Savings calculator
Bandwidth savings only. 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 2.1. 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 from the 1.15 packaging channel. See the optimizations side by side on the filter examples, or read the case for self-hosted image optimization.