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The current integration is tailored to Withings BIA scales — the ones that measure body composition, not just weight. It is not a general Withings source, and it does not attempt to cover their watches, sleep mats or blood pressure monitors.

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What it is for

If you own a Withings body-composition scale, connecting it means your weight and body fat percentage arrive automatically instead of being typed in. That matters more than it sounds, because two figures depend on body fat:
  • Metabolic Age needs weight and body fat. Without body fat there is no figure at all.
  • Calories Goal becomes personal rather than a population estimate once body composition is tracked.
See What each number needs.

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Connecting

Data Sources → Withings → Connect, then sign in with your Withings account and approve access.

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What you get

  • Weight
  • Body fat percentage
  • The other composition figures your scale measures

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What it does not cover

Withings watches, sleep tracking mats, and blood pressure monitors are outside the current integration. If you own those, their data will not arrive through this connection. Blood pressure can still be logged by hand in seconds, which is all Vascular Age needs.

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About BIA and daily variation

Bioelectrical impedance — how these scales work — passes a tiny current through you and infers composition from the resistance. It is convenient and reasonable, and it is sensitive to hydration. Weigh yourself dehydrated after a hard session and your body fat reading will jump, without a gram of fat having changed.
Weigh at the same time of day, in similar conditions, and read the trend rather than any single number. This is the general principle in a particularly literal form.

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If you have had a DEXA scan

The Workbench can correct your scale’s bias against it, in Settings. Most scales read consistently high or low, and one clinical measurement is enough to calibrate.

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No scale at all?

Log weight and body fat by hand — Weight and body fat. Body fat is harder to obtain without a scale, but if you have a figure from a gym measurement or a scan, typing it in works exactly as well.