How to export weight data from Apple Health
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On your iPhone, open the Health app.
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Tap your profile picture in the
top-right corner.
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Scroll to the bottom and tap
Export All Health Data.
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Confirm the export. Preparing the archive can take a few
minutes — the phone needs to stay unlocked.
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When prompted, choose where to send the resulting
export.zip (AirDrop to your Mac, Save to
Files, email it to yourself, etc.).
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Back here, click
Import from Apple Health… and pick that
export.zip. No need to unzip it first.
Tip: the zip can be hundreds of megabytes
because it contains every health record you've ever logged.
The import streams the file so it doesn't load the whole
thing into memory, but it can still take a minute on big
exports. Weight values stored in kilograms are automatically
converted to pounds; if you prefer kilograms, change the
conversion in the script and re-import.