Website Revenue Loss Calculator
Find out how much your slow website is costing you every single month — and what fixing it could be worth.
Your website metrics
Adjust the sliders to match your current site performance.
Check yours at pagespeed.web.dev — look for 'Time to Interactive'
Total monthly sessions from Google Analytics or similar
% of visitors who buy or submit a lead form
Average revenue or value per conversion
Speed benchmark
Revenue impact estimate
Monthly Revenue Lost
$27K
due to 2.5s over ideal load time
Annual Revenue Lost
$318K
Conv. Rate Uplift at 2s
+0.4%
"Your site loads in 4.5s — that's 2.5s slower than Google's recommended 2s. This single issue is costing you an estimated $27K per month in lost conversions."
Revenue comparison
Current monthly revenue
$125K
Potential at 2s load time
$152K
Current conversion rate: 2.5% → At 2s: 2.5% (your adjusted rate: 2.1%)
⚡ Fix your site speed
Our web team can typically move a site from 4–6s to under 2s in 2–3 weeks.
Get a web performance audit →Want us to fix your site speed?
Our web team specialises in Core Web Vitals optimisation and performance sprints. Most sites go from 4–6s to under 2s in 2–3 weeks.
Load time vs. estimated conversion rate penalty
| Load Time | Conversion Penalty | Status |
|---|---|---|
| 1s | 0% | Excellent |
| 2s | 0% | Ideal target |
| 3s | ~7% | Acceptable |
| 4s | ~14% | Needs improvement |
| 5s | ~21% | Poor |
| 6s | ~28% | Very poor |
| 8s | ~42% | Critical |
| 10s | ~56% | Critical |
Source: Google, Deloitte Digital, and Portent research. Penalties are estimates — actual impact varies by industry and audience.
How the calculation works
The calculator applies Google's research showing each 1-second delay reduces conversions by ~7%, relative to the 2-second ideal load time benchmark.
Penalty factor
We calculate your speed penalty: (currentLoadTime − 2) × 7%. A 5s site has a 21% penalty. A 3s site has a 7% penalty. Sites at 2s or faster have no penalty.
Revenue comparison
We calculate your current monthly revenue (visitors × conversion rate × avg value), then calculate what you'd earn at a 2s load time using your penalty-adjusted conversion rate.
Monthly loss
The difference between potential revenue (at 2s) and actual revenue (at current speed) is your monthly speed-related revenue loss. Multiply by 12 for the annual figure.
Frequently asked questions
About website speed, revenue impact, and how to fix performance issues.