How to use the Conversion Rate Calculator
- 1. Choose a modeConversion rate, visitors needed, or compare two versions.
- 2. Enter your numbersVisitors and conversions, or a goal and expected rate.
- 3. Read the resultSee the rate, the traffic you need, or the lift and significance.
Worked examples
A landing page with 132 sign-ups from 4,800 visitors converts at 132 ÷ 4,800 = 2.75%, or one sign-up for every 36.4 visitors. Add a value per conversion, such as ₹500, and the tool shows value per visitor too, which tells you the most you can pay per click and still break even.
In A/B mode the default compares version A (132 of 4,800, 2.75%) with version B (175 of 5,000, 3.5%). That is a 27.3% lift. A two-proportion z-test gives z of about 2.13 and p of about 0.033, so the difference is significant at the 95% level. To plan ahead, Visitors needed shows that 100 conversions at a 2.5% rate need 4,000 visitors.
Testing without fooling yourself
- Decide the sample size and test length before you start, and run full weeks to cover weekday patterns.
- Do not stop the moment p drops below 0.05. Peeking repeatedly makes false wins likely.
- Change one main thing per test so you know what caused the difference.
- A significant result says the difference is probably real; the lift estimate itself is still uncertain.
The p-value uses a normal approximation, which works well when each version has at least a few dozen conversions; for very small numbers use an exact test. Count one conversion type at a time. Turn conversions into revenue with the ROAS calculator, and see the maths behind confidence in the confidence interval calculator.
Frequently asked questions
What is a good conversion rate?
It depends on the offer, traffic source and what counts as a conversion. Compare against your own past results rather than general averages.
Visitors or sessions?
Either, as long as you use the same measure for every version and period.
Is the Conversion Rate Calculator free?
Yes, the Conversion Rate Calculator is free. The first time you see your first result, you are asked for your name and WhatsApp number once. After that, this and every other Uncodemy tool opens straight away without the form.