`Remember me on this computer` option

Select the `Remember me on this computer` option if you wish to be automatically logged on to the computer in future. Your account will remain active for 45 days. Please do not use the `Remember me` option if using a computer with public access or that is used by more than one person.

Seller information

Sold and shipped by

Return of order


Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

  • 360Garmin Forerunner 645 Watch
  • Play videoGarmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch
  • Garmin Forerunner 645 Watch

Garmin Forerunner 645 Watch

Product description Garmin Forerunner 645 Watch

The Forerunner model is oriented to runners. Garmin has created this GPS watch to use during training for the features included, among them you can store music and play it through MP3. Like any modern phone, Garmin Pay is installed as a payment platform.

It includes several sensors: the optician measures the heart rate, the barometric and the temperature which, together with the compass, achieves exact measurements of altitude. If you want to know more information about routes, the team has the possibility to navigate them through its screen.

It supports classic connectivity through ANT +, Bluetooth and the Connect IQ platform. For cyclists and swimmers, achieve advanced metrics as well as indicators within the pool.
GPS running watch with contactless payments and wrist-based heart rate
- Includes the Garmin Pay™ Ready contactless payment method1 that lets you make convenient payments with your watch, so you can leave your cash and cards at home
- Provides advanced running dynamics2 including ground contact time balance, stride length, vertical ratio and more
- Uses wrist-based heart rate3 to offer performance monitoring features, including evaluating your current training status
- Battery life5: up to 7 days in smartwatch mode; 14 hours in GPS mode

Running is more than just exercise, it’s a performance. And Forerunner 645 has the tools to help you put on the perfect show every time you lace up your shoes. And contactless payments let you buy what you need without missing a beat. With all that plus advanced running dynamics and performance monitoring tools, this GPS running watch is the instrument you need perfect the act.

Paying made easy
Always on the run? Feel free to leave your phone and wallet behind. Forerunner 645 features the Garmin Pay Ready contactless payment method1, which lets you pay for purchases with your watch. Use it just about anywhere you can tap your card to pay. A bottle of water here, a bite to eat there — just pay, and keep on moving.

garmin pay
Tune up your training
We’re making it easier to get the data you need to improve your form. Let Forerunner 645 measure crucial running metrics2 that you can use to analyse your performance. Biomechanical measurements, such as cadence, stride length, ground contact time and balance, vertical oscillation and vertical ratio are the key to understanding your form so you can bring your best on race day. These metrics are available with the addition of a compatible heart rate strap or the compact Running Dynamics Pod, which clips right onto your waistband. Also, take advantage of feature sets to help with cycling and even swim training. In the pool, Forerunner 645 will track your distance, pace, stroke count and more.

Monitor your performance
Just how effective is your current training plan? Forerunner 645 will help you monitor your training and recovery so you can better prepare for a race or training cycle. Training status is a new performance monitoring tool that automatically evaluates your recent exercise history and performance indicators to let you know if you’re training productively, peaking or overreaching. The new anaerobic training effect metric opens a window of insight to a critical dimension of training, telling you how your training is improving your ability to push the limits. You can even view your overall training load, which measures your exercise volume from the last 7 days and compares it to the optimal range for your fitness and recent training history.

More ways to customise
Check out our Connect IQ™ store, where you can add personality to Forerunner 645 by downloading apps, widgets, watch faces and more. It’s easy and even better, it’s free. New apps are added every day, so you can keep tabs on when your Uber is arriving, turn on your lights at home with the SmartThings app, and even use the AccuWeather MinuteCast app to find out when the rain will start. With the Face It™ watch face app, choose any image from your photo library, make some tweaks, and set it as your watch’s face.

Stay connected on the run
Forerunner 645 makes it easy to run without leaving important smart features behind. Once paired with your compatible smartphone you’ll be able to receive and respond6 to text messages and see social media updates, emails and more right on your wrist. You can even use it to find your phone. And let friends LiveTrack your runs.

Share and compete
Syncing your activities to Garmin Connect is for more than just storing your data. Garmin Connect is a thriving online community where people on the go can connect and compete by joining challenges, encourage each other’s successes and even share their triumphs via social media. Garmin Connect is free and available on the web or on your smartphone with the Garmin Connect™ Mobile app.

Train your way
Your routine is anything but routine. Forerunner 645 lets you change things up with ease, thanks to built-in activity profiles for running (indoor/outdoor), cycling (indoor/outdoor), swimming (pool), elliptical, paddle sports, strength training and many more. Create your own custom workouts, and download for free from our Garmin Connect online fitness community. Then review your past efforts on the app, or share them with family and friends for added motivation.

Love the Look
Feel free to take this watch outside in all kinds of weather. Not only is it safe for swimming and showering, its Garmin Chroma Display™ is easy to read — even in direct sunlight — and housed under extra-durable Corning® Gorilla® Glass. When you want to change it up, swapping bands is fast and doesn’t require tools. The perfect everyday companion, this lightweight watch is rated to 5 ATM (50 meters) to be safe for swimming and showering. And with up to 7 days of battery life in smartwatch mode and 14 hours in GPS mode, Forerunner 645 is the running partner that can keep up with you.

Lens Material Corning® Gorilla® Glass 3
Bezel Material Stainless steel
Quick Release Bands yes (20 mm, Industry standard)
Strap material Silicone
Physical size 42.5 x 42.5 x 13.5 mm
Weight 42.2 g
Water rating 5 ATM
Display type Sunlight-visible, transflective memory-in-pixel (MIP)
Display size 1.2 (30.4 mm) diameter
Display resolution 240 x 240 pixels
Colour display
Battery life Smartwatch Mode: Up to 7 days
GPS mode: Up to 14 hours
Memory/History 200 hours of activity data

Clock Features
GPS Time Sync
Automatic daylight saving time
Alarm clock
Sunrise/sunset times

Garmin Elevate™ wrist heart rate monitor
Barometric altimeter

Daily Smart Features
Connectivity Bluetooth®, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)
Smart notifications
Text response/reject phone call with text (Android™ only)
Controls smartphone music
Find My Phone
Find My Watch
VIRB® Camera Remote
Smartphone compatibility iPhone® and Android™
Compatible with Garmin Connect™ Mobile
Garmin Pay™

Activity Tracking Features
Step counter
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)
Sleep monitoring (monitors total sleep and periods of movement or restful sleep)
Calories burned
Floors climbed
Distance traveled
Intensity minutes
Move IQ™
Fitness Age yes (in app)

Fitness Equipment/Gym
Preloaded gym activity profiles Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga
Cardio workouts
Strength workouts
Automatic rep counting

Training, Planning and Analysis Features
GPS speed and distance
Customisable screen(s)
Customisable activity profiles
Auto Pause®
Interval training
Advanced workouts
Downloadable training plans
Auto Lap®
Manual lap
Configurable lap alerts
V02 max
Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.)
Training Load (your total training load for the last 7 days calculated from estimated EPOC)
Training Effect (aerobic)
Training Effect (anaerobic)
Customisable alerts
Audio prompts
Finish time
Virtual Partner
Race an Activity
Course guidance
Segments (Live, Garmin)
Strava features (Beacon, live segments)
Touch and/or button lock
Auto scroll
Activity history on watch

Heart Rate Features
HR zones
HR alerts
HR calories
% HR max
Recovery time
Auto max HR
HR Broadcast (broadcasts HR data over ANT+™ to paired devices)

Running Features
Preloaded run profiles yes (Running, Treadmill Running, Indoor Track)
GPS-based distance, time and pace
Running dynamics
Cadence (provides real-time number of steps per minute)
Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level)
Run workouts
Race predictor
Foot pod capable

Outdoor Recreation Features
Preloaded outdoor recreation profiles Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Point-to-point navigation
Bread crumb trail in real time
Back to start
UltraTrac mode
Elevation profile
Distance to destination
Vertical speed
Total ascent/descent
GPS coordinates

Cycling Features
Preloaded cycling profiles Biking, Indoor Biking
Race an activity
Time/distance alerts (triggers alarm when you reach goal)
Compatible with Varia Vision™ (head-mounted display)
Compatible with Varia™ radar (rear-facing radar)
Compatible with Varia™ lights
Speed and cadence sensor support (with sensor) yes (ANT+® and Bluetooth® Smart)

Swimming Features
Preloaded swim profiles Pool Swimming
Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)
Stroke type detection (freestyle, backstroke, breaststroke, butterfly)
Swim efficiency (SWOLF)
Drill logging
Pool swim workouts

Forerunner 645
Charging cable

If you are interested in Garmin Forerunner 645 Watch, discover also other running and triathlon products related to Garmin in the Electronics department and Watches catalogue. In addition, when buying at runnerinn, your online running and triathlon store, you join the biggest sports community, where you can find opinions, product reviews, and the best offers that you are interested in.

Customer reviews and questions (13)

Write a review about this product and earn CoINNs (existing customers only) coinns

Write a review and earn CoINNs

(existing customers only)

100% original


Hello everyone, Merry Christmas. Thank you to trekkinn and its employees for their sensitivity to customer satisfaction-oriented work we are grateful for the best price guarantee they offer us for the most original Product Guarantee We are grateful to Trekkinn for a very successful Site almost all over the world when I deliver my orders from Turkey 10. Thank you, Trekkinn ...

Excellent multi-sport monitoring device.


After a long search and a tiring comparison of sports watches, I end up at 645, deciding it was the best for me. Excellent for monitoring sports metrics as well as daily monitoring of one's condition. The version without music is just great (I never needed music on a device like this). Despite being an exclusive watch dedicated to runners it allows a vast monitoring of other sports. Already with barometric altimeter and other important specifications, for me is one of the best watches I could buy. Nothing is behind Garmin's top of the line.

Very good


I am very pleased with the clock, version without music. The battery lasts a long time; satellite in just seconds and synchronization with the mobile phone / PC is extremely simple. The ordering and delivery process went smoothly.



The product arrived on time and everything was perfect.

Garmin forerunner 645 + runnerinn


Fantastic product, in great condition and the service of the runnerinn too. I recommend!

Garmin 645


The ordering and delivery process was very fast and able to control where the order was. Excellent service

Garmin forerunner 645 and runner inn


original product. arrived in its package. packaging in this way. Arrived intact. excellent company. communication and after-sales assistance. I would definitely recommend it

Garmin forerunner 645, good choice.


Good choice sports watch. Great for running, cycling and swimming (also in the pool!). He is accurate, has beautiful design that does not go wrong in daily use. Further accurate, good connection with connect app and strave. Recommended!



Hello, The language can be configured in English. thank you for your reply

our experts answer

Yes, you can set up english as default language from the device. Regards.

French idioma


está versión s'puede poner in French idioma?

our experts answer

Yes, it is compatible with French language. Regards.

All perfect, although the optical heart rate monitor is very gentle


It's the version without music, which does not sell as much, but it's 50 € cheaper and it's perfect for those of us who listen to streaming music; So we do not have to pay for a feature we do not use. The battery lasts 3 or 4 days connected 24h by bluetooth, with the heart rate monitor, receiving notifications, consulting it, with backlight, using time and training every day. The bracelet that comes standard is a little flexible, which goes well to fit comfortably to the wrist, but now in summer with the heat to some it causes a bit of stinging if we wear it day and night. The only negative is that the optical heart rate monitor, despite being one of the best, is very delicate, because if it goes too tight it obviously does not mark well, and if it goes too tight it does not mark the pulsations well either. It is a bit delayed (you start a series of training and it shows you that you have raised heartbeats at 20 seconds or so). Therefore it is necessary to find the point of tightening-loosening the wrist strap, so that we can mark the pulsations well. It is clear that if you want accuracy and reliability: chest heart rate monitor, despite its contras to the optical.



Good morning my question is this: this version can be put in Spanish language ???

our experts answer

Yes, you can set up this device to spanish. Regards.



Dear The product is the version with or without music? Greetings

our experts answer

This is the version without Music. You could get the device with music features here: https://www.runnerinn.com/running/garmin-forerunner-645-music/136784493/p Regards.

Write a review or ask our dedicated team of experts a question

Product rating

Note: your review will be reviewed by our staff and posted within 5 working days. Your question will be answered by email, so please make sure your email address is correct.

I accept your Privacy Policy

clouse menu Close
up up