🎯 Conversion Rate Calculator

The Conversion Rate Calculator turns visitors and conversions into a conversion-rate percentage, and — if you add spend — the cost per conversion. Conversion rate is the single most important efficiency metric for most websites, because small improvements to it multiply the value of every other marketing effort.

How to Use This Tool

Enter the number of visitors (or sessions) and the number of conversions. Optionally add total spend to also see cost per conversion. The results appear instantly.

What This Tool Checks

Conversion rate = conversions ÷ visitors × 100; cost per conversion = spend ÷ conversions. Exact arithmetic.

Understanding Your Results

Conversion rate tells you what share of visitors take the action you want. Cost per conversion tells you what each of those actions costs. Read them together: a low conversion rate with a high cost per conversion is the clearest signal that something needs fixing.

How to Fix Common Problems

If the rate seems implausibly high, check you are not counting the same person's multiple conversions against unique visitors. Decide whether "visitors" means sessions or unique users and stay consistent across comparisons.

SEO Best Practices

Compare conversion rates for the same traffic source and the same goal — homepage-to-signup is not comparable to checkout completion. Test one change at a time so you can attribute any improvement, and gather enough data before drawing conclusions from small samples.

Example

150 conversions from 5,000 visitors is a 3% conversion rate. With $1,200 of spend, that is $8 per conversion.

Common Mistakes to Avoid

Comparing conversion rates across different goals or funnel stages as if they were equivalent. Reading too much into tiny sample sizes where a couple of conversions swing the percentage wildly.