Google Ads budget calculation: From target inquiries to monthly and daily advertising budgets

How is a monthly budget converted to a daily budget?

Dividing the monthly figure produced by Google Ads budget calculation by 30.4 gives the average daily budget. In Google Ads, budgets are entered as an average daily amount per campaign rather than a monthly amount; Google’s daily budget setup instructions also ask those working with monthly budgets to divide that number by 30.4. The average daily budgets page explains that 30.4 is the average number of days in a month, obtained by dividing 365 by 12.

According to the same page, Google increases spending on days with a higher likelihood of clicks or conversions; some days are below the average and some above it. For most campaigns, spending on a single day does not exceed twice the average, and the monthly total does not exceed 30.4 times that average. The daily figure in the calculator therefore means ‘this much on average throughout the month,’ rather than ‘exactly this much every day.’

The conversion method is the same for campaigns using ad scheduling. According to the Google Ads Help Center, these campaigns work toward a monthly target of 30.4 times the average daily budget, regardless of how many days they are active during the month. For multiple campaigns, the monthly budget is first distributed between campaigns, then each share is divided by 30.4.

Reverse calculation: How many clicks and inquiries can the available budget produce?

If the budget is known beforehand, the tool works in reverse mode: dividing the monthly amount by average CPC gives estimated clicks, and multiplying clicks by the conversion rate gives estimated inquiries. With the same example values, 6,000 TL ÷ 10 TL = 600 clicks, and 600 × 5% = 30 inquiries. In reverse mode, clicks and inquiries are rounded down; an inquiry the budget cannot support does not appear in the result.

This mode shows two things. First, whether the amount is sufficient for the target: if the result falls below the target, the budget, CPC or rate must change. Second, the effect of an improvement in the rate: with other values held constant, increasing the rate from 5% to 6% means 36 inquiries from the same 600 clicks. Some work affecting the rate takes place on the landing page rather than in the advertisement; page speed, form layout and making the offer understandable on the first screen are covered on the landing page design page.

Why is the calculated budget not a definite result?

The calculated budget is not a definite result because it relies on three assumptions, each of which changes in a live campaign. Google emphasizes that Keyword Planner provides traffic forecasts, but campaign performance depends on factors such as bids, budgets, ad quality, location targeting, products and customer behavior. CPC is determined again in every auction; according to Google, Ad Rank thresholds and the associated actual CPC are generally higher for advertisements shown above search results.

If a Smart Bidding strategy will be used, the initial period is also included in the plan. Google’s conversion measurement page states that these strategies require a standard learning phase of 7 to 14 days to gather sufficient data and recommends avoiding frequent manual changes to budgets, CPA or ROAS targets, or conversion goals during this period. After the first month, the Google Ads budget calculation steps are repeated using actual CPC and the actual conversion rate. For live campaigns, Google’s Performance Planner shows the possible effects of setting changes on spending and performance.

How are the advertising budget, management fee and surcharges separated?

The amount calculated by the tool is only the advertising spend going to Google. The total monthly cost consists of three separate items:

• Advertising budget: Transferred directly to Google through the payment settings in the business’s own Ads account; it does not pass through Onur Freelance.
• Management fee: Onur Freelance’s Google Ads management fee starts at 9,000 TL per month; the exact amount is specified in the proposal after reviewing the number of campaigns, campaign types and scope.
• Google surcharge: Google’s help page on surcharges states that a charge called Turkey Regulatory Operating Costs is added on top of advertising costs for advertisements shown in Turkey; the rate applied since January 1, 2026 is 4.5%.

SEO is a separate service; its fee also starts at 9,000 TL per month. When both services are planned together, their fees are calculated separately. Factors affecting the management fee and criteria for comparing proposals are explained on the Google Ads prices page, while the scope of the service is described on the Google advertising management page.

What mistakes are made when planning an advertising budget?

The mistake that most disrupts a plan is applying another business’s conversion rate, or one from a general report, to your own account. The rate is a product of the offer, price and landing page, and the calculator’s result is only as reliable as the rate entered.

Confusing maximum CPC with average CPC: According to Google, maximum CPC is the highest amount an advertiser is willing to pay for a click, and the amount actually paid is often lower. The budget calculation uses the planner’s estimated average CPC rather than the bid ceiling.

Launching a campaign without setting up measurement: Without conversion measurement, the actual rate is unknown at the end of the first month and the calculation cannot be updated. Form submissions, calls and WhatsApp clicks should be measurable before the campaign starts.

Leaving the website out of the calculation: If the page loads slowly or the form does not work, the budget is spent on clicks without generating inquiries. For regular checks, the website management page can be reviewed.

Failing to monitor account status: If advertisements are not running, no budget plan will work. The steps to follow when an account is suspended are described in the Google Ads account suspended article.