Page Weight Budget Calculator

Find the maximum page size that still loads within a target time on a given connection.

Inputs

Target Connection Speed (Mbps)

Use a realistic 'slow' connection your users might have, not your own fast Wi-Fi.

Target Load Time (seconds)

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Saved Scenarios

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Max Page Size (MB)

18.75

Spark says

How it's calculated

Formula

Max\ Size_{MB} = \dfrac{Speed_{Mbps} \times Target\ Seconds}{8}

\div 8: — Converts megabits to megabytes

What is the Page Weight Budget Calculator?

A performance budget sets a maximum page weight so load time stays predictable — this calculator inverts the download-time formula to find that budget directly.

How to use it

1 Enter the connection speed you're targeting (pick a realistic worst-case, not your own connection).
2 Enter your target load time in seconds.

Worked examples

50 Mbps, 3-second target

Budget is about 18.75 MB.

Try it

Limitations

•Real load time also depends on server response time, number of requests, and rendering — total bytes is only one factor.

Frequently asked questions

What page weight should I target for mobile?

Many teams target under 1-2 MB total for mobile-first pages, since typical mobile connections and devices are slower than desktop.