Garmin Forerunner 15 vs. 25

Written By: Jeremy N

Throughout your training there are a few pieces of equipment that are essential to helping your runs.

One of these crucial items is a running watch

Garmin watches are one of the most well known brands of watches out there on the market, and they are so well known for a reason.

These watches have a variety of different features that make them a good fit for almost every runner on the trails, roads, or track. One of their more popular models of running watches is the Forerunner; however there are numerous different versions of the model.

How could you possibly know which one to pick?

Keep reading to find a great place to begin narrowing your running watch search!

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Garmin Forerunner 15: 

The Garmin Forerunner 15 captures all essential stats for a runner from your run time to your run distance and pace. If you pair it with a heart rate strap, it can also record your heart rate and your heart rate zone so you will know when you hit your target.

Training with a heart rate monitor also allows you to forgive out when you need to rein it in and when you can push yourself harder throughout your run or work out.

Garmin Forerunner 15 Large, Red/Black

If you want to track your steps throughout the day and not just during your runs, with the Forerunner 15 you can do that without having to wear a separate activity tracking device. 

This watch counts your steps and the calories you burn throughout the day regardless of whether you are working out or running or not. Also, you can stay super connected with this awesome watch!

When you upload your data to Garmin Connect, this allows you to monitor your progress toward your fitness goals and to see your overall fitness trends. Forerunner 15 also reminds you when it’s time to move if you’ve been sitting for more than an hour with a small buzz of your watch.

Garmin Forerunner 15 Large, Red/Black

When you get that cue to move, just walk for a couple of minutes to reset the inactivity indicator. The Garmin Forerunner 15 has an auto lap function that automatically alerts you when you complete each mile, giving you a small beep and a backlit screen that flashes your time for that mile.

When you complete your run and save it, you will see a summary of how you did. This includes your total time, your distance, your average pace and your calories burned. The Forerunner 15 even lets you know when you achieve a personal record, such as your fastest mile or your longest run to date.

One of the amazing perks of this watch is that you will not have to worry about charging it every single night. The rechargeable battery will last up to five weeks in watch and activity tracking mode or 8 hours when using it with GPS on your outdoor runs.

Garmin Forerunner 15 Large, Red/Black

The Forerunner 15 has a water rating of 5 ATM (50 meters). This means that it resists rain and sweat and can even join you for a swim! Finally, with a simple connection to your Mac or PC, you can upload your activities to our free online fitness community, Garmin Connect.

This means that you can see your run on a map, get more details on each mile, see a daily summary of your activities and share your activities with friends. You can also join online challenges and earn virtual badges for extra motivation.


Garmin Forerunner 25: 

Take the next step in your running watch journey with this super easy-to-use and GPS watch that can track how far, how fast and how long you’re running. In addition to just the basics, his watch allows you to stay connected on your runs with call and text alerts when it is paired with a smartphone.

Garmin Forerunner 25 (Large) - Black and Red

The heart rate compatibility on the watch itself allows you to train with heart rate zones. This way you can heart rate train and know when to push it on that last mile of a work out or when to reign it in. It also provides more accurate information about your calories burned.

Fitness progress doesn’t stop after your run as the Garmin Forerunner 25 keeps track of your daily steps as well, whether you’re indoors or outside.

Garmin Forerunner 25 (Large) - Black and Red

With a paired compatible smartphone or a simple computer connection, you are now able to upload your activities to our free online fitness community, Garmin Connect.

On Garmin Connect, you can see your run on a map, get more details on each mile, see a daily summary of your activities, and share your activities and runs with your friends. You can also join online challenges and earn virtual badges for extra motivation.

Garmin Forerunner 25 (Large) - Black and Red

Additional connected features include live tracking, where you can let your family and friends follow your run in real time. This awesome version of the Garmin Forerunner watch also has the awesome feature that will remind you to tell ve after an hour of staying sedentary.

Finally, the small watch has a battery life of eight hours on GPS or eight weeks on watch and activity tracking mode. The larger watch has a battery life of up to ten hours on GPS and up to ten weeks on regular watch and activity tracking mode. 

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Conclusion: Forerunner 15 vs. 25

Both of these watches have incredible features that will suit any kind of runner. However, if you are a triathlete or simply enjoy swimming for your cross training, I highly recommend the Garmin Forerunner 15 as you can swim with the watch on.

If you are only using your watch to run and track your daily activities, I highly recommend the Garmin Forerunner 25. Hopefully this article has helped you to narrow your search for a new running watch. Happy running!


Last update on 2023-09-25 / Affiliate links / Images from Amazon Product Advertising API

Hi, Jeremy Here, 

I am the the guy behind Train for a 5K. On this site, I share everything that learned along my running journey. The content I create is the running training I wish I had before we started this journeyAbout Jeremy. 

I have run over 250 races including the California International Marathon, Clarksburg Country Run, and various other 5K & 10K races throughout the United States. I am a former Athletics department employee at University of the Pacific and Shoe Consultant with Dicks Sporting Goods

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