Free Garmin Body Composition CSV Generator

Your measurements

Units

Date of measurement

Date format

Weight

Height (auto-calculates BMI)

BMI (auto-calculated)

−

Body fat % (optional)

Need to import multiple dates? The guide below explains how to add extra rows. Adding steps, calories or distance for missing days instead? Use the free activity tool.

How to import
into Garmin Connect

The whole process takes under two minutes. Here's exactly what to do once you have your file.

Fill in your measurements and download

Enter your date, weight, height (so BMI auto-calculates), and optionally your body fat percentage in the tool above. Hit Download Garmin CSV. The file saves instantly. Nothing is sent to a server. It all runs locally in your browser.

Note on dates: No timezone adjustment is needed. The date you pick is the exact date the measurement appears in Garmin Connect. The CSV format uses a plain calendar date, not a UTC timestamp.

Open the Garmin Connect import page

Go to connect.garmin.com/modern/import-data in your browser and log in. This is Garmin's official import page. It accepts both CSV and FIT files. You must use the web browser version; the Garmin Connect mobile app doesn't support CSV imports.

Drag your file into the import box

Drag your downloaded file onto the upload area on the Garmin Connect import page, or click the area to browse and select it. Garmin will detect it as body composition data automatically.

Getting an upload error? This is a known Garmin bug that affects all CSV imports, not specific to this file. The data almost always imports successfully anyway. Try refreshing and re-importing if it doesn't appear.

Verify it's showing in Garmin Connect

After the import, go to Health Stats → Weight in Garmin Connect. Your entry should appear on the correct date. If you included body fat %, it shows in the same section.

Not appearing? Double-check the date you entered isn't in the future, Garmin can silently drop future-dated entries.

Adding multiple dates (manual method)

Download one CSV from the tool, then open it in a plain text editor, Notepad on Windows, or TextEdit on Mac set to plain text mode. Each row below the header is one measurement. Add as many rows as you need, one per line, following the format:

DD-MM-YYYY,weight_in_kg,bmi,body_fat_%

Example: 15-04-2025,78.5,24.2,18.3

Weight must always be in kilograms in the file, the tool converts lbs automatically. BMI and body fat are optional; leave them empty but keep the comma: 15-04-2025,78.5,,

Important: Use Notepad or TextEdit only. Never use Excel or Word, they corrupt the file format silently.

FAQ

Does this tool store my data?

No. Everything runs in your browser. Your measurements are used to build the CSV file locally and are never sent to any server. Close the tab and the data is gone.

I entered pounds, will the file convert correctly?

Yes. The tool converts your input to kilograms before writing the file, because Garmin Connect requires metric weight in the CSV. BMI is also calculated using the converted value, so everything is internally consistent regardless of which unit system you use.

Why can't I import muscle mass or bone mass via CSV?

Garmin's CSV import only supports weight, BMI, and body fat. Muscle mass, bone mass, and body water exist in Garmin's data model but can only be imported via a binary FIT file, which requires Garmin's Java SDK. That's a significantly more complex process outside the scope of this free tool.

Do I need to worry about timezones?

No, not for body weight CSV imports. The format uses a plain calendar date, not a UTC timestamp. Whatever date you pick is the date it appears in Garmin Connect. Timezones only matter for activity data like steps, which use per-minute UTC timestamps that can shift entries across days.

I have years of Fitbit weight data, can I import all of it?

Not with this tool, it's designed for single entries or small manual additions. If you have a full Fitbit export and want to migrate everything at once, that's exactly what Wearable Converter does. It processes your entire Fitbit Google Takeout JSON and outputs Garmin-ready CSV files split by year. Already have a key?

What's the correct date format in the CSV?

Garmin Connect expects DD-MM-YYYY, day first, then month, then year. If you manually edit the file, follow this exactly. Getting it wrong will either cause the import to fail or silently drop the entry.

Body composition
CSV generator

How to import
into Garmin Connect

FAQ

Moving from Fitbit or Google Health to Garmin?

Body compositionCSV generator

How to importinto Garmin Connect

FAQ

Moving from Fitbit or Google Health to Garmin?

Body composition
CSV generator

How to import
into Garmin Connect