“How much budget do I need for Google Ads?” is the wrong first question. The right one is: “What can an enquiry or a customer cost me?” That number gives you the budget – not the other way around. This guide shows how to calculate your budget instead of guessing, how much you need to start, and how to scale sensibly.
In brief
- Derive the budget from customer value and close rate, not gut feeling.
- The measure is cost per customer, not the daily budget amount.
- There is a minimum budget: too little means too little data to learn.
- Scale what is profitable – raise budget where cost per customer holds up.
- Budget without measurement is a guess – tracking comes first.
From customer value to budget
Work backwards. Example: a customer is worth €1,000 to you. Of ten enquiries you win two (20% close). If you can spend, say, €150 per customer on advertising, that allows a maximum of €30 per enquiry (€150 / 5 enquiries per customer). If one enquiry takes 5 clicks on average, your maximum click price is €6. That turns clear numbers into a solid budget – rather than a guessed monthly figure.
The minimum budget
Budgets that are too small fail not on principle but on data: the automation needs enough conversions per week to learn. As a rule of thumb, the budget should be enough to produce several conversions per week. Where the price per enquiry is high (e.g. legal or construction), the minimum budget is higher too. Better to run one area or service cleanly with enough budget than everything with too little.
Scale correctly
Scaling does not mean blindly doubling the budget. Raise it step by step where cost per customer holds up, and watch whether it stays stable as you increase. Often efficiency drops beyond a point, because extra clicks come from less relevant searches. Then expand to new services, areas or channels rather than overloading a saturated segment.
Common budget mistakes
- Guessing the budget instead of deriving it from customer value.
- Too many campaigns each with too little budget – nothing learns.
- Measuring success by daily budget or click price instead of cost per customer.
- Switching off when busy and restarting in a lull, instead of throttling.
- Scaling without watching efficiency – more budget, worse enquiries.
Frequently asked questions
How much budget do I need for Google Ads?
Enough to gather sufficient conversions per week and cover your allowed price per enquiry. Derive it from customer value and close rate.
Is there a minimum budget?
Effectively yes. Too little budget gives too little data for the automation to learn. Better to start focused with enough budget.
How do I measure whether the budget is right?
By cost per won customer relative to customer value – not by click price or daily budget.
How do I scale correctly?
Raise budget step by step where cost per customer holds up, and expand to new services/areas rather than overloading a saturated segment.
What is the most common budget mistake?
Guessing the budget and spreading it across too many campaigns, so none gets enough data to learn.
Do I need tracking to steer the budget?
Absolutely. Without conversion tracking, every budget decision is a guess.
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