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Garmin Forerunner 45 vs Forerunner 55 – Check Which One Is Best & Why?

Garmin Forerunner 55 & Garmin Forerunner 45 share many similarities, but there are also important differences, such as quality, performance, features, design, and connectivity. If you want the best one between them, I Would recommend the Garmin Forerunner 55 rather than the Garmin Forerunner 45.

Why Do I Recommend The Garmin Forerunner 55?

  • The Garmin Forerunner 55 features Daily Suggested Workouts for personalized run planning that adapts to fitness progress and prevents training plateaus, whereas the Garmin Forerunner 45 has no adaptive workout guidance.
  • Garmin Forerunner 55 supports PacePro pacing strategy for maintaining goal splits on varying terrain during races, while the Garmin Forerunner 45 includes no advanced pacing strategy.
  • It includes Track Run mode for precise lap distance measurements when running on an athletics track, while the Garmin Forerunner 45 has no track-specific accuracy mode.
  • The Garmin Forerunner 55 supports Pool Swim tracking for dedicated swim metrics during water workouts, whereas the Garmin Forerunner 45 provides no swim-specific tracking data.
  • Garmin Forerunner 55 has up to 20 hours of GPS battery life for longer runs and fewer recharges during training cycles, while the Garmin Forerunner 45 has up to 13 hours of GPS runtime.
  • It features Body Battery energy monitoring for improved daily recovery evaluation and better workout scheduling, while the Garmin Forerunner 45 has no metric to show overall energy readiness.
  • The Garmin Forerunner 55 supports Virtual Run mode to broadcast pace and cadence to treadmill apps for realistic simulation workouts, whereas the Garmin Forerunner 45 does not support virtual running platforms.
  • Garmin Forerunner 55 features Recovery Time advisor to help runners avoid overtraining and schedule optimal rest intervals, while the Garmin Forerunner 45 lacks post-workout recovery guidance.

Maybe the Garmin Forerunner 45 can make you comfortable because it’s a little bit cheaper than the Garmin Forerunner 55. But you have to compromise all the above-mentioned features. Now the Decision is Yours. I hope it was helpful to choose the right one.

Side-by-Side Comparison

FeatureGarmin Forerunner 55Garmin Forerunner 45
Battery life (smartwatch mode)Up to 14 daysUp to 7 days
Battery life (GPS mode)Up to 20 hoursUp to 13 hours
Sport profiles countMore built-in profilesFewer built-in profiles
Pool swimming profileYesNo
HIIT workout profileYesNo
Track Run modeYesNo
Virtual Run supportYesNo
Daily Suggested WorkoutsYesNo
Recovery Time advisorYesNo
PacePro pacing guidanceYesNo
Cadence alertsYesNo
Body Battery energy monitoringYesNo
Fitness Age metricYesNo
Respiration rate trackingYesNo
Finish time estimatorYesNo
PriceCheck Forerunner 55 PriceCheck Forerunner 45 Price

What Common Both Can Do?

  • GPS tracking: Both watches include built-in GPS for accurate route mapping and pace measurement during outdoor runs. This ensures runners get reliable distance tracking without carrying a phone.
  • GLONASS support: Each device supplements GPS with GLONASS satellite support. This improves tracking stability in areas like cities and forests where signal quality may vary.
  • Wrist-based heart rate: Both models utilize optical heart rate technology for 24/7 monitoring. This helps users keep track of exertion and resting trends throughout the day.
  • Accelerometer sensor: Each watch uses an accelerometer for indoor activity tracking. This ensures treadmill workouts and daily steps are accurately recorded without GPS.
  • Incident Detection: Both products include safety features that detect falls or events during activities. When triggered, they can send alerts to emergency contacts for added peace of mind.
  • LiveTrack: Each watch allows friends or family to view your live location during activities. This adds an additional safety layer during long runs or outdoor workouts.
  • VO2 Max: Both devices estimate aerobic performance using VO2 Max scoring. This gives users insight into cardiovascular fitness levels and long-term progress.
  • Stress tracking: Both models analyze heart rate variability to estimate stress levels. This helps users manage recovery and avoid overtraining.
  • Smart notifications: Each watch can display calls, texts, and app alerts from a paired smartphone. This allows users to stay connected without checking their phone.
  • Music controls: Both watches support controlling music playback on the phone. This is helpful during workouts when accessing a phone is inconvenient.
  • Garmin Coach support: Both devices support adaptive training plans from Garmin Coach. Runners of any skill level can improve with structured plans and expert guidance.
  • Silicone strap: Both models include lightweight silicone bands designed for comfort and durability. This ensures a good fit during exercise and everyday wear.
  • 5 ATM water rating: Each watch is rated for water resistance up to 50 meters. Users can confidently wear them while swimming, showering, or in the rain.
  • Menstrual cycle tracking: Both devices support cycle logging and symptom tracking. This gives users personalized insights related to training and wellness.
  • Fitness tracking (steps, calories, etc.): Both watches provide daily activity metrics to promote movement and healthy habits. They automatically track steps, distance, and calories burned throughout the day.
  • Sleep monitoring: Each device monitors sleep stages and duration to help users understand rest quality. Insights can guide improvements in recovery and overall health.
  • Connect IQ watch faces: Both support downloadable watch faces for customization. Users can personalize the look and functionality of their device.
  • Stopwatch & timers: Both include straightforward workout and time-management tools that are useful in daily life and training.

Common Features

FeatureGarmin Forerunner 55Garmin Forerunner 45
GPS trackingYesYes
GLONASS supportYesYes
Wrist-based heart rateYesYes
Accelerometer sensorYesYes
Incident DetectionYesYes
LiveTrackYesYes
VO2 MaxYesYes
Stress trackingYesYes
Smart notificationsYesYes
Music controlsYesYes
Garmin Coach supportYesYes
Silicone strapYesYes
5 ATM water ratingYesYes
Menstrual cycle trackingYesYes
Fitness tracking (steps, calories, etc.)YesYes
Sleep monitoringYesYes
Connect IQ watch facesYesYes
Stopwatch & timersYesYes
Price Check Forerunner 55 Price
Check Forerunner 45 Price

FAQ

Is the Garmin Forerunner 55 worth upgrading from the Forerunner 45?
If you run regularly or want more coaching, battery life, and training tools, the Forerunner 55 is a meaningful upgrade over the Forerunner 45. If you only need basic run tracking, the Forerunner 45 is still capable.

Do both watches support built-in GPS?
Yes, both have built-in GPS for accurate distance and pace tracking, so you don’t need to carry your phone while running outdoors.

Which watch has better battery life?
The Forerunner 55 nearly doubles smartwatch battery life and lasts longer in GPS mode, making it better for frequent runners or longer training sessions.

Do either of these watches support swimming?
The Forerunner 55 includes a dedicated pool swim profile, while the Forerunner 45 is water-resistant but does not track swim metrics as a sport mode.

Can both models measure VO2 Max?
Yes, both provide VO2 Max estimates to help users understand cardiovascular fitness and training progress.

Do both watches have optical wrist-based heart rate sensors?
Yes, each device measures heart rate 24/7 and during workouts without requiring a chest strap.

Which model has more advanced training guidance?
The Forerunner 55 includes Daily Suggested Workouts, Recovery Time advisor, PacePro pacing strategy, and Track Run mode, which are not available on the Forerunner 45.

Do both watches provide safety features like Incident Detection?
Yes, both support Incident Detection and LiveTrack when paired with a phone, allowing emergency contacts to be notified if something goes wrong during a workout.

Can these watches show smartphone notifications?
Yes, both display text messages, calls, and app alerts from a connected smartphone.

Is there a size or design difference between the two?
The Forerunner 55 comes in one size at 42 mm, while the Forerunner 45 is available in two sizes, including a smaller version for slimmer wrists.

Do both models support Garmin Coach training plans?
Yes, each watch connects to Garmin Coach to provide free adaptive plans for beginner to intermediate runners.

Which watch has better GPS accuracy?
The Forerunner 55 supports an additional satellite system (Galileo), which can improve accuracy in obstructed environments compared to the older tracking system on the Forerunner 45.

Can either model control music?
Yes, both provide music controls for skipping tracks and adjusting volume on a connected phone, though neither stores music offline.

Do both models support sleep and stress tracking?
Yes, each watch tracks sleep duration, sleep stages, and stress levels throughout the day using heart rate variability data.

Which model is better for future-proofing?
The Forerunner 55 offers more modern software and features that extend its usefulness over time, making it a stronger long-term purchase than the Forerunner 45.