liminfoAd Budget Calculator
Free web tool: Ad Budget Calculator
Est. Clicks
2,000
Est. Conversions
40
Est. Revenue
2,000,000$
CPA
25,000$
ROAS
200%
Glossary
CPC (Cost Per Click): Cost per click = Total ad spend / Total clicks
CPA (Cost Per Acquisition): Cost per conversion = Total ad spend / Conversions
ROAS (Return On Ad Spend): Ad return rate = Revenue / Ad spend x 100
ROI (Return On Investment): Investment return = (Revenue - Ad spend) / Ad spend x 100
About Ad Budget Calculator
The Ad Budget Calculator is a free, browser-based tool designed for digital marketers, media buyers, and performance marketing teams who need to quickly model campaign economics. It covers four key calculations in one interface: a budget simulator that projects clicks, conversions, revenue, CPA, and ROAS from a given ad spend; a CPC calculator; a CPA calculator; and a ROAS/ROI calculator.
The budget simulator tab takes your ad budget, expected cost-per-click, conversion rate, and average order value, then computes estimated clicks, conversions, and expected revenue. This lets you validate whether a campaign budget makes sense before committing spend. The ROAS tab additionally computes ROI and net profit, showing whether the campaign is profitable or loss-making at a glance.
All four modes use standard digital advertising formulas. CPC = total spend / total clicks. CPA = total spend / conversions. ROAS = revenue / ad spend (expressed as a percentage). ROI = (revenue - spend) / spend * 100. These metrics are universally used across Google Ads, Meta Ads, and any other paid acquisition channel, making this tool useful regardless of the platform you advertise on.
Key Features
- Budget simulator: projects clicks, conversions, revenue, CPA, and ROAS from ad spend + CPC
- CPC calculator: computes cost per click from total spend and click count
- CPA calculator: computes cost per acquisition from total spend and conversion count
- ROAS calculator: computes return on ad spend plus ROI percentage and net profit
- Tab-based UI allows switching between all four calculation modes instantly
- Handles large currency values (Korean Won and USD) with comma formatting
- Real-time calculation as inputs change — no submit button needed
- 100% client-side processing with no data sent to any server
Frequently Asked Questions
What is ROAS and how is it calculated?
ROAS (Return On Ad Spend) measures how much revenue you earn for every unit of currency spent on ads. The formula is: ROAS = Revenue / Ad Spend * 100. A ROAS of 400% means you earn $4 for every $1 spent. It differs from ROI in that it does not subtract the cost of goods sold.
What is the difference between CPA and CPC?
CPC (Cost Per Click) measures what you pay each time someone clicks your ad: CPC = Total Spend / Total Clicks. CPA (Cost Per Acquisition) measures what you pay each time someone completes a desired action (purchase, signup, etc.): CPA = Total Spend / Conversions. CPA is always higher than CPC because not every click converts.
How do I use the budget simulator?
Enter your total ad budget, expected CPC, conversion rate (the percentage of clicks that become customers), and average order value. The simulator will compute estimated clicks (budget / CPC), conversions (clicks * conversion rate), expected revenue (conversions * AOV), CPA (budget / conversions), and ROAS (revenue / budget * 100).
What ROAS should I target for a profitable campaign?
A ROAS above 100% means you are earning more than you spend on ads. However, profitability also depends on your cost of goods sold (COGS) and operating costs. A common rule of thumb is to target a ROAS of 200-400% (2x-4x return) to cover COGS and still earn profit, but the exact threshold varies by business model and margin.
What is a good CPA for digital advertising?
A good CPA depends entirely on your average order value (AOV) and gross margin. A CPA should be significantly lower than your AOV. For subscription businesses, CPA is compared against LTV (lifetime value). As a starting point, many marketers target a CPA that is less than 30% of AOV, but this varies by industry.
How is ROI different from ROAS?
ROAS = Revenue / Ad Spend. ROI = (Revenue - Ad Spend) / Ad Spend * 100. ROI subtracts the investment (ad spend) from the return before dividing, so it measures net profit as a percentage of the investment. A ROAS of 200% corresponds to an ROI of 100%, meaning you doubled your money.
Can I use this for Google Ads, Meta Ads, and other platforms?
Yes. The formulas used (CPC, CPA, ROAS, ROI) are platform-agnostic and apply to Google Ads, Meta Ads (Facebook/Instagram), TikTok Ads, Naver Ads, Kakao Ads, and any other paid channel. Just enter the actual spend and performance numbers from your chosen platform.
Why does the ROAS display as a percentage?
This tool expresses ROAS as a percentage (e.g., 400%) rather than a ratio (e.g., 4x) to make it directly comparable to ROI, which is also a percentage. Some platforms display ROAS as a multiplier (4x), so remember to convert: a ROAS percentage of 400% equals a ROAS ratio of 4.