WatchFitTool
Garmin Forerunner® 45 — case dimensions and design

Garmin · 2019

Forerunner® 45Size, Dimensions & Wrist Fit

Case Width

42mm

Thickness

11.4mm

Diameter

42mm

Weight

32g

The Garmin Forerunner® 45 sits best on flat wrist widths of about 44–60mm (≈ 11.7–16.0cm wrist circumference). Adjust the slider below to check your wrist.

Check offerCheck Wrist FitCompare

Does the Forerunner® 45 fit your wrist?

Drag the slider to your wrist width and see the Forerunner® 45 overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.

For sports watches, Lug-to-Lug (L2L) is what matters most. Bulky is fine — overhang is not.

mm
40.0mm (small)85.0mm (large)
How to Measure
1

Lay arm flat, palm up.

2

Measure the flat width across top of wrist.

Wrist Width Measurement Guide →
Garmin Forerunner® 45 (010-02156-05)
Case: 42mmL2L: 42mmThick: 11.4mm
Edge Clearance
+6.5mm
Check offer on Amazon
Balanced Fit6.5mm clearance. Comfortable everyday wear with room to spare.

Compare the Forerunner® 45 with…

vs Garmin fēnix® 7S Pro – Sapphire Solar Editionvs Garmin fēnix® 7S Pro – Solar Editionvs Garmin epix™ Pro (Gen 2) – Sapphire Edition | 42 mmvs Garmin epix™ Pro (Gen 2) – Standard Edition | 42 mm

Garmin Forerunner® 45 Full Specifications

Overview1
FamilyGarmin
General8
Battery life
Smartwatch Mode: Up to 7 days GPS mode: Up to 13 hours
Display Size1.04" (26.3 mm) diameter
Color displayYes
Lens Materialchemically strengthened glass
Memory/History80 hours of activity data
Strap materialsilicone
Charging methodGarmin proprietary plug charger
Display resolution208 x 208 pixels
Sensors5
GPSYes
GLONASSYes
GalileoYes
AccelerometerYes
Garmin Elevate™ wrist heart rate monitorYes
Product Info5
Main SKU010-02156-05
Product ID641121
Product NameForerunner® 45
Release Date4/30/2019
Product VariationBlack
Clock Features6
TimerYes
StopwatchYes
Time/dateYes
Alarm clockYes
GPS Time SyncYes
Automatic daylight saving timeYes
Cycling Features2
Speed and cadence sensor support (w/sensor)Yes
Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)Yes
Running Features4
Run workoutsYes
Foot pod capableYes
GPS-based distance, time and paceYes
Cadence (provides real-time number of steps per minute)Yes
What You'll Love3
Display type
Sunlight-visible, transflective memory-in-pixel (MIP)
Water rating5 ATM
Battery life (smartwatch mode)Up to 7 days
Activity Profiles5
GymCardio, Elliptical Training, Stair Stepping
CyclingBiking, Indoor Biking
WellnessYoga
Indoor runningTreadmill Running, Indoor Track Running
Outdoor runningRunning
Daily Smart Features10
CalendarYes
ConnectivityYes
Find My PhoneYes
Find My WatchYes
Weather forecastsYes
Smart NotificationsYes
Smartphone compatibilityiPhone®, Android™
Controls smartphone musicYes
Pairs with Garmin Connect™ MobileYes
Connect IQ™ (downloadable watch faces, data fields and apps)yes (watch faces only)
Activity Tracking Features8
TrueUp™Yes
Move IQ™Yes
Step counterYes
Calories burnedYes
Distance traveledYes
Intensity minutesYes
Move alerts (displays on device after a period of inactivity)Yes
Auto goal (learns your activity level and assigns a daily step goal)Yes
Health & Wellness Monitoring8
Sleepyes (advanced)
Fitness ageyes (in app)
All-day stressYes
Resting heart rateYes
Abnormal heart rate alertsyes (high and low)
Relaxation breathing timerYes
Body Battery™ energy monitorYes
Wrist-based heart rate (constant, every second)Yes
Safety and Tracking Features3
Assistanceyes (smartphone required)
Live Event SharingAndroid™ Only
Incident Detection during select activitiesyes (smartphone required)
Training, Planning and Analysis Features18
HR zonesYes
HR alertsYes
Manual lapYes
HR caloriesYes
Voice alertsYes
Physio TrueUpYes
VO2 Max (Run)Yes
Advanced workoutsYes
Interval trainingYes
GPS speed and distanceYes
Customizable data pagesYes
Touch and/or button lockYes
Activity history on watchYes
Downloadable training plansYes
Customizable activity profilesYes
Auto Pause® automatic timer haltYes
Auto Lap® interval tracking featureYes
HR broadcast (broadcasts HR data over ANT+® to paired devices)Yes

Watches Similar to the Forerunner® 45

Garmin fēnix® 7S Pro – Sapphire Solar Edition

Garmin

fēnix® 7S Pro – Sapphire Solar Edition

42mm

Garmin fēnix® 7S Pro – Solar Edition

Garmin

fēnix® 7S Pro – Solar Edition

42mm

Garmin epix™ Pro (Gen 2) – Sapphire Edition | 42 mm

Garmin

epix™ Pro (Gen 2) – Sapphire Edition | 42 mm

42mm

Garmin epix™ Pro (Gen 2) – Standard Edition | 42 mm

Garmin

epix™ Pro (Gen 2) – Standard Edition | 42 mm

42mm

Garmin Fenix 7S Pro Sapphire Solar

Garmin

Fenix 7S Pro Sapphire Solar

42mm

Garmin Fenix 7S Pro Solar

Garmin

Fenix 7S Pro Solar

42mm

Garmin Epix Pro Gen 2 42mm

Garmin

Epix Pro Gen 2 42mm

42mm

Garmin Epix Pro Gen 2 Sapphire 42mm

Garmin

Epix Pro Gen 2 Sapphire 42mm

42mm

Garmin Approach® S70 - 42 mm

Garmin

Approach® S70 - 42 mm

42mm

Garmin Bounce

Garmin

Bounce

42mm

Forerunner® 45 — Frequently Asked Questions

What size is the Garmin Forerunner® 45?

The Garmin Forerunner® 45 has a 42mm case and is 11.4mm thick.

Will the Garmin Forerunner® 45 fit my wrist?

The Garmin Forerunner® 45 looks balanced on flat wrist widths of roughly 44–60mm (about 11.7–16.0cm circumference). Use the interactive fit tool above to check against your own wrist.

How much does the Garmin Forerunner® 45 weigh?

The Garmin Forerunner® 45 weighs 32g (case only; straps add weight).

What is the best way to compare the Garmin Forerunner® 45 with other watches?

Use our side-by-side comparison tool to see the Garmin Forerunner® 45 next to any other watch — case size, thickness, lug-to-lug and full specs, scaled to real proportions.

← All Garmin watchesBrowse all brandsCompare watch sizes →