Google Ads Budget Planner

Google Ads has no minimum spend: you decide what you are willing to pay and you are charged for the clicks you get. The right question is not “how much should I spend?” but “how much do I need to spend to hit my sales goal, and does that goal pay off?”

A budget picked out of thin air, such as “$1,000 a month,” ignores three things: what a click costs, the share of clicks that end in a sale, and what a sale is worth. The right budget follows from those three numbers, and they are the numbers of your store, not anyone else's.

Where to read your numbers. Average CPC, CTR and conversion rate are in the campaigns table of Google Ads, over a period long enough to smooth out day-to-day swings. Average order value is in your store admin or in Google Analytics. If you have not run any campaign yet, no borrowed figure is reliable: start with a small test budget to measure your own rates, then come back here.

A budget is not an envelope, it is the price of a sales goal. If that price is higher than what those sales earn, the budget is not what needs fixing: the goal, the margin or the rates are.

The planner also estimates the impressions needed: clicks ÷ CTR. Use it as a plausibility check, because a budget is only spent if your ads are shown often enough.

The budget depends as much on conversion rate as on CPC. For the same sales goal, doubling the conversion rate halves the budget. That is why improving a product page often costs less than stretching the ad budget.

The first two examples share the same goal and the same CPC: only the conversion rate changes, and the budget doubles, flipping profit into loss. In the third, each sale earns $13.50 of margin (30% of $45) for $32 of advertising: no budget fixes that. CPC, conversion rate, price or margin has to change.

1. 1

   Pick your currency

   Dollar, euro or pound: the maths is identical, only the display changes.

2. 2

   Set the sales goal

   The number of orders advertising must bring in each month, not your total orders from every source.

3. 3

   Enter CPC, conversion rate and CTR

   Read them in your Google Ads reports. Conversion rate is measured per click: use the Conv. rate column, not an analytics rate calculated per session.

4. 4

   Enter the average order value

   The average value of an order, as Google Ads reports it as conversion value.

5. 5

   Add your margin before ad spend

   Optional, but essential to know whether the budget pays off. Work it out with the profit margin calculator.

Google Ads is set up with an average daily budget. According to Google's documentation, on any given day spend can reach up to twice that daily budget, so you can benefit from days when demand is high. In return, over a month you are never charged more than your daily budget multiplied by 30.4. The planner therefore divides the monthly budget by 30.4 to give you the daily budget to enter.

A budget does not guarantee spend. If your bids are too low or your audience too narrow, Google spends less than the budget you set.

The learning phase. When a campaign launches, and after a significant change to bid strategy, target ROAS or budget, Google relearns how to serve your ads and results are unstable. Two practical consequences: do not judge a campaign on its first days, and avoid changing the target or the budget every other day, since each change restarts learning.

A sanity check. Divide the daily budget by the CPC: that is how many clicks you buy per day. $82.24 ÷ $0.50 is about 164 clicks a day, or about 3 sales at a 2% conversion rate. A budget that buys only a few clicks a day leaves the algorithm without data: group your products into fewer campaigns rather than spreading thin.

CPC and conversion rate are not the same from one campaign type to another. Do not mix their figures: calculate a budget for each type with its own rates, then add them up.

There is no standard percentage split: it depends on your results. Fund what is measured as profitable first, start with a single campaign type, and add another with its own budget rather than diluting the first.

• Starting from a target CPA — A CPA is not a budget: it is the result of a CPC and a conversion rate. An unrealistic target CPA gives a budget that does not produce the sales you expect.
• Mixing two conversion rates — Google Ads measures the rate per click, Google Analytics per session. They do not share a base: use the Google Ads one for this calculation.
• Forgetting tax and returns — A tax-inclusive order value inflates real revenue, and a return is a sale whose advertising is still owed. Take both out of your margin before ad spend.
• Freezing a CPC all year — Bids rise during peak periods (sales, holidays). Recalculate the budget before each one.

Once the budget is set, check what it returns with the Google Ads cost calculator, which starts from the budget and gives clicks, sales, ROAS and profit.

A carefully calculated budget is worthless if your products stop showing. A Google Merchant Center suspension shuts down Shopping and Performance Max ads, which rely on your feed: the budget stops serving and the sales the planner expects disappear. The causes often have nothing to do with advertising: incomplete business details, a vague return policy, prices that differ between site and feed, unproven claims on product pages.

GClimb reviews your store the way a Google reviewer would and lists the compliance issues to fix. Run the free store audit, or start with the Google Merchant Center compliance checklist.