Calculator inputs
Enter your current speed, target speed, traffic mix, and business assumptions. Results appear above this form after submission.
Example data table
This example shows how the calculator can translate page speed improvement into projected traffic, conversion, and revenue outcomes.
| Current Load (sec) | Target Load (sec) | Monthly Sessions | Organic Share | Mobile Share | Bounce Rate | Conversion Rate | Average Order Value | Projected Monthly Revenue Lift |
|---|---|---|---|---|---|---|---|---|
| 4.80 | 2.60 | 65,000 | 58% | 72% | 46.00% | 2.40% | $85.00 | $32,722.08 |
Formula used
Speed Delta = Current Load Time − Scenario Load Time
Adjusted Conversion Lift (%) = Speed Delta × Conversion Lift Per Second × Mobile Multiplier
Adjusted Bounce Change (points) = Speed Delta × Bounce Change Per Second × Mobile Multiplier
Adjusted Organic Lift (%) = Speed Delta × Organic Lift Per Second × Mobile-Weighted SEO Factor
New Sessions = Monthly Sessions × [1 + (Organic Share × Adjusted Organic Lift)]
New Conversion Rate = Current Conversion Rate × [1 + Adjusted Conversion Lift]
Orders = Sessions × Conversion Rate
Revenue = Orders × Average Order Value
The model is scenario-based, not causal proof. It helps estimate likely business impact from performance improvements using the sensitivity settings you provide.
How to use this calculator
- Enter your current and target page load times in seconds.
- Add monthly sessions, organic traffic share, and mobile share.
- Provide current bounce rate, conversion rate, and average order value.
- Set your performance sensitivity assumptions for conversions, bounce, and SEO lift.
- Click Calculate Impact to generate projected outcomes.
- Review the summary cards, comparison table, and Plotly graph.
- Download a CSV for analysis or a PDF for reporting.
- Adjust assumptions to test conservative, expected, and aggressive scenarios.
FAQs
1. What does this calculator measure?
It estimates how page speed changes may affect traffic, bounce rate, conversion rate, orders, and revenue. It combines SEO and onsite behavior assumptions into a single business model.
2. Is this calculator only for ecommerce sites?
No. You can use average order value as lead value, signup value, or pipeline value. That makes the model useful for lead generation, publishing, SaaS, and ecommerce projects.
3. Why is mobile share included?
Mobile traffic is usually more sensitive to poor performance. The calculator increases modeled impact when mobile share is high, making estimates more realistic for mobile-heavy websites.
4. What is conversion lift per second?
It is your assumption for how much the conversion rate improves when the page becomes one second faster. Use a conservative value when you want safer forecasts.
5. Can the calculator model a slower future page?
Yes. If the target load time is slower than the current time, the calculator can show the projected downside in traffic, bounce, orders, and revenue.
6. What does the impact index mean?
The impact index is a weighted summary of revenue, order, traffic, and bounce effects. It helps compare scenarios quickly, but it is not an industry-standard score.
7. How should I choose SEO lift assumptions?
Use past SEO tests, field performance data, or conservative scenario planning. Start with small percentage values, then compare several runs to understand the likely range.
8. Are these results guaranteed?
No. They are modeled estimates based on your assumptions. Use them for prioritization, business cases, and scenario planning rather than as guaranteed financial outcomes.