

1. Your CPL is at or below your target — you know what a lead costs and it’s profitable
2. You have at least 30 conversions in the last 30 days — Google’s AI has enough data to optimise effectively
3. Your conversion tracking is accurate — you know exactly which clicks are generating leads

When all three are true — increase budget by 20–30% at a time. Never double your budget overnight. Sudden large increases can disrupt Google’s algorithm and cause performance to drop temporarily.