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
Watch video

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

  • Smart Coaching
  • Features
  • Specs

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. Available on the Polar Flow web service. More ›

Recovery Status

Shows you the time necessary to recover before your next training session. Available on the Polar Flow web service. More ›

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. More ›

Running index

Shows how your running performance is developing. More ›

Training benefit

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

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. More ›

Activity Guide

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

Activity Benefit

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

Running Program

Train for a running event with a personal and adaptive training plan in Polar Flow. Choose from four different targets, 5K, 10K, half marathon and marathon, and get a training plan that fits you and your goals. More ›

M400 whiteM400 blackM400 blueM400 pinkM400 red

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.

Predict your event finish times

Based on your long-term progress, Running Index analysis predicts your event finish times for 5K, 10K, half marathon and marathon runs.

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.

Speed and distance also indoors

Measure your speed and distance while running or walking indoors – all from the movement of your wrist.


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

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 from the official Polar webstore or find retailer

Webstore available in selected countries

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
2016.09.29Polar Flow web service update - Running Program enhancements and bug fixes
2016.09.02Polar Flow App for iOS with Les Mills sport profiles
2016.09.01Les Mills is here!
Product Support


Upgrade your performance

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

M400 is rated 3.4285714285714284 out of 5 by 119.
Rated 5 out of 5 by from Fantastic Watch Bought almost 2 years ago to replace a problematic Suunto and the watch is still going strong. The M400 is almost limitless in the number of different activities it can track and is very easy to use. Having worn it on a daily basis I can say that the screen can scratch but no worse than any of my other watches. This watch is not perfect and is missing a few functions that I would like to have but overall I think it is one of the best all in one true fitness tracker, GPS, heart monitor sport watches on the market.
Date published: 2016-10-07
Rated 4 out of 5 by from Cannot read the watch I just bought a M400. It has great feathers and I want to use it. BUT I am 75 and when I run I do not wear my glasses - thus I cannot read the watch on my wrist. I need a feature to show some parts of the screen in large format so I can read it in the sun without my classes.
Date published: 2016-10-05
Rated 3 out of 5 by from Good tracker/charging issues I have two of these watches. I had to buy another one so I could have one available to use when I have to send the other one in for warranty. The main issue and this has been beat to death is the charging port issues. It's very erratic and I've had to have the ports replaced on both of mine once already and am experiencing problems with the other. The one watch is very difficult to get to lock to GPS the other one seems to do it pretty quick. Those are the complaints. The good stuff is that tracking things like road and mountain bike rides and even motocross training sessions and keeping track of it all in the polar flow app is totally awesome. I love this aspect and just having it keep track of my daily activity is very motivating for me. Adding new routes to my log is motivating me to try new places. I won't do any type of workout without my heart strap and the watch tracking it. It's very motivating to go on a 3 hour bike ride and see that 3-4000 calories were burned and I reached 500% of daily goal.
Date published: 2016-09-17
Rated 3 out of 5 by from Pretty decent with not too many options I have had this watch for over a year now. It's still hard for me to set the intervals but for everyday running, it works pretty well. Lately, it will not sync with computer using the cord, until I try it 5 - 6 times. Very frustrating.
Date published: 2016-09-12
Rated 5 out of 5 by from Great product Had my M400 for about 2 weeks now and absolutely love it. Not too much but enough features for what I do. Also the app is user friendly and displays all the info I need.
Date published: 2016-09-09
Rated 1 out of 5 by from M400 This watch is terrible at syncing to ANYTHING!!! I followed all the online support instructions and nothing worked. My co-worker has the same watch and even more issues with it than me! My memory is getting low on the watch and I cannot even sync it to anything to gain more memory.... then the watch will be useless and a waste of $ for me. I do not recommend this watch to anyone unless you would like to waste your money.
Date published: 2016-08-29
Rated 3 out of 5 by from So far an OK watch the watch is Ok but works very badly with the app. very very badly. i tried ios and android
Date published: 2016-08-16
Rated 3 out of 5 by from Back button does not work I bought my polar M400 about a year ago. After i finished my workout today the back button did not work and I cannot sync to my phone. The USB port will not allow me to sync either because it continues to give me a message that it is not connected to my computer.
Date published: 2016-08-15
  • 2016-10-08T07:09CST
  • bvseo_cps, prod_bvrr, vn_cps_3.4.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_119
  • loc_en_US, sid_85611, PRD, sort_mostRecent
  • clientName_polar
  • bvseo_sdk, p_sdk,
  • CLOUD, getContent, 24.53ms


Find your perfect match

Not the product for you? See below for other great options from Polar.

Compare all products

Polar V800

The Polar V800 is an advanced multisports GPS watch for serious sports enthusiasts and professional athletes who want to reach peak performance.

Starting from $449.95

Learn more