Polar M400
GPS running watch

Polar M400 is a waterproof GPS running watch and daily fitness tracker. It can help you plan optimal training, break your records, and even find your way back from a run.

Buy now - $179.95
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Smart Notifications

Designed for life

Pair your phone with M400 and get alerts for incoming calls, received messages and push notifications from social media apps to your wrist and stay in the know wherever you are.

Don't miss a thing

See incoming calls and texts at a glance. Answer calls using your watch or decline them when training demands it.

Keep up to date

Read messages conveniently on the M400's display even when your phone is not at hand.

Be where you need to be

M400 alerts you about the appointments on your calendar and makes sure you're always on time.

Stay social

Receive push notifications from social media apps to your wrist and stay in the know wherever you are.

M400 features

Run beyond ordinary

  • Features
  • Specs
  • Smart Coaching

Advanced GPS

The M400’s built-in GPS keeps track of your pace, distance and altitude. With the “Back to start” feature you can safely explore new routes.

Activity tracking

The M400 tracks your steps, activity, sleep and calories 24/7, encouraging you to stay active every day.

Heart rate training

Heart rate training is one of the most effective training methods. Take advantage of it by using a Polar H7 heart rate sensor.

Running cadence from the wrist

Keep an eye on your running cadence to improve your running efficiency and avoid injuries.

Polar Flow

Plan, sync and share your training using the exclusive Polar Flow online service and mobile application. All data is easily viewable.

Smart Notifications

Smart Notifications allow you to see notifications from your phone directly on the screen of your M400.

Individual targets

You can set your own individual training targets and follow your progress towards them using Polar Flow.


Weight 56,6g
Thickness 11,5 mm
Display size 128 x 128 px high resolution display


Integrated GPS with AssistNow™ satellite prediction technology
Activity sensor
Manual and auto laps
Audio alerts
4 MB Flash memory
Rechargeable 190 mAh lithium polymer battery
Battery duration up to 8 hours of training time with GPS and Bluetooth Smart heart rate sensor


Standard micro USB cable for data sync with PC or Mac
Bluetooth Smart with mobile and sensors
Polar Flow web service compatibility with Mac OS X 10.6, OS X 10.7, OS X 10.8, or later, and PC Windows XP, Windows 7, Windows 8, or later
Polar Flow mobile app compatibility
Updatable software
UI languages English, Spanish, Portuguese, French, Danish, Dutch, Swedish, Norwegian, German, Italian, Finnish, Polish, Russian, Chinese, Japanese

Training load

Shows you how your training affects your body and helps you compare the load of different sessions. Monitor your load continuously to recognize your personal limits and adjust training intensity and duration accordingly.

Recovery Status

Shows you the time necessary to recover before your next training session.

Fitness test

A five-minute test that measures aerobic fitness from your resting heart rate, heart rate variability and your background information. Complete the test regularly to see the progress you’re making.

Running index

Shows how your running performance is developing.

Training benefit

Delivers motivating feedback immediately after training and describes the effect of your workout.

Smart calories

Lets you know exactly how many calories you’ve burned based on your weight, height, age, gender, your individual maximum heart rate (HRmax) and how hard you’re training.

Activity Guide

Shows how active you’ve been during the day and gives practical guidance for reaching your daily activity goal.

Activity Benefit

Gives feedback on your daily, weekly and monthly activity, showing how your active choices help you stay healthy.

Read the reviews

“Polar got it right here.”
– DC Rainmaker

The M400 has been positively received worldwide. Read what the experts are saying.

Made easy for you

Sync all your training details between M400 and the Polar Flow web service and app with Bluetooth Smart.

Made easy for you

After training get a quick visual overview of your training and analyze your achievements in the Polar Flow app.

Polar Ecosystem

Get connected

Polar has an entire ecosystem of excellent applications, services and accessories to help you get the most out of our products. Customize them to match your preferred look. Track your progress using the Polar Flow online service and app.

Polar Flow web service and app

Follow your daily progress and get guidance that helps you meet your goals. Learn how your daily habits can improve your wellbeing.

Polar Coach

Free online tool for your coach or personal trainer to easily follow your progress.

Sensor compatibility

For live, accurate heart rate, use the Polar H7 Bluetooth® Smart heart rate sensor. If you're interested in improving your running technique and performance, go with the Stride sensor Bluetooth® Smart.


Keep tabs on your nutrition by connecting with the world’s largest food, nutrition and calorie database (iOS only).

Buy Now

Take the next step

Buy Now - $179.95


Get support and the latest updates

Update your product to take advantage of the latest features and functionalities. Get support and user manuals.

Updates See all
2016.01.20Polar M400 software update with running cadence
2016.01.05Polar Balance – More than just a scale
2015.11.30Training Load and Recovery Status for Polar M400 in Flow


Upgrade your performance

Upgrade your training computer to enhance your experience and achieve a more complete understanding of your performance.

M400 is rated 3.5775 out of 5 by 71.
Rated 5 out of 5 by from Love it. I haven't taken it off except to charge it. I love it.
Date published: 2016-02-05
Rated 4 out of 5 by from I bought this about 3 weeks ago. I like it but I wish that it had more color for the screen except just black. but all and all I would recommend this product.
Date published: 2016-02-05
Rated 1 out of 5 by from Sync - gives me a heart attack! After running many years and km's with a Polar I decided to buy a new running watch and of course that should be a Polar as well. Easy to handle, good GPS, handsome. But the thing that is killing me with this new M400 is the sync. Very, very reluctantly in the beginning, and now a complete flatliner. Gives me a heart attack! Very annoying, and a pity as well since I would like to map the tracks I have been running in this beautiful part of the world: Australia. But sync is a necessity as well: I will loose the GPS capability without periodically updating the watch. I always rinse the watch after the exercise, so salt can not be an issue. Besides that, the watch is water resistant. Dear Polar, what is happening? I bought my watch in October. It was not a cheapie. This M400 is not good enough! Poor performance. How to solve?
Date published: 2016-01-24
Rated 4 out of 5 by from What you see is what you get Got this training assistant as a gift with the Bluetooth smart HR monitor. First things first, I predominantly bike. The features which this device offers are comprehensive enough and compete with other devices for cycling on the market such as Garmin edge. As a unit, it is well built and convenient. Keep it on your wrist of strap it to the handlebars and get going. No product is without its faults however and the M400 is no exception to this. The main problem comes with the software. Not a day goes by that new software needs to get installed, which slows down the whole synch process. I want to plug in, upload and get going. Updates usually take about ten minutes, in fact I'm in the middle of one now... Set this fault aside and you have a monitor that will help you keep check during your rides and accurately record your work. Many different settings for all sorts of activities. Runnings, swimming, soccer, the GPS works great. Never losses signal like some previous products I have owned. Best part is... integrate with Strava ;)
Date published: 2016-01-19
Rated 5 out of 5 by from Underrated! M400 for fitness band and running! I bought this specifically for running and was happy to find that I can use it as a step counter/fitness/sleep band as well...connects to HRM, I can set each mode to show only what I want (miles for running and HR for weights). I can also get notifications from my phone for messages. My daily calories burned are way more accurate now, and I LOVE that I can set this to see WHAT I NEED to see when I'm out for a run without scrolling through a bunch of unwanted info.
Date published: 2016-01-13
Rated 5 out of 5 by from Great Product happy i bought myself a m400 running has always been one of my least favorite things to do and with this watch i fell in love with running. my only complaint is the sleep tracking which isn't too in depth hope to see polar update this soon.
Date published: 2016-01-13
Rated 5 out of 5 by from All around the best device I have owned. This watch is an all around solid unit for tracking all daily activities, indoor and outdoor workouts, and sleeping habits! It is easy to sync to computer or better yet, right to polar flow app on my smartphone. Also have the HR monitor and the cadence sensor for HR training and run cadence. Upgraded from an older Polar watch. I'm glad I did. :) I am active person that trains 5 days a week. And this has held up to my rigrous schedule.
Date published: 2016-01-12
Rated 4 out of 5 by from It's a decent watch I've owned the M400 for a year and wear it nearly every day. I like the activity tracker, love that it reminds me to move, and really like the overall look of the watch. It is slow to gain GPS compared to other watches, I'm really surprised it doesn't have a stopwatch, and I have yet to be able to modify the screens like I've heard it can. The estimated finish time was really awesome for the last half of the year (forgot I had it), it kept me moving for an awesome PR. The app is a bust and I had some trouble getting it to sync, but that was fixed by rinsing the USB port. I have, and will continue to, recommend this watch to anyone who asks. It's a great non-smart, simple-to-use, basic running watch.
Date published: 2016-01-02
  • 2016-02-10T07:58CST
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