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Forerunner 45 HR

4.1641 out of 5 stars
323 Reviews

Out of Stock

Don't worry though, we have a lot more Heart Rate Monitors in stock than that.

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Forerunner 45 HR

The Forerunner 45 HR from Garmin is a GPS Running Smartwatch that also provides Garmin Coach Training Plan Support so you get maximum gains from your workouts. Its 42mm case size is easy to read while running and cycling and it monitors your heart rate at your wrist so you can leave the strap at home. And in its GPS sensor that tracks your pace, distance, intervals, and more and you have a highly capable watch for any sporting endeavor.

As noted above, the 45 works with Garmin Coach adaptive training plans that bring expert, personalized coaching right to your wrist. It also easily pairs to your smartphone and apps for running, cycling, indoor track, treadmill, elliptical, cardio, yoga, and more. Its connected features include smart notifications for incoming texts and calls, automatic uploads to Garmin Connect, live tracking, and controls for the music playing on your phone. This safety and tracking feature also includes incident detection (during select activities) and assistance and sends your real-time location to emergency contacts. Lastly, its battery life is up to 7 days in smartwatch mode and 13 hours in GPS mode.


  • A running and cycling watch that helps you get the most from training
  • Provides speed, distance, and provides pacing
  • Wrist-based heart rate monitor means no more chest strap
  • Accelerometer eliminates the need for a foot pod
  • Inactivity and interval alerts keep your motivation up
  • Lifestyle metrics include calories and sleep monitoring
  • Larger face (42mm) of the two Forerunner 45s
  • Water-rated to 5 ATM
  • Item #GRMF00G
Strap Material
Face Material
chemically strengthened glass
Heart Rate Monitor
Garmin Elevate wrist
Technical Features
clock, GPS, heart rate, pedometer
ANT+, Bluetooth
Operating System
Garmin Connect
Date Indicator
Weekday Indicator
clock, time/distance alert
Battery Type
rechargeable lithium-ion
Battery Life
[smartwatch mode] up to 7 days, [GPS mode] up to 13 hours
Low Battery Indicator
Forerunner 45S, charging cable, documentation
Claimed Weight
1.3oz (36g)
Face Size
Manufacturer Warranty
1 year

Overall Rating

5 based on 1 ratings

Review Summary

5 Stars - 1 reviews
4 Stars - 0 reviews
3 Stars - 0 reviews
2 Stars - 0 reviews
1 Stars - 0 reviews

Fits Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
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