Conversion Rate Calculator (Free + Confidence Interval Included)
Turn raw visitors and conversions into a precise conversion rate with margin of error — in seconds.
Enter your numbers
Industry benchmarks
| E-commerce homepage | 1 – 3% |
| Product detail page | 2 – 5% |
| Pricing page (SaaS) | 3 – 7% |
| Lead gen landing page | 5 – 15% |
| Free trial signup | 8 – 20% |
| Blog (email capture) | 0.5 – 2% |
Results
Conversion rate
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95% CI lower
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95% CI upper
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Margin of error
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Non-converting
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Embed with current values
How to calculate your conversion rate
Four steps to get a number you can trust and act on.
Pick a time range
Choose a consistent date range in your analytics — ideally 30 days or a full business cycle to avoid day-of-week bias.
Get total visitors
Pull sessions or unique visitors for the page or flow you're measuring. Don't mix sessions with pageviews.
Get total conversions
Count goal completions for that same period — purchases, signups, form submits, CTA clicks — whatever your conversion event is.
Read the confidence interval
The 95% CI shows the range your true rate likely falls in. Narrow CI = reliable number. Wide CI = you need more data.
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Frequently asked questions
What is a good conversion rate?
It depends heavily on the page type and industry. E-commerce product pages typically convert at 2–5%, while SaaS free-trial pages can reach 8–20%. The most useful benchmark is your own historical data — the goal is to beat your baseline, not an industry average.
What is a confidence interval for a conversion rate?
A 95% CI tells you the range where your true conversion rate likely falls, given your sample. For example, 200 conversions from 5,000 visitors gives a 4.0% rate with a 95% CI of roughly ±0.5%. Larger samples = narrower intervals = more precision.
Why use the Wilson score interval?
The Wilson score interval is more accurate than the simple ±z×SE formula, especially for small samples or extreme conversion rates (near 0% or 100%). It's the same method used by most statistical software and is the recommended approach for conversion rate confidence intervals.
How do I improve my conversion rate?
The most reliable method is systematic A/B testing — changing one element at a time and measuring impact. High-ROI starting points: CTA button copy and colour, headline, social proof placement, pricing presentation, and form field reduction.
Stop guessing.
Start testing.
Your first experiment — A/B test, popup, form, or heatmap — can be live in under 2 minutes. No developers, no contracts, no risk.