Page Load Time Calculator
Estimate load time for any page size across 3G, 4G, 5G and broadband speeds.
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About this tool
Enter your page weight (get it from our Page Size Checker) and see estimated download times across real-world connections — slow 3G to fiber — plus how much time each megabyte you cut would save your median mobile visitor.
How to use the Page Load Time Calculator
- Enter total page size in KB or MB.
- Review load estimates per connection type.
- Set a weight budget that keeps 4G under 3 seconds.
Frequently asked questions
What connection should I optimize for?
The 75th-percentile mobile user — roughly "fast 3G / slow 4G" (~1.6 Mbps effective) for global audiences.
Is download time the whole story?
No — add server response, render and JS execution. This calculator covers the transfer share, usually the biggest.