Marketing Conversion Calculator
Calculate conversion rate, cost per conversion, and marketing ROI from visitors, conversions, campaign cost, and revenue.
Enter visitors, conversions, cost, and revenue to measure conversion rate, cost per conversion, and campaign ROI.
About Marketing Conversion Rate, CPA, and ROI
Online marketing performance usually rests on three linked ratios: how many visitors convert, what each conversion costs, and whether the revenue covers the spend. The marketing conversion calculator divides conversions by visitors for the conversion rate, divides campaign cost by conversions for cost per conversion (CPA), and divides profit on the campaign (revenue minus cost) by cost for ROI. With 15,000 visitors, 450 conversions, $7,500 cost, and $22,500 revenue, conversion rate is 3.00 percent, CPA is $16.67, and ROI is 200.00 percent. Define a conversion the same way in the count and in the revenue. If a conversion is a purchase, revenue should be sales from those purchases, not lifetime value unless you are deliberately using LTV. If a conversion is a lead, revenue should be the value you assign to those leads, and ROI becomes a modeled figure. Visitors should be the same population that could have converted—landing-page sessions, not the entire site—unless that is the funnel you intend to measure. Campaign duration in days is collected for your notes and does not enter conversion rate, CPA, or ROI. Those three metrics are period totals. If you need a daily run-rate, divide conversions or revenue by days yourself. A shorter window with the same totals will look identical here, which is intentional: the ratios are not annualized. A high conversion rate with a high CPA can still lose money if revenue per conversion is thin. A 2 percent conversion rate with $25 CPA and $12,000 revenue on $7,500 cost is a 60 percent ROI, which may be acceptable for a prospecting campaign and poor for retargeting. View-through conversions, branded search, and assisted conversions will not appear unless you put them in the conversion count. Use the marketing conversion calculator to compare creatives, channels, or landing pages on the same definitions. It is not an attribution model, a blended CAC including salaries, or a tax-aware profit measure.
Marketing Conversion Calculator Examples
Conversion rate, CPA, and ROI use visitors, conversions, cost, and revenue. Duration does not change the ratios.
| Input | Output | Notes |
|---|---|---|
| 15,000 visitors; 450 conversions; $7,500 cost; $22,500 revenue | Conversion rate 3.00%; CPA $16.67; ROI 200.00% | Each conversion costs $16.67 and the campaign returns $2 of profit per $1 spent. |
| 10,000 visitors with 450 conversions and the same cost and revenue | Conversion rate 4.50% | The same conversions on fewer visitors raise the rate; CPA and ROI are unchanged. |
| 15,000 visitors; 300 conversions; $7,500 cost; $12,000 revenue | Conversion rate 2.00%; CPA $25.00; ROI 60.00% | Fewer conversions and less revenue weaken all three metrics. |
How to Calculate Marketing Conversion Metrics
- Enter visitors and conversions from the same funnel and period.
- Enter campaign cost and the revenue you attribute to those conversions.
- Select Calculate to read conversion rate, cost per conversion, and ROI.
- Compare channels only when conversion and revenue definitions match.
Marketing Conversion Calculator FAQ
How is conversion rate calculated?
Conversion rate is conversions divided by visitors, times 100. Visitors must be the population that could have converted.
How is cost per conversion calculated?
CPA is total campaign cost divided by conversions. If conversions are zero, CPA is shown as zero rather than dividing by zero.
Does campaign duration affect the results?
No. Days are not used in conversion rate, CPA, or ROI. Those metrics are totals for the period you already summed into visitors, conversions, cost, and revenue.
Is marketing ROI the same as ROAS?
No. ROI here is (revenue − cost) ÷ cost. ROAS is usually revenue ÷ cost and would be 100 percentage points higher than this ROI when cost is positive.
What if cost is zero?
Conversion rate still computes. ROI is shown as zero when cost is not positive, because the return-on-spend identity would divide by zero.