Bandwidth savings only.
Savings calculator
Faster load times and better Core Web Vitals are upside this calculator doesn't count.
AWS CloudFront, GCP, Azure typically $0.05–$0.12/GB
The software is free on every site and every server — the count only sizes the bandwidth math.
Your estimated savings
Annual savings
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ROI
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Illustrative estimate, not measured product output. We measure 48–69% page-weight reduction across our demo pages; this calculator uses a conservative 60%. Actual savings depend on your content mix, original image formats, and quality settings.
Show methodology — monthly breakdown
Current monthly bandwidth
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Optimized bandwidth
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Bandwidth saved
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Monthly bandwidth savings
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Monthly software cost (open source)
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Net monthly savings
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Illustrative LCP improvement: ~40% faster — an estimate derived from the assumed 60% page-weight reduction, not a measured product output. Industry studies (Google, Deloitte) report that a 100ms improvement in load time can lift conversions by roughly 1–2%.
Bandwidth comparison
The software is free — the savings above are all net.
Beyond bandwidth savings
This calculator counts bandwidth cost alone. The rest of the return on image and CSS/JS optimization is harder to price, and larger:
- • Better Core Web Vitals — Smaller pages load faster, improving LCP and reducing CLS. Google uses CWV as a ranking signal. That means this impacts your revenue, not just your metrics.
- • Higher conversions — Industry data shows every 100ms of load time improvement can increase conversions by 1–2%.
- • No engineering time — No build pipeline, no manual srcset, no image optimization workflow. Automatic and continuous.
- • Free software vs. CDN usage fees — mod_pagespeed costs nothing regardless of traffic or server count. CDN and image-CDN optimization (Cloudflare Business $200/mo per site, Cloudinary usage-based) scales with your bill.
The estimate above counts image and CSS/JS savings from the variant-aware cache in mod_pagespeed. The optimizer worker does that work off the request path; the in-process module inside Apache and nginx minifies CSS/JS and transcodes images to WebP on the same pagespeed directives your configuration already uses. The IIS package ships as a signed installer on the mod_pagespeed GitHub release. See the optimizations side by side on the filter examples, or read the case for self-hosted image optimization.