Forerunner 45S is the smaller-sized GPS running watch with all the running-related features you need in a sleek, lightweight smartwatch you’ll want to wear all day and night.
Monitors heart rate at the wrist1, because a finger on the pulse is so old school.
For concrete proof that you crushed it, GPS tracks pace, distance, intervals and more.
Get yourself on the road to glory with free Garmin Coach adaptive training plans.
Say goodbye to missed texts with smart notifications2 delivered right to your wrist.
We’ve got your back with built-in incident detection and assistance features3.
Log more miles between charges with up to 7 days of battery life.
Run far with a smaller-sized lightweight watch that fits comfortably and won’t hold you back.
The sweat-ready silicone band makes chafing a thing of the past.
These adaptive training plans feature guidance from expert coaches and free training plans that adapt to you and your goals. Workouts sync right to your watch.
Switch up your workout routine with activity profiles for cycling, treadmill running, indoor track, elliptical, cardio, yoga and more.
Get heart rate data1 along with alerts if your heart rate stays too high or too low while you’re at rest. Gauge how hard your heart is working during activities, even underwater.
Track where you run, and get accurate stats, including distance, pace and intervals.
Run to your heart’s content with up to 7 days of battery life in smartwatch mode and up to 13 hours in GPS mode.
Find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity.
Track your body’s energy levels so you can find the best times for activity and rest.
While you’re out and about, Forerunner 45S tracks steps, intensity minutes and more.
chemically strengthened glass
39.5 x 39.5 x 11.4 mm
Fits wrists with a circumference of 124-185 mm
|DISPLAY SIZE||1.04" (26.3 mm) diameter|
|DISPLAY RESOLUTION||208 x 208 pixels|
|DISPLAY TYPE||sunlight-visible, transflective memory-in-pixel (MIP)|
Small: 32 g
|BATTERY LIFE||Smartwatch Mode: Up to 7 days
GPS mode: Up to 13 hours
|WATER RATING||5 ATM|
|MEMORY/HISTORY||80 hours of activity data|
|GPS TIME SYNC|
|AUTOMATIC DAYLIGHT SAVING TIME|
|WRIST-BASED HEART RATE (CONSTANT, EVERY SECOND)|
|DAILY RESTING HEART RATE|
|ABNORMAL HEART RATE ALERTS||yes (high and low)|
|FITNESS AGE||yes (in app)|
|BODY BATTERY™ ENERGY MONITOR|
|RELAXATION BREATHING TIMER|
|GARMIN ELEVATE™ WRIST HEART RATE MONITOR|
Daily Smart Features
|CONNECT IQ™ (DOWNLOADABLE WATCH FACES, DATA FIELDS, WIDGETS AND APPS)||yes (watch faces only)|
|CONTROLS SMARTPHONE MUSIC|
|FIND MY PHONE|
|FIND MY WATCH|
|SMARTPHONE COMPATIBILITY||iPhone®, Android™|
|PAIRS WITH GARMIN CONNECT™ MOBILE|
Safety and Tracking Features
|LIVE EVENT SHARING||Android™ Only|
|INCIDENT DETECTION DURING SELECT ACTIVITIES||yes (Smartphone Required)|
|ASSISTANCE||yes (Smartphone Required)|
Activity Tracking Features
|MOVE BAR (DISPLAYS ON DEVICE AFTER A PERIOD OF INACTIVITY; WALK FOR A COUPLE OF MINUTES TO RESET IT)|
|AUTO GOAL (LEARNS YOUR ACTIVITY LEVEL AND ASSIGNS A DAILY STEP GOAL)|
Gym & Fitness Equipment
|AVAILABLE GYM ACTIVITY PROFILES||Cardio and Elliptical Training, Stair Stepping, Yoga may be added through app|
Training, Planning and Analysis Features
|HR BROADCAST (BROADCASTS HR DATA OVER ANT+™ TO PAIRED DEVICES)|
|GPS SPEED AND DISTANCE|
|CUSTOMIZABLE DATA PAGES|
|CUSTOMIZABLE ACTIVITY PROFILES|
|DOWNLOADABLE TRAINING PLANS|
|VO2 MAX (RUN)|
|TOUCH AND/OR BUTTON LOCK|
|ACTIVITY HISTORY ON WATCH|
|AVAILABLE RUN PROFILES||
Running, Treadmill Running. Indoor Track Running may be added through app
|GPS-BASED DISTANCE, TIME AND PACE|
|CADENCE (PROVIDES REAL-TIME NUMBER OF STEPS PER MINUTE)|
|FOOT POD CAPABLE|
|AVAILABLE CYCLING PROFILES||
Biking. Indoor Biking may be added through app
|ALERTS (TRIGGERS ALARM WHEN YOU REACH GOALS INCLUDING TIME, DISTANCE, HEART RATE OR CALORIES)|
|SPEED AND CADENCE SENSOR SUPPORT (W/SENSOR)|
IN THE BOX
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