Conversion Rate Calculator

How to use the conversion rate calculator

1. Visitors: enter the number of people who saw the page, email or offer. Use unique visitors if your analytics tool gives you the choice, so one person who came back three times counts once.
2. Conversions: enter how many of those people did the one thing you were hoping for. Pick a single action: joined the waitlist, paid a deposit, booked a call or completed a purchase.
3. Money spent (optional): enter what you paid to bring in those visitors, such as ad spend for the same dates. Use 0 if the traffic came from free posts or word of mouth.
4. Conversions you want (optional): enter a target to see how many visitors, and how much spend, it would take at your current rate.

Make sure both numbers cover the same dates and the same page. Visitors from the whole site divided into signups from one page gives a rate that means nothing.

The conversion rate formula

The calculator counts conversions per visitor, which is the usual convention for landing pages and signup forms. Some analytics tools count per session (visit) instead, so the same data can show a slightly lower rate there when people visit more than once. If you enter more conversions than visitors, the result is capped at 100% and the calculator tells you to check your counts.

A worked example

Say you have an idea for a meal-planning app. Before building anything, you put up a one-page site with a waitlist form and spend $400 on ads. Over two weeks, 2,000 people visit and 50 join the waitlist. You want 100 names before you commit to building.

So reaching 100 signups means doubling the traffic, or improving the page. If a clearer headline lifted the rate from 2.5% to 4%, the same 2,000 visitors would produce 80 signups, and you would need 2,500 visitors for 100 instead of 4,000.

How to read your conversion rate when you are testing an idea

A landing page test is a low-cost way to validate a startup idea: you describe the product, ask for a small commitment and see who says yes. The conversion rate is your result. Three things decide how much weight it can carry.

• How much the action costs the visitor. An email address is cheap to give. A paid pre-order is strong evidence. A lower rate on a harder ask can be the better signal.
• Who the visitors are. Friends and followers convert far more readily than strangers. Traffic from people who match your ideal customer profile and do not know you is the fair test.
• How many visitors you had. With 10 visitors and 1 signup your rate is 10%, and one more signup makes it 20%. Small samples jump around. The survey sample size calculator explains how the margin of error shrinks as the numbers grow.

Be careful with benchmark figures you find online. Typical rates differ widely by industry, price, traffic source and what is being counted, so the most useful comparison is your own page last week against your own page this week. A signup is also a weaker signal than a conversation. In Fonda's Validate phase you talk to real customers before you get a Verdict of go, refine or pivot, and a page test works best next to those interviews, not in place of them.

How to improve a low conversion rate

• Say who it is for and what it does in the first line. If a stranger cannot repeat your value proposition after five seconds, fix that before anything else. The elevator pitch generator can help you tighten the wording.
• Ask for one thing. One form, one button. Extra links and extra fields both give people a way out.
• Match the page to the ad or post. If the ad promises meal plans for busy parents, the page should open with the same words.
• Fix the traffic, not only the page. A page can be fine and still convert badly because the wrong people are arriving. Try the channels in how to find your first 10 customers.
• Change one thing at a time. If you rewrite the headline, the price and the image together, you will not know which change moved the rate.

What the calculator leaves out

• Statistical confidence. It reports the rate you observed. It does not tell you whether a difference between two pages is real or just chance.
• Steps in a funnel. Visitor to signup, signup to trial and trial to paid are separate conversion rates. Run the calculator once for each step.
• Quality of the conversion. It treats every signup as equal, whether or not that person ever pays.
• Costs other than the spend you enter. Your time, design work and software are not included, so cost per conversion here is lower than your full customer acquisition cost. Use the CAC calculator for that.
• Changes in cost as you scale. The spend-needed row assumes each extra visitor costs the same as the ones you already bought. Ad costs often rise as you reach beyond your easiest audience.