Page speed ROI calculator
Free, no sign-upCould performance work pay for itself? Compare costs and potential returns using your own assumptions.
Traffic and sales
Project scenario
A scenario, not a forecast or net profit. Faster pages alone do not establish a conversion gain.
- Revenue change / month
- Simple payback
Cost breakdown and conversion scenarios
- Contribution after running costs / month
- Affected sessions / month
- Order change / month
- Total project costs
- Relative change to break even
| Relative change | Conversion | Net contribution |
|---|
Calculation and limits
Additional monthly orders = sessions × affected share × current conversion rate × assumed relative change. Revenue change = additional orders × average order value.
Net contribution = (monthly revenue change × contribution margin − monthly running cost) × months − implementation cost. Payback divides implementation cost by positive monthly contribution after running cost.
Page speed does not predict a conversion uplift here. The change is your scenario, not a measurement or confidence interval. All scenarios include the project cost, including no uplift. Assumes immediate, constant results, unchanged traffic and order value, one order per converting session, and no discounting, tax or fixed overhead changes.
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A little more detail
A business case, not a conversion promise
Faster pages can improve the experience. How much that affects sales needs evidence from your own audience, not a universal percentage per millisecond.
Browse performance fix guidesHow much will a faster page improve conversion?
There is no reliable universal formula. Use a small, explicit improvement assumption to compare scenarios, then validate it with your analytics or a controlled experiment. The calculator does not measure your site.
What is the difference between relative lift and percentage points?
A 10% relative increase on a 2% conversion rate gives 2.2%, not 12%. That is an increase of 0.2 percentage points. Keeping these separate avoids greatly overstating the result.
What should be included in project cost?
Include design and development time, testing and one-off implementation costs. Ongoing hosting, software or maintenance changes should be considered separately. This is a scenario, not a forecast of net profit.
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