Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Annualized profit value of the win
$129,600
Monthly profit value
$10,800
Incremental conversions per month
320
Days to pay back implementation cost
23
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter monthly traffic to the page.
- 2Enter baseline conversion rate (%).
- 3Enter winning variant conversion rate (%).
- 4Enter average order value ($).
- 5Enter contribution margin (%).
- 6Enter one-time implementation cost ($).
- 7Read your annualized profit value of the win on the right — it updates as you type.
- 8Hit Share to keep the scenario or send it to someone.
About this calculator
A landing page test that lifts conversion rate from 3.0% to 3.4% sounds small, but multiplied across a year of traffic it can be worth six or seven figures, and that annualized number is what should drive prioritization of design and dev resources, not the raw percentage point. This calculator takes your test's baseline and winning conversion rates, monthly traffic to the page, and average order value, and computes the incremental conversions and revenue you'd expect to capture per month and per year by shipping the winner permanently. It also nets out a one-time implementation cost to show payback time in days, which is useful for justifying engineering time against other roadmap items competing for the same sprint. Keep in mind this projects forward only as long as traffic volume and the underlying conversion dynamics stay similar — seasonal traffic mix shifts, and a change in ad spend or audience quality can shift baseline conversion rate independent of the test result, so re-validate the win periodically rather than assuming it holds forever.
Worked example
Using the values the calculator loads with:
Inputs
- Monthly traffic to the page: 80000
- Baseline conversion rate: 3 %
- Winning variant conversion rate: 3.4 %
- Average order value: 75 $
- Contribution margin: 45 %
- One-time implementation cost: 8000 $
Results
- Annualized profit value of the win: $129,600
- Monthly profit value: $10,800
- Incremental conversions per month: 320
- Days to pay back implementation cost: 23
What each field means
Inputs
- Monthly traffic to the page
- The monthly traffic to the page used in the calculation. Starts at 80000 so you have a working example on load.
- Baseline conversion rate (%)
- The baseline conversion rate used in the calculation, measured in %. Starts at 3 % so you have a working example on load. Accepted range: 0–100 %.
- Winning variant conversion rate (%)
- The winning variant conversion rate used in the calculation, measured in %. Starts at 3.4 % so you have a working example on load. Accepted range: 0–100 %.
- Average order value ($)
- The average order value used in the calculation, measured in $. Starts at 75 $ so you have a working example on load.
- Contribution margin (%)
- The contribution margin used in the calculation, measured in %. Starts at 45 % so you have a working example on load. Accepted range: 1–100 %.
- One-time implementation cost ($)
- The one-time implementation cost used in the calculation, measured in $. Starts at 8000 $ so you have a working example on load.
Results
- Annualized profit value of the win
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Monthly profit value
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Incremental conversions per month
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Days to pay back implementation cost
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Should I use revenue or profit for this calculation?
Profit (revenue times contribution margin) is the honest number, since the incremental orders also carry cost of goods and payment processing. Reporting raw revenue lift overstates the win's actual value to the business and can lead to over-investing in similar tests relative to their real payoff.
How long should I expect the lift to hold?
As long as the underlying page, traffic sources, and offer stay similar. Re-check quarterly, since a shift in paid channel mix, a pricing change, or a new competitor promotion can move baseline conversion independent of your page design, making the original lift estimate stale.
What if traffic to the page changes a lot seasonally?
Run the calculation using an average monthly traffic figure across a full year rather than picking a peak or trough month, since either extreme would misstate the annualized value in one direction.
Is winning a test enough to justify shipping it everywhere?
Only if the traffic and audience on other pages resemble the tested page. A win on your highest-intent bottom-funnel landing page doesn't necessarily transfer to a colder top-of-funnel page with a different visitor mix and different objections.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Landing Page Conversion Lift Value Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/landing-page-conversion-lift-value
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/landing-page-conversion-lift-value" target="_blank" rel="noopener">Landing Page Conversion Lift Value Calculator — RevenueLab</a> (2026).</p>
Source: [Landing Page Conversion Lift Value Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/landing-page-conversion-lift-value) (2026).