Shows when you’re improving fitness based on your heart rate

Displays calories burned

Comes with comfortable fabric transmitter and coded heart rate transmission to avoid cross-talk

Suitable for swimming



  • FT4
  • FT4
  • FT4
  • FT4
  • FT4


  • Body measurement features
    • Manual target zone – bpm / %

      Manual target zone – bpm / %

      This feature enables you to define the target zone as you want and is suitable for your training. You can set the target zone for your training as beats per minute (bpm), as a percentage of your maximum heart rate, or as a percentage of your heart rate reserve (HRR%).

    • HRmax (user set)
    • Polar OwnCode® (5kHz) – coded transmission

      Polar OwnCode® (5kHz) – coded transmission

      Coded heart rate transmission automatically locks in a code to transmit your heart rate to the training computer. The training computer picks up your heart rate from your transmitter only. Coding prevents interference from other training computers.

    • Polar OwnCal ® - Smart calories

      Polar OwnCal ® - Smart calories

      The most accurate calorie counter on the market calculates the number of calories burned. Calculation is based on your individual data: your weight, height, age, gender and the intensity of physical activity. Smart Calories are available in heart rate monitors and activity trackers.

    • HR-based target zones with visual and audible alarm

      HR-based target zones with visual and audible alarm

      You can define your target zones for a training session based on heart rate to help define the right intensity. When you are out of the preset zones, the training computer will give a visual and audible alarm.

    • Average and maximum heart rate of training
    • Automatic age-based target zone – bpm / %

      Automatic age-based target zone – bpm / %

      To help you train safely and effectively, the training computer determines your heart rate target zone limits automatically according to your age-based maximum heart rate (220 minus age). The limits are determined either in beats per minute (bpm), as a percentage (%) of your maximum heart rate, or as a heart rate reserve (% HRR). See also Maximal oxygen uptake (VO2max) and Manual target zone.

    • Heart rate – bpm / %

      Heart rate – bpm / %

      Heart rate is the measurement of the work your heart does. Heart rate can be expressed as the number of beats per minute (bpm) or as a percentage (%) of your maximum heart rate.

  • Training features
    • HeartTouch – button-free operation of wrist unit

      HeartTouch – button-free operation of wrist unit

      When HeartTouch is on, different training information during training can be accessed without pressing buttons, for instance, when gloves make pressing buttons difficult, by bringing your training computer close to your transmitter.

    • Graphical target zone indicator

      Graphical target zone indicator

      This feature points out graphically on the display the zone you are in during a training session helping you to stay on the desired intensity zone.

    • ZonePointer
  • Recording features
    • Totals


      Totals includes your training data starting from the last reset enabling you to follow your long-term training.

    • Training files (with summaries) – 10
  • Watch features
    • Backlight
    • Date and weekday indicator
    • Display text in English, German, Finnish, Swedish, French, Portuguese, Spanish, and Italian
    • Dual time zone
    • Button lock

      Button lock

      By activating button lock, training computer buttons are locked, and accidental presses do not cause problems, for instance, during training.

    • Low battery indicator
    • Time of day (12/24h) with alarm and snooze
    • User replaceable battery
    • Water resistant – 30m

In the box


FT4 is rated 3.3 out of 5 by 37.
Rated 3 out of 5 by from Liked it a lot. At first Like others I bought mine (FT4) about 3 years ago and it worked great but then last year the battery died on the watch. No problem, got a new one. But then it couldn't read my heart rate so recently hubby changed out the batteries on the watch and sensor. First day all was well but after that in the middle of the workout it couldn't read it. This happened several days and I kept re-wetting the strap. After use I always wet as instructed and wash once a week. I wish it had sensor on the watch, for a person my size (and female) not exactly comfortable. Now I have to find a watch with sensors on it or an arm strap.
Date published: 2017-01-27
Rated 3 out of 5 by from Might work better for me if I tape it to my ear. What I loved about my old Polar F4: an audible beep sounded if my heart rate was under or over my target zone. I knew to increase or lower the intensity without looking at my watch. I used it for years! Then the chest strap battery went kaput and in that old style, the battery could not be replaced... So... I bought a newer set--FT4 chest strap and watch--advertised as having an audible target HR zone alert. The chest strap is comfortable (I like it even better than my old one!) and works great, but the supposed beep or chime to indicate target heart rate zone is inaudible. Sometimes I can hear the weak little chirp if I raise it to my ear. I'm happy with everything else about the watch and HR monitor. It's just annoying to have to keep looking at my watch to see if my HR is in the zone. I don't know about anyone else, but I don't exercise with my wrist pressed against my ear. What good is an alert that can't be heard?
Date published: 2016-12-08
Rated 3 out of 5 by from Not intuitive As with the original, you need to have the instruction manual handy to operate. Display too small.
Date published: 2016-09-20
Rated 2 out of 5 by from Loved it at first Had worn the old Polar 20 for years. Replaced it with a FT4 and liked it very much but....Only wore it a couple of times when a rash started develop under the belt. Wiped off after each use and washed the belt regularly (after 3 uses). Stopped using the belt and the results of a severe reactions to the belt still evident after 5 weeks!
Date published: 2016-07-26
Rated 1 out of 5 by from Do Not Buy This I had it three months and it died. I did everything - everything - Polar recommends. I also changed the batteries several times. They want you to buy a new chest strap for $20, but I did not end up doing that as, according to Polar, the strap should last 8 or more months. But the REAL tragedy is that I bought an FT7 with the hope that it would be a better watch. Guess what? At 4 months, it is almost dead. Yes, I washed it. Yes, I detached the device on the strap and soaked the strap before wearing. Yes, I changed the batteries. The only way it works at this point is when I have the watch no more than 1 inch from the chest strap. That's right, I have a watch hanging off of my stomach until I buy a NON-POLAR ITEM. Some people have luck with these watches according to these few reviews, but about half do not. You be the judge.
Date published: 2016-06-21
Rated 3 out of 5 by from Great...except for its random "bad hair days!" I have had this FT4 for approximately 4 years. I have used it on/off; most consistently using it for the past 10 months. It jumps all over the place with my heart rate at times. Also, and this part is the serious pain in the butt, the chest strap does not communicate with my watch immediately (even after adding water to the connection area) and so about 10-15-20-30 minutes into a workout it will come on. I am NOT kidding! One day it was so bad it only recorded the last 10 minutes of one of my rare runs and I was super disappointed. Is this caused by my chest strap battery---and if so, there is no possible way to get a new battery in there as I cannot even budge the seal. REI suggested I contact you to see about getting an older, but brand new chest strap for my FT4---not the bluetooth model, please. HELP!
Date published: 2016-06-18
Rated 4 out of 5 by from Accurate watch I love the watch it's been great I've had it since 2013 and yes it almost every day the battery did die about 2 years in and it sat for about 6 months before changing it ever since I did change the battery the watch malfunctions it turns on and off the screen gets a weird I'm always having to set it its a pain especially when it does it during a workout and I lose all my info
Date published: 2016-05-20
Rated 1 out of 5 by from Like others have written this is my second FT 4. Happy with the first one. The second has been problems after the first year or so. Changed batteries a couple of time. I hand wash it in the sink after every use and occasionally wash it in the machine tied up in a sock. The display jumps around. This the most consistent thing about it. I use it in town and out in the mountains when mountain biking. Don't think it is outside interference. Best place to use with gym equipment. Last one for me. as a matter of fact I am looking for something that serves my purpose. That works.
Date published: 2016-05-19
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