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FIT to ZWO Converter

Convert power-based FIT files to Zwift ZWO workouts

Your Data is Secure

All file conversions happen directly in your browser. We never upload, store, or save your files on any server. Your data remains completely private and secure.

How to Convert FIT to ZWO

Follow these simple steps to convert your files quickly and easily

Step 1

Upload Your FIT File

Click the upload area above or drag and drop your FIT file. Only power-based FIT files can be converted to structured Zwift workouts.

Step 2

Click Convert

Click the convert button to process your FIT file. The converter analyzes power data to create corresponding Zwift workout intervals.

Step 3

Download Your ZWO File

Once conversion is complete, download your new ZWO file. Import it into Zwift to ride your structured workout.

Your files are processed securely in your browser - nothing is uploaded to our servers

About FIT to ZWO Conversion

Learn more about the converter and its creator

Jonas

Jonas

I'm a software developer and sports enthusiast. I created these converters to help athletes manage their workout data efficiently.

Convert FIT files to ZWO format easily with our workout converter. Whether you want to convert workout files from your outside rides or transform recorded workouts into Zwift workouts, our tool helps you convert fit to zwo format efficiently. This conversion process analyzes your power data to create structured indoor training sessions.

Requirements

To convert a FIT file to ZWO format, you need:

  • A FIT file containing power data (from a power meter or smart trainer)
  • Your current FTP (Functional Threshold Power) value

Understanding the File Formats

FIT File Format

The fit format captures comprehensive workout data including:

  • Power output
  • Heart rate
  • Cadence
  • GPS coordinates
  • Timestamps

ZWO Workout Format

When you convert to a zwo file, it contains structured data with:

  • Relative power targets (% of FTP)
  • Interval durations
  • Workout structure
  • Workout description

How the Conversion Works

1

Power Data Analysis

The converter analyzes your power data to identify distinct segments and intervals in your workout. It looks for periods where your power output was relatively stable or followed specific patterns.

2

FTP-Based Conversion

Using your provided FTP value, the converter transforms absolute power values (watts) into relative intensities (% of FTP) that Zwift understands. This ensures the workout matches your current fitness level.

3

Interval Creation

The converter creates appropriate workout intervals based on your power data. This includes:

  • Steady-state intervals for consistent power sections
  • Warm-up and cool-down periods
  • Work intervals for higher intensity sections

Best Practices

Choose Quality FIT Files

  • Use FIT files from rides with consistent power data
  • Avoid files with lots of coasting or zero power readings
  • Choose workouts that represent the training you want to repeat

Use Current FTP

  • Enter your most recent FTP value
  • Update the workout if your FTP changes significantly
  • Consider recent testing or performance to estimate FTP

Using the Converted Workout

In Zwift

  1. Place the .zwo file in your Zwift workouts folder
  2. Launch Zwift and select "Workouts"
  3. Find your converted workout in the custom workouts section
  4. Start the workout and follow the power targets

Important Note

The quality of your converted workout depends on your fit file data quality. To successfully convert workout files, ensure your recordings have consistent power data. Always review the zwo workout structure before starting your training session.