Xiaomi scale to Garmin Connect: every option compared

Xiaomi scales do not talk to Garmin Connect, and Garmin Connect does not read weight from Apple Health or Google Fit. Here are the eight ways people actually bridge the gap, including the ones that are not our app.

Updated 21 September 2026 · Covers the Mi Body Composition Scale 2 and Xiaomi Body Composition Scale S400

The comparison at a glance

Details, sources and the trade-offs of each option follow. We build Scale Relay, so read that section with that in mind; the others are described from their own documentation.

1. Scale Relay (iPhone app)

Scale Relay has two routes into Garmin Connect. With a Mi Body Composition Scale 2 or S400 it listens over Bluetooth, calculates body composition on the phone and uploads the measurement; the Scale 2 needs no Xiaomi account at all, the S400 a one-time Xiaomi authorization because its Bluetooth frames are encrypted. Since version 1.3 it also relays weigh-ins from any scale whose app saves them to Apple Health, with weight, plus body fat and BMI when that app wrote them, so it is no longer Xiaomi-only. Garmin two-factor authentication is supported.

Best for: iPhone owners who want the whole thing to live on the phone, with no computer, no Raspberry Pi and no cloud account in the middle. The first two Garmin uploads are free so you can confirm it works with your scale before paying once.

Trade-offs: you open the app before you step on the scale, or tap Send on the Health tab; there is no background sync. It uses Garmin's unofficial upload path, like every other tool on this page except the Index S2. See the Scale 2 guide or the S400 guide.

2. MiScale Exporter (Android app)

A free, open-source Android app by Łukasz Świderski. After weighing, you open the app, it reads the measurement from the scale over Bluetooth, computes body composition from your age, height and sex, and uploads to Garmin Connect. It supports Garmin 2FA. For the S400 you have to obtain the scale's Bluetooth key and MAC address first.

Best for: Android users. It is the closest equivalent to Scale Relay on that platform.

Trade-offs: Android only. The scale keeps the last measurement available for about 15 minutes, so you cannot wait until the evening to sync.

3. WebBodyComposition (web app)

The same author's browser version. It uses the Web Bluetooth API, so it works in Chrome or Edge on Android, Windows and macOS. Safari and Chrome on iPhone do not support Web Bluetooth, which is why the project recommends a third-party browser called Bluefy on iOS. It supports the Mi Body Composition Scale 1 and 2.

Trade-offs: the project states that Garmin two-factor authentication is not supported and must be disabled, and on an iPhone it needs the Bluefy browser. No S400 support.

4. WeightSyncr (iPhone app, via Apple Health)

WeightSyncr reads whatever Zepp Life (or any other scale app) wrote to Apple Health and uploads it to Garmin Connect. Its App Store page describes weight only, so body fat, muscle and water are lost; the paid plan adds background sync and syncing of past entries.

Best for: someone who only wants the weight number in Garmin and is happy with a small subscription.

Trade-offs: weight only, and a subscription for automation. Scale Relay's Apple Health route covers the same scales with body fat and BMI, for a one-time purchase, but sends only when you tap.

5. export2garmin (Raspberry Pi, PC or ESP32)

Robert Wójtowicz's project runs on a Raspberry Pi, a Linux or Windows machine with a Bluetooth adapter, or an ESP32 board that sleeps and wakes every few minutes. It scans for the scale continuously, so measurements are uploaded without touching a phone. It supports the Mi Body Composition Scale 2, the S400 and even Omron blood pressure monitors, keeps CSV backups, handles several users by weight range and works with Garmin MFA through an exported token.

Best for: people who already run a Raspberry Pi or Home Assistant and want a fully unattended setup for the whole household.

Trade-offs: a dedicated device near the bathroom, a Python setup, the scale's MAC address and, for the S400, its bind key. It is the most capable option and also the most work.

6. SmartScaleConnect (cloud to cloud)

Alexey Khit's tool takes a different route: instead of Bluetooth, it signs in to your Xiaomi account (Mi Fitness, Xiaomi Home or Zepp Life) with your credentials, reads the measurements the official app already uploaded, and pushes them to Garmin Connect on a schedule. It runs on Linux, macOS, Windows, in Docker or as a Home Assistant add-on, and also supports Fitbit Aria, Tanita and Picooc.

Best for: people who are happy to keep using the Xiaomi app and want an automatic background copy to Garmin.

Trade-offs: your Xiaomi credentials live in a config file, the data passes through Xiaomi's cloud first, and you need somewhere for it to run around the clock.

Not to be confused with SmartScaleSync, a paid web service ($2.49 a month or $18.99 a year, plus $34.99 once for importing history) that supports Withings, Wyze and Renpho scales but not Xiaomi; it does not state on its site how it handles Garmin two-factor authentication.

7. Zepp Life → MyFitnessPal → Garmin Connect

The classic no-extra-software chain from the Garmin forums. Zepp Life records the measurement, a health platform in the middle (Google Fit on Android, Apple Health on iPhone) passes weight to MyFitnessPal, and MyFitnessPal syncs weight with Garmin Connect in both directions.

Trade-offs: weight only, body composition is lost along the way. MyFitnessPal often has to be opened for the sync to fire, and Garmin forum threads report weight not syncing from MyFitnessPal for stretches of time.

8. Manual entry in Garmin Connect

Read the number off the scale and type it into Garmin Connect. Free, takes half a minute, records weight only. If you weigh yourself once a week and do not care about body fat trends in Garmin, this is genuinely fine.

Or: buy the Garmin Index S2

Garmin's own Wi-Fi scale uploads weight and body composition to Garmin Connect with no bridge at all. It costs around €150, roughly five times a Xiaomi scale, and its body-composition readings are not obviously better. If you do not own a Xiaomi scale yet and Garmin is your only destination, it removes the problem entirely.

Frequently asked questions

Sources

• MiScale Exporter on GitHub
• WebBodyComposition on GitHub
• export2garmin on GitHub
• SmartScaleConnect on GitHub
• Garmin Forums: Xiaomi Mi Smart Scale with Garmin Connect
• Garmin Forums: Weight not syncing from MyFitnessPal to Garmin

Try the iPhone route

Scale Relay reads your Mi Body Composition Scale 2 or Xiaomi S400 over Bluetooth, or relays weigh-ins from any scale whose app saves them to Apple Health, and sends the result to Garmin Connect. Two Garmin syncs are free, then a one-time $14.99 purchase.

Download on the App Store

Independent app. Not affiliated with Garmin or Xiaomi.