Running

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 pink

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.

Measurements

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

Tech

Integrated GPS with AssistNow™ satellite prediction technology
Activity sensor
Manual and auto laps
Audio alerts
Waterproof
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

Connectivity

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.

MyFitnessPal

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

Buy Now - $179.95

Support

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
2016.07.05Polar Flow and TrainingPeaks connectivity
2016.06.07Polar M400 firmware update
2016.05.11Polar M400 software update with Strava pause time indicator
Product Support

Accessories

Upgrade your performance

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

M400 is rated 3.4444444444444446 out of 5 by 108.
Rated 5 out of 5 by from Terrific watch, great trainer I purchased my M400 with HR 7 monitor in December 2014 and it's been terrific. I use and depend on it daily. It's not a smart watch; I didn't want one, but the smart notifications work well. Battery life is great; I would estimate I charge every 2 weeks but regardless it's not frequent. I'm impressed with the watch face; through yard work, chores, and daily wear it has no scratches. GPS locks quickly and seems accurate even in thick trees. Otherwise the watch features, syncing with my phone or with flow sync work well. Love that Polar updates watch firmware to add features and upgrades flow app. Polar flow reporting is great. My experiences with customer service have been good. My only request would be to add a regular timer in addition to the interval timer
Date published: 2016-07-26
Rated 4 out of 5 by from M400 will not pair with LG G4 I'm running Android version 6.0 and the only bluetooth device that will not pair to my LG G4 is the Polar M400. I would have returned the product if I had known this problem wasn't going to be fixed.
Date published: 2016-07-24
Rated 5 out of 5 by from Love it! I bought my M400 May 2015 with H7 heart rate monitor. Now July 2016, still in love with it! It has helped me make running become a committed lifestyle. And since I bought the device there have been quite a few updates, like the cadence, Polar Training Program, Recovery Status, to name a few which they added after I got mine, and are now something I can't train without! Love it!! Always look forward to new updates. :)
Date published: 2016-07-22
Rated 4 out of 5 by from Great GPS Watch and Activity Tracker My first time using a polar product and I have enjoyed my watch. I have been using it for a year and a half. I have had some minor issues with syncing the watch to my computer using the cable but have been able to work through it. Some times I have minor issues with the H7 heart rate strap connecting to the watch but again I have been able to work through those minor issues. All in all I have enjoyed my watch. The web based analysis and the smart coaching features have been a great addition. I will be running my first 10K with the watch and using the training system from Polar so we shall see how well I do with that.
Date published: 2016-07-11
Rated 2 out of 5 by from Better Polar Performance Watches I am true blue Polar work out equipment user. I "upgraded" from my RS400 and Polar Loop so I could combine and take advantage of the daily activity tracker and work out feature into one device. It started off great, but after 2 to 3 weeks the device stopped syncing from either blutooth to my phone or with sync cable directly to my computer. After 20-30 minutes of trying to sync and resetting to factory and starting all over, I took the device back to BB and got a replacement. After 5 weeks with the replacement M400, the same thing starting happening. I started a warranty ticket, but with me having to pay for delivery to and from Polar, plus time without the device, I simply was not worth the return to Polar. Instead, I took it back to BB and opted not to replace it. I am back to using my RS400 and polar loop. I really wanted this to work, because I of my loyalty to Polar. There are other Polar devices that may have less issues than the M400.
Date published: 2016-07-03
Rated 2 out of 5 by from After 7 months of use, STILL having issues I bought this watch last November. Having used Polar in the past (had my previous one for 3yrs and was a basic HRM w/strap. Had no issues) I decided to upgrade my watch being that I wanted to be even more acurracte
Date published: 2016-07-02
Rated 3 out of 5 by from Windows Mobile support missing I've got M400, overall I am satisfied, but I would really appreciate support for Windows Mobile - syncing only over USB cable is not so comfortable...
Date published: 2016-06-29
Rated 1 out of 5 by from CANNOT SYNC WHATSOEVER This was my second running watch, the first being a Garmin. Needless to stay by my star rating, once my m400 dies ill be going back to Garmin. This watch is simply too unreliable. I have NEVER been able to Sync using my Polar Flow iPhone App - the watch ALWAYS says syncing failure or will get stuck syncing so I have to reset the watch altogether. Now I cant even sync with a chord on the computer. Its great to keep track of distance, HR, etc, but its a smart watch that doesn't act smart because you can't even sync it at all.
Date published: 2016-06-28
  • 2016-07-29T06:58CST
  • bvseo_cps, prod_bvrr, vn_cps_3.3.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_108
  • loc_en_US, sid_85611, PRD, sort_mostRecent
  • clientName_polar
  • bvseo_sdk, p_sdk, 2.4.0.0
  • CLOUD, getContent, 33.24ms
  • REVIEWS, PRODUCT

Products

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