Tools

Conversion Rate Calculator

Conversion rate from visitors and conversions, or the traffic a target needs. Fill in two of the three.

Fill in any two of visitors, conversions and rate. The third is worked out, and the revenue lines appear as soon as you add an order value.

Everything here is worked out in your browser. Nothing you type is sent anywhere, and there is no account to make.

%

Leave this blank to work it out from the other two.

Optional. Adds revenue and revenue per visitor.

Result

The numbers below are an example so the tool opens working. Replace them with yours.

How the number is worked out

  • Sessions and users give different rates for the same behaviour, and the difference is not small. Whichever you use, use the same one on both sides of any comparison.
  • A rate built on a small number of conversions moves a long way on one more or one fewer. The tool says so when the count is under thirty rather than letting the decimal places imply a precision that is not there.

What comes out

You will see

  • Conversion rate as a percentage
  • Whichever of the three you left blank, worked out from the other two
  • Visitors per conversion, the same fact told as a count
  • Revenue and revenue per visitor, when you enter an order value
  • A warning when the conversion count is too small to carry a rate
  • A warning when all three values are entered and they do not agree

How to use it

Three steps, and the third one is the point

  1. Enter visitors and conversions

    From the same window and the same definition. Sessions with sessions, users with users, never one of each.

  2. Leave the rate blank

    Or enter a target rate and leave conversions blank, to see what that rate would produce on the traffic you have.

  3. Add an order value

    Revenue per visitor appears, and that is the figure worth watching. It moves when the rate moves and when the basket moves.

What a conversion rate is, and what counts as one

Conversion rate is conversions divided by visitors, as a percentage. The arithmetic is trivial and the definitions are where it goes wrong.

The first question is what a conversion is. A purchase, a signup, a form, an add to cart: a store usually has several, and a rate quoted without saying which one is a number nobody can check.

The second is what a visitor is. Sessions and users give different rates for the same behaviour, because one person can return several times. Neither is wrong; mixing them is.

The Conversion Rate Calculator result panel, first state
Visitors and conversions entered with an order value. Revenue per visitor is the line that carries both halves.
The Conversion Rate Calculator result panel, second state
The same page with a small conversion count. The rate still calculates, and the tool names what the count cannot support.

A rate on a small count is a direction, not a measurement

Eleven conversions out of twelve hundred visitors is 0.92%. Twelve conversions out of the same traffic is 1.00%. One order moved the headline rate by nearly a tenth of a point, and nothing about the store changed.

This is why the tool says so when the count is under thirty. The decimal places suggest a precision the sample cannot support, and a decision made on that precision is a decision made on noise.

The same applies to any comparison. Two weeks with fifteen orders each cannot tell you which page is better, however different the percentages look.

The tool

What this one does

  • Solves in three directions

    Leave visitors, conversions or the rate blank and the tool works out that one.

  • Warns on a thin count

    Under thirty conversions and the tool says the rate moves too far on one order to be treated as a measurement.

  • Adds revenue per visitor

    Enter an order value and the figure that carries both the rate and the basket appears next to the one that carries only the rate.

  • Gives visitors per conversion

    One in fifty three is often a more useful sentence than 1.9%, particularly when the conversation is about traffic cost.

  • Checks three entered values

    All three filled and disagreeing by more than one percent gets named rather than silently resolved.

  • Stays out of the definitions

    It does not decide what your conversion is or whether you count sessions or users. It does the arithmetic on whatever you bring, consistently.

Reading the result

What each line is telling you

Conversion rate
The headline. Comparable only against a rate measured the same way, on the same kind of traffic.
Visitors per conversion
How much traffic one conversion costs you. The version to hold against a cost per visitor.
Revenue per visitor
The figure that catches a rate rising while the business falls. If this drops while the rate climbs, something is selling cheaper.
The thin count warning
Not an error. It means the rate is real arithmetic on a sample too small to decide anything with.

A free tool answers one question.
A search audit answers the rest.

We look at your search visibility across Google and the answer engines, and tell you what is costing you orders. No charge for the first look.

In practice

What you can do with it

  • Work out what a target rate is worth

    Enter your traffic and the rate you are aiming at, leave conversions blank, and add your order value. The revenue gap is the size of the prize.

  • Check whether a test can conclude

    Enter the traffic a test will get and the rate you expect. If the conversions land in the thin band, the test cannot answer the question yet.

  • Compare two landing pages

    Run each one. If the counts are small, the tool will tell you the comparison is not ready, which is more useful than a winner.

  • Translate a rate for a meeting

    Visitors per conversion and revenue per visitor land in a room where a percentage does not.

Questions

Conversion Rate Calculator questions

What is a good ecommerce conversion rate?

Published averages usually sit between one and three percent, and they mix together categories, price points and traffic sources that have nothing to do with each other. Your own last quarter is a better benchmark than any of them.

Should I measure by sessions or by users?

Either, consistently. A rate measured on users is higher than the same behaviour measured on sessions, because one person can return several times before buying. Pick one and use it on both sides of every comparison.

How many conversions do I need before I trust a rate?

More than most people use. The tool flags anything under thirty because at that size a single order moves the rate visibly. For deciding between two versions the number you need is larger still, and it should be worked out before the test starts.

Why is revenue per visitor better than conversion rate?

Because a conversion rate can rise while the business gets worse. Push people towards cheaper products and more of them buy, the rate goes up, and revenue falls. Revenue per visitor carries both halves.

Does an add to cart count as a conversion?

It can, as long as you say so and stay consistent. The problem is not which event you pick, it is quoting a rate built on one event and comparing it against a rate built on another.

Is my data sent anywhere?

No. The calculation runs in your browser, with no account and nothing uploaded.

The rest of the set

Fifteen more, all free, all in the browser

A conversion rate is a ratio, so it moves when either half moves. A rate that climbs while orders fall usually means the traffic got smaller, not that the page got better.