Health Metric

What is Body Fat?

Measured in: %

Your body fat percentage, measured by a connected smart scale or body composition device.

Definition

What it measures

Your body fat percentage, measured by a connected smart scale or body composition device.

Unit: %

Why Track It

Why it matters

Body weight alone does not tell the full story. Tracking body fat percentage alongside weight shows whether changes are fat or muscle.

Automations

What you can do with Body Fat data.

HC Webhook sends body fat readings to any webhook — here are ideas to get you started.

Body Composition Log

Append body fat percentage alongside weight to a spreadsheet for every weigh-in.

Progress Chart in Grafana

Chart body fat and lean mass over months in Grafana to visualize your body composition transformation.

Goal Milestone Alert

Send a notification when your body fat crosses a target percentage you have set.

Fitness Progress Report

Email a monthly body composition summary showing change in body fat, weight, and lean mass.

Notion Body Composition Journal

Create weekly entries in Notion with body fat, weight, and notes about your training and nutrition.

Trend Tracker Dashboard

Show body fat trend on a Home Assistant dashboard alongside your other health metrics.

Data Format

What the JSON looks like.

HC Webhook posts a JSON object containing a body_fat array to your endpoint on every sync.

{
  "timestamp": "2026-04-15T07:30:00Z",
  "body_fat": [
    { "percentage": 18.4, "time": "2026-04-15T07:30:00Z" }
  ]
}

How to Export

Get Body Fat out of Health Connect

Google Health Connect stores your body fat data from compatible apps (Samsung Health, Fitbit, Garmin, and more). HC Webhook reads that data on a schedule you set and forwards it as JSON to any URL you add — n8n, Home Assistant, Zapier, or your own API.