How Google Ads budgets work
A Google Ads budget is an average daily amount: on any day the campaign can spend up to twice that average, but over a month it will not be charged more than 30.4 times it. Google’s help page states both limits: a daily spending limit of two times the average daily budget and a monthly spending limit of 30.4 times it, for most campaigns.[1]
| Daily budget | Most in a month | Most in one day | Clicks per month |
|---|---|---|---|
| $10 | $304 | $20 | 152 |
| $25 | $760 | $50 | 380 |
| $50 | $1,520 | $100 | 760 |
| $100 | $3,040 | $200 | 1,520 |
| $250 | $7,600 | $500 | 3,800 |
To set a daily budget from a monthly one, divide by 30.4: a $3,000 month is about $98.68 a day.[1]
From budget to clicks and conversions
Clicks are monthly spend divided by the average CPC, which Google calculates as total cost of clicks divided by clicks.[2] Conversions are clicks × conversion rate, with conversion rate measured as conversions ÷ interactions.[3] Multiply by the value per conversion for revenue; divide by spend for ROAS, the same figure as Google’s “Conv. value / cost”.[4]
- Clicks a month760
- Conversions38
- Cost per conversion$40.00
- ROAS2.5x
Use your own account’s average CPC and conversion rate from the last 30–90 days. For a new account, run a small test first; the ad spend calculator plans the budget backwards from a goal, and the CPA calculator sets a Target CPA[5] from your margin.
Forecasting mistakes
- Treating the daily budget as a hard cap. Spend can reach 2× on high-traffic days; the monthly limit is what protects you.
- Using Keyword Planner bids as CPC. Suggested bid ranges are estimates of top-of-page bids, not what you will pay on average.
- Spreading a small budget over many campaigns. A $10-a-day campaign at a $5 CPC gets about two clicks a day, too few to learn from. Concentrate budget, then compare results with the ROAS calculator.
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Frequently asked questions
How much will Google Ads spend per month?
At most 30.4 × your average daily budget. $50 a day can be charged up to $1,520 in a month.
Can Google Ads spend more than my daily budget?
Yes, up to twice the average daily budget on a single day, balanced out over the month.
How many clicks will I get on Google Ads?
Monthly spend ÷ average CPC. $1,520 at $2.00 a click is about 760 clicks.
How do I calculate a Google Ads daily budget?
Divide the monthly budget by 30.4. $3,000 ÷ 30.4 ≈ $98.68 a day.