Name: Garmin Forerunner 645 Music
Brand: Garmin
Rating: 81 (8 reviews)

Overview

The Forerunner is a running watch family by Garmin.

The Forerunner 645 Music was released in 2018. The latest model in the family is the Garmin Forerunner 265S.

According to our analysis of reviews from experts around the world, it averages a review score of 81%. This puts it in the highest rated 30% of comparable running watches. According to our analysis of prices across the internet, at current rates it's in the cheapest 20% of running watches.

Garmin Forerunner 645 Music alternatives

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bestDeal	Show prices
priceBand	Price band
released	Released Jan 2018	Oct 2022	Nov 2022	Oct 2022	Oct 2022	Oct 2022
expertReviewScore	Expert Review Score ‌ ‌ 81%	‌ ‌	‌ ‌	‌ ‌	‌ ‌	‌ ‌
Battery life	Battery life 168 hours	288 hours	672 hours	288 hours	288 hours	288 hours
Battery life – GPS mode	Battery life – GPS mode 14 hours	28 hours	111 hours	28 hours	28 hours	28 hours
Screen size	Screen size 30 mm	30 mm	23 mm	30 mm	30 mm	30 mm
Weight	Weight 42 g	87 g	65 g	144 g	94 g	88 g
Height	Height 43 mm	46 mm	45 mm	46 mm	46 mm	46 mm
Resolution	Resolution 240 x 240 px	240 x 240 px	176 x 176 px	240 x 240 px	240 x 240 px	240 x 240 px
Waterproof depth	Waterproof depth 50 m	100 m		100 m	100 m	100 m
Pixel density	Pixel density 283 ppi	283 ppi		283 ppi	283 ppi	283 ppi
Charging time	Charging time 2 hours
Internal storage	Internal storage 4 GB		0 GB		32 GB	32 GB
Activity Tracking Features	Activity Tracking Features Activity detection Activity tagging Coaching Distance tracking Elevation tracking Goal setting Live tracking Pace measurement Route uploads Steps tracking Trackback mode	Activity detection Activity tagging Coaching Distance tracking Elevation tracking Live tracking Pace measurement Route uploads Steps tracking Swim stroke counter Trackback mode	Activity detection Activity tagging Coaching Distance tracking Elevation tracking Live tracking Pace measurement Route uploads Steps tracking Swim stroke counter Trackback mode	Activity detection Activity tagging Coaching Distance tracking Elevation tracking Live tracking Pace measurement Route uploads Steps tracking Swim stroke counter Trackback mode	Activity detection Activity tagging Coaching Distance tracking Elevation tracking Live tracking Pace measurement Route uploads Steps tracking Swim stroke counter Trackback mode	Activity detection Activity tagging Coaching Distance tracking Elevation tracking Live tracking Pace measurement Route uploads Steps tracking Swim stroke counter Trackback mode
Health tracking features	Health tracking features BMI tracking Calorie burn tracking Period notifications Sleep tracking Temperature tracking	BMI tracking Calorie burn tracking Fertility notifications Ovulation prediction Period notifications Period start date predictions Sleep tracking Temperature tracking Water intake tracking	BMI tracking Calorie burn tracking Calorie intake tracking Fertility notifications Ovulation prediction Period notifications Period start date predictions Sleep tracking Temperature tracking Water intake tracking Weight tracking	BMI tracking Calorie burn tracking Fertility notifications Ovulation prediction Period notifications Period start date predictions Sleep tracking Temperature tracking Water intake tracking	BMI tracking Calorie burn tracking Fertility notifications Ovulation prediction Period notifications Period start date predictions Sleep tracking Temperature tracking Water intake tracking	BMI tracking Calorie burn tracking Fertility notifications Ovulation prediction Period notifications Period start date predictions Sleep tracking Temperature tracking Water intake tracking
Sensors	Sensors Accelerometer Barometer Cadence sensor Compass Galileo GPS Gyroscope Heart rate monitor	Accelerometer Barometer Blood oxygenation monitor Cadence sensor Compass GPS Gyroscope Heart rate monitor	Accelerometer Barometer Blood oxygenation monitor Body temperature sensor Compass Galileo GPS Heart rate monitor Monitors perspiration	Accelerometer Barometer Blood oxygenation monitor Cadence sensor Compass Galileo GPS Gyroscope Heart rate monitor	Accelerometer Barometer Blood oxygenation monitor Cadence sensor Compass Galileo GPS Gyroscope Heart rate monitor	Accelerometer Barometer Blood oxygenation monitor Cadence sensor Compass Galileo GPS Gyroscope Heart rate monitor
Alerts	Alerts Inactivity alerts Silent alarm Vibrating alerts	Inactivity alerts Silent alarm Vibrating alerts Voice feedback	Inactivity alerts Irregular heart rate warnings Silent alarm Vibrating alerts Voice feedback	Inactivity alerts Silent alarm Vibrating alerts Voice feedback	Inactivity alerts Irregular heart rate warnings Silent alarm Vibrating alerts Voice feedback	Inactivity alerts Silent alarm Vibrating alerts Voice feedback
Screen features	Screen features Always-on display Damage resistant glass	Always-on display Sapphire glass	Always-on display	Always-on display Sapphire glass	Always-on display Sapphire glass	Always-on display Sapphire glass
Battery features	Battery features Battery level indicator Rechargeable battery	Rechargeable battery	Rechargeable battery Solar power	Rechargeable battery	Rechargeable battery	Rechargeable battery
Common characteristics ANT+Automatic syncingCloud syncingNFCWi-FiWireless syncingIP67Sweat resistantCompatible heart monitorCompatible smart scales

Garmin Forerunner 645 Music: what the experts say (3 reviews)

Garmin Forerunner 645 Music: 5 Expert video reviews

Garmin Forerunner 645 Music characteristics and specifications

Characteristics
Sports	Running (+106)
Brand	Garmin (+68)
Features	Achievements (+72)Auto pause (+69)Calendar sync (+52)Call control (+55)Fall detection (+36)has fast/slow heart rate notifications (+64)measures resting heart rate (+66)measures VO2 max (+62)Multi-sport mode (+70)Music playback (+67)Phone locator (+63)Social network integration (+53)Sunrise/sunset time (+64)Uploadable maps (+45)Widgets (+69)
Activity Tracking Features	Activity detection (+79)Activity tagging (+88)Coaching (+55)Distance tracking (+93)Elevation tracking (+85)Goal setting (+62)Live tracking (+47)Pace measurement (+92)Route uploads (+62)Steps tracking (+92)Trackback mode (+59)
Health tracking features	BMI tracking (+46)Calorie burn tracking (+78)Period notifications (+50)Sleep tracking (+75)Temperature tracking (+51)
Connectivity Types	ANT+ (+65)Automatic syncing (+51)Cloud syncing (+53)NFC (+45)Wi-Fi (+48)Wireless syncing (+63)
Sensors	Accelerometer (+90)Barometer (+75)Cadence sensor (+44)Compass (+82)Galileo (+48)GPS (+92)Gyroscope (+65)Heart rate monitor (+85)
Waterproofings	IP67 (+83)Sweat resistant (+83)
Alerts	Inactivity alerts (+63)Silent alarm (+71)Vibrating alerts (+74)
Supported peripherals	Compatible heart monitor (+72)Compatible smart scales (+50)
Screen features	Always-on display (+71)Damage resistant glass (+30)
Battery features	Battery level indicator (+62)Rechargeable battery (+93)
Colorways	Black, Cerise, Rose Gold, Slate

Specifications		vs Average
Model	645 Music
Released	Jan 2018
Battery
Charging time	2 hours
Battery life – GPS mode	14 hours
Battery life	168 hours
System
Bluetooth version	4
Internal storage	4 GB
Measurements
Volume	24 cm³
Strap width	20 mm
Width	43 mm
Height	43 mm
Thickness	14 mm
Weight	42 g
Temperature
Min. temperature	-20 °C
Max. temperature	60 °C
Waterproofing
Waterproof depth	50 m
Screen
Pixel density	283 ppi
Resolution	240 x 240 px
Screen size	30 mm