# CRO ROI Calculator (Winning Test Results)

## Estimate revenue uplift from a completed A/B test.

Use this [CRO](/content/what-is/cro/ "What is CRO? CRO (Conversion Optimisation or Conversion Rate Optimisation/index.html) is the process of increasing the percentage of conversions from a website or mobile app.") [ROI](/content/what-is/roi/ "What is ROI? Return on investment, or ROI, is a mathematical formula that investors can use to evaluate their investments."/index.html) calculator to estimate the potential revenue impact of a successful [conversion rate optimisation](/content/what-is/conversion-rate-optimisation/ "What is conversion rate optimisation?"/index.html). test. By entering your test dates, visitor volume, original [conversion rate](/content/what-is/conversion-rate/ "What is the conversion rate?"/index.html) , improved [conversion](/content/what-is/conversion/ "A conversion is the process of turning website visitors into customers"/index.html) rate, and average order value, you can quickly estimate the possible monthly and yearly revenue uplift from a winning test.

## What is a CRO ROI calculator?

A CRO ROI calculator is a simple tool that helps estimate the financial return of improving your website’s conversion rate. Instead of looking only at percentage lift, it translates test results into potential revenue impact.

That matters because conversion rate optimisation is easier to prioritise when the commercial upside is clear. A small increase in conversion rate can produce a meaningful increase in revenue, especially on websites with strong traffic volumes or higher average order values.

## How to use this ROI calculator

To use the calculator, enter the following values:

- **Test Start Date** – the date the experiment began
- **Test Completion Date** – the date the experiment ended
- **Unique Visitors served Test** – the number of visitors included in the experiment
- **Original Conversion Rate** – your [baseline conversion](/content/what-is/baseline-conversion/ "Baseline conversion is the average or standard percentage of visitors to a website who convert into customers."/index.html) rate before the winning variation
- **Optimal Conversion Rate** – the improved conversion rate achieved by the winning variation
- **Average Order Value** – the average amount of revenue generated per order
- **Gross Margin** – the percentage of each sale that remains after direct costs, used to estimate profit uplift (profit = revenue × gross margin)

Once those values are entered, the calculator estimates:

- the percentage lift generated
- the potential monthly/yearly revenue increase
- the potential monthly/yearly profit uplift

### Inputs

- Test start date
- Test completion date
- Unique visitors served test
- Original conversion rate (%)
- Improved conversion rate (%)
- [Average order value (AOV)](/content/what-is/average-order-value-aov/ "What is Average Order Value (AOV/index.html)?")
- Gross margin (%) (optional)

### Results

- Test duration — days
- Percentage lift

* * *

Monthly revenue uplift (estimated)

Yearly revenue uplift (estimated)

Monthly profit uplift (estimated)

Yearly profit uplift (estimated)

Cumulative incremental profit over 12 months

## What the results mean

The calculator is designed to help you translate a conversion uplift into estimated revenue growth.

For example, if a test lifts conversion rate from 2.0% to 2.4%, that may look modest at first glance. But when applied across a full year of similar traffic and average order value, the commercial impact can be significant.

This makes the calculator useful for:

- building a business case for CRO investment
- estimating the impact of a completed test
- prioritising experimentation opportunities
- explaining CRO value to stakeholders

## CRO ROI formula explained

At a simple level, the calculator works by estimating the additional conversions created by the improved conversion rate, then multiplying those additional conversions by average order value.

## Assumptions and limitations

Like any ROI calculator, this tool is directional rather than perfect. The estimates are useful for forecasting and prioritisation, but they depend on a few assumptions.

The main assumptions are:

- traffic volumes remain broadly consistent
- average order value stays stable
- the winning test result can be sustained once rolled out
- external factors such as seasonality, promotions, or channel mix do not materially change performance

## Why calculating CRO ROI matters

Many teams understand that improving conversion rate is good, but struggle to connect that improvement to real commercial value. A CRO ROI calculator helps bridge that gap.

## Who should use this calculator?

This calculator is useful for ecommerce teams, digital marketers, product teams, analysts, and CRO specialists who want a quick estimate of the revenue impact of conversion improvements.