CRO Tools & Calculators
Practical tools we use to plan tests, forecast upside, prioritise opportunities, and keep measurement clean.
Everything here is directional — the goal is faster, more consistent decision-making (not false precision).
Not sure which tool to use?
- Finding what to optimise next → Use the CRO Opportunity Finder
- Choosing the right success metrics → Use the Metrics Picker (Primary + Guardrails)
- Planning a test → Use the A/B Test Duration & [Sample Size](/content/what-is/sample-size/ "What is sample size? Sample size measures the number of individual samples measured or observations used in a survey or experiment. For example, if you test 100 tyres for wear and tear, your sample size is 100. If an online survey returned 93,000 completed questionnaires, your sample size is 93,000."/index.html) calculator
- Sizing upside before you build → Use the Conversion Lift Forecast calculator
- Already have a winning result → Use the CRO [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 and judge how well a particular investment has performed compared to others. An ROI calculation is sometimes used along with other approaches to develop a business case for a given proposal. The overall ROI for…"/index.html) (Winning Test Results) calculator
- Building a CRO business case → Use the CRO Program ROI calculator
Prioritise
CRO Opportunity Finder
Quickly size and rank optimisation opportunities across your funnel to find the highest-impact place to start.
Best for: backlog triage & focus
Measure
Metrics Picker (Primary + Guardrails)
Pick a clear primary metric and the right guardrails to avoid false wins and protect user experience.
Best for: clean experiment measurement
Plan a test
A/B Test Duration & Sample Size Calculator
Estimate sample size and how long your A/B test needs to run based on baseline CVR, expected lift, and daily traffic.
Best for: planning & stakeholder expectations
Forecast impact
Conversion Lift Forecast Calculator (Revenue & Profit)
Model incremental revenue and profit from a conversion lift using sessions, CVR, AOV, and gross margin — with a 12-month view.
Best for: sizing upside before build
Evaluate results
CRO ROI Calculator (Winning Test Results)
Translate observed uplift from a completed experiment into estimated monthly and yearly value (revenue + profit).
Best for: valuing winners & rollout cases
Plan a program
CRO Program ROI Calculator
Model compounding month-by-month improvements vs CRO cost, including profit and running ROI over a year.
Best for: budgeting & business cases
Want a second set of eyes?
If you share your funnel entry volume, [baseline conversion](/content/what-is/baseline-conversion/ "Baseline conversion is the average or standard percentage of visitors to a website who convert into customers or complete a desired action. It is used as a benchmark or starting point to measure the success of various marketing and optimization efforts aimed at increasing conversion rates."/index.html) rate, and AOV, we can sanity-check assumptions and recommend the fastest path to impact.