Forerunner 645 - Black

The Why

Train more effectively
Battery lasts up to 7 days
Connects to your smartphone

$399.99

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Product Videos:

Forerunner 645/645 Music: Getting the Most Out of Your Device
Forerunner 645/645 Music: How to Use Garmin Pay

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Running is more than just exercise — it’s a performance. And Forerunner 645 has the tools to help you put on an outstanding show every time you lace up your shoes. Featuring contactless payments that let you buy what you need while on the go — plus advanced running dynamics and performance monitoring tools — this GPS running watch is the instrument you need to refine the performance.

Paying Made Easy

Always on the run? Feel free to leave your phone and wallet behind. Forerunner 645 features Garmin Pay contactless payment solution, 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.

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 metrics that you can use to analyze 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 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 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 Customize

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 even respond6 to text messages and see social media updates, emails and more right on your wrist. Find your phone, access music controls, 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

Designed for runners, Forerunner 645 features a reliable five-button interface that lets you mark laps with a quick press. 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 chemically strengthened glass. When you want to change it up, swapping bands is fast and doesn’t require tools. 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.

A Better Way to Burn Fat

If your weight-loss efforts seem stalled or stymied, heart-rate-based interval training may provide just the metabolic boost you need. It’s not fair, you say: You’re eating right and you’re working out for hours every week, yet your unwanted fat is barely fazed – in fact, it’s just plain ignoring you. What gives? Well, it could be that you haven’t yet trained your body to burn fat efficiently. Or it could be that you’ve adapted to your current program and, as a result, you’re burning fewer calories than you were a few months ago. Either way, stalled weight loss can be frustrating, but here’s the good news: Using strategic heart-rate training, you can drop those stubborn pounds. Click here to learn a better way to burn fat.

Steady-State Cardio Vs. High-Intensity Interval Training

The best system of cardiovascular training probably isn’t the all-or-nothing approach. Rather, it’s a blend of both higher and lower-intensity cardiovascular training that’s tailored to your body and your goals. Click here to discover why a blend of both high- and low-intensity exercise is the best system of cardiovascular training.

Three heart-rate-based workouts that help you lose weight smarter and faster.

At some point in your fat-burning endeavors, you’ve probably been directed to take your pulse for a few seconds, then multiply that number to get your beats per minute. Perhaps you’ve grabbed the sensors on a treadmill to find out how hard you’re working — or just out of pure curiosity. And when you do, do you ever wonder: What’s the point? Can knowing your heart rate really help you reach your weight-loss goals? If you’re trying to drop unwanted pounds, not win a triathlon, does all that heart-rate stuff really matter? Wonder no more: The answer is yes. It turns out that a fitness-by-numbers approach can churn out remarkable weight-loss results. It helps you upgrade your fitness, too, of course. But even if you don’t give a fig about fitness, heart-rate training is still a fat-blaster’s best friend. Monitoring your heart rate helps you avoid the common mistake of always training in the same “gray zone” of intensity, says Troy Jacobson, head endurance sports coach at Life Time Fitness in Chanhassen, Minn. And that means you avoid wasting time and energy on workouts that don’t deliver the results you’re after. “Heart-rate training allows you to precisely control the intensity of your workouts to ensure you get the benefits you’re seeking — including fat loss.” For more information on how to get started, click here.

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