Best Heart Rate Monitors (2025), WIRED Tested and Reviewed
Runner-Up
Best Garmin Chest Strap
Best Armband
We tested and recommend all of the heart rate monitors below, which do a pretty impeccable job. But what does this data mean?
Heart rate zones: If someone tells you they’ve been doing 80/20 training, they’ve been doing heart rate zone-based workouts. Heart rate zones are an easy way to break down your range of effort during exercise. Zones go from 1 to 5, with 5 indicating working at 90 to 100 percent of your maximum heart rate. Zone 2 represents training at 60 to 70 percent of maximum heart rate and represents light training. 80/20 training is intended to build endurance and means that 80 percent of your runs should be in Zone 2. If your heart rate monitor doesn’t tell you your zone, you can calculate it using Polar’s simple tool.
Maximum heart rate: Some monitors can inform you of your maximum heart rate, which is the number of beats your heart can reach during exercise. This is useful for knowing when you’re training at peak intensity and can be used to create heart rate zones. Factors like your age and fitness level can influence what that maximum heart rate will be. You can generate an estimate of your maximum heart rate by simply subtracting your age from 220 and use that at a starting point.
VO2 max: The term VO2 max stands for maximum rate of oxygen your body can consume during exercise; the higher the better. It provides a useful indicator of your ability to sustain intense effort for long periods. Calculating this accurately is done in lab conditions, so heart rate monitors and watches often use their own algorithms to approximate that lab testing.
Heart rate variability: Heart rate variability measures the intervals between heart beats and is measured in milliseconds. High HRV readings are considered better than lower ones, because it means that the body is responding in a resilient way to stress. However, your HRV readings can differ widely from one person to another because they can be influenced by age, fitness level, or even when the measurement was taken.
Resting heart rate: This is the number of times your heart beats in one minute when at rest, which is a simple indicator of your current level of cardiovascular fitness and general well-being. Typically, your heart rate is supposed to sit anywhere from 60 to 100 bpm at rest. A low resting heart rate is associated with athletes, because the heart has been trained to be more efficient. But an uncharacteristically low or high RHR could mean that something is not quite right.
Calories burned: A heart rate monitor looks at your effort based on your heart rate and uses the company’s own algorithms to offer an indicator of how many calories you’ve burned during a workout. Heart rate is one of the strongest, if not the strongest indicators of effort, which means a heart rate monitor is one of the most accurate ways to get this information.
How to Wear a Heart Rate Monitor
Based on those factors above, what kind of information do you need to see? Figuring this out will help you get a heart rate monitor that not only delivers wearability, accuracy, and value, but ensures that you strap it to the ideal part of your body.
Wearing one on the wrist, as part of a smartwatch, may be the most convenient way to track heart rate, though a strap—typically on the chest or, more recently, the upper arm or bicep—can generate more accurate data for activities like exercise.
If you want to track heart rate during sleep, make sure you opt for a form factor that isn’t going to feel bulky or become a nuisance for your sleeping companion. If you’re hoping to use it with other fitness equipment or a watch, look for the type of Bluetooth and ANT+ connectivity support to do that with single or multiple devices.
How We Tested
These heart rate monitors are predominantly designed to track your heart during exercise, so that’s how I focused our testing. I used them for a range of indoor and outdoor workouts, including runs, indoor bike rides, rowing, and HIIT-style sessions to see how the monitors fare when it has to track sudden spikes and drops in heart rate.
I also mixed up the duration of those workouts, going from 20 to 30 minute sessions to one hour or longer, to see how the battery performed, particularly for those with rechargeable battery setups. For those that offer a mix of exercise-based and continuous monitoring, I’ve used those monitors alongside other strong-performing HR trackers, to check the accuracy and compare medical-grade heart rate sensors to blood pressure monitors and pulse oximeters that also promise accurate on-the-spot readings.
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Best All-Round
A chest strap remains the most accurate way to track your heart rate for exercise, putting an EKG sensor closest to your heart. The Polar H10 is the standout here. That’s because Polar has replaced the typical loop-and-hook connector found on most monitors with a buckle-style connector to reduce irritation. The company also uses small silicone dots to make sure the strap stays put during high-intensity activities so the HR data is still good.
Comfort aside, it’s the most accurate of the monitors I’ve tested for exercise. There were no glaring drop-outs or underreporting or overreporting during my test runs, indoor cycles, strength training, or interval sessions. Having some built-in memory to store data for a session is useful, and the ANT+ connectivity means you can effortlessly link equipment like turbo trainers or swap out the HR stats on your watch for more accurate ones. You can take it for a swim too, and you won’t have to replace the battery for a year, even if you’re wearing it on a regular basis. If you’d like to save a few bucks, the previous Polar H9 ($70) offers many of the same features for about $30 less.
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Runner-Up
If a chest strap is out of the question because you need to see your metrics in real time and glance at them during the day, the Forerunner 265 is a multisport watch that can deliver reliable heart rate metrics during workouts, and even when you head to bed.
The headline change from the previous 255 is the addition of a vibrant AMOLED touchscreen display inside a 42-mm or 46-mm case, which holds Garmin’s Elevate optical heart rate sensor. That delivers continuous heart rate data by the second and does so reliably. During runs and indoor workouts, the sensor holds up well at high intensity, with the support to pair to external heart rate monitors if want to go pro. That optical sensor also brings other useful measurements, like heart rate variability (HRV), which fuels useful features such as Training Readiness. This uses HRV, along with other metrics, to provide a clear sense of whether you should go hard or give your body a rest day.
Traditionally Garmin heart rate monitors were complicated and expensive, but that all changed with the launch of the affordable but accurate HRM-200. It comes in two strap sizes, which can be thrown in the wash (minus the sensor) and features a hook clasp that keeps it securely in place. Unlike other Garmin monitors, there’s an LED indicator on the EKG sensor module making it easier to see when it’s successfully paired and transmitting your data.
You can connect it to up to three Bluetooth devices and technically unlimited options using ANT+. Whether you’re pairing it with a Garmin watch or a connected piece of gym equipment that supports heart rate tracking, the HRM-200 delivers where it matters and can handle monitoring slow, long runs or interval-style rides with zero fuss. It uses a standard CR2032 watch battery and, impressively, can last up to a year, though that depends on how much you use it. I like the fact that if you also use a Garmin watch or bike computer, you can also track the battery life.
Best Armband
Heart rate monitoring armbands are the new kid in town here, and while the Coros Heart Rate isn’t the most feature-packed option, it has the most likable design in terms of everyday comfort. You’re also much less likely to misplace the Coros compared to other armband monitors.
Coros pairs up a not-too-dainty, five-LED light-packing sensor with a Velcro strap that has a welcome stretch to it due to a mix of polyester, nylon, and Spandex. It’s just Bluetooth connectivity here, so no love for ANT+ fans, but this monitor can connect to sports watches, connected gym equipment, and indoor trainers, so don’t sweat it. We’ve found that on runs, indoor rides, and high-intensity workouts, this monitor was typically 1-3 BPM out from a heart rate monitor chest strap—so it’s up to you whether that’s a trade-off between practicality and accuracy that makes sense. It lacks the storage capacity you get with rival HR armbands like the Polar Verity Sense ($105), though it does have a useful notification light to let you know when you’ve maxed out on the 38 hours of battery it can muster up on a single charge.
Despite rumors that Apple would add heart rate tracking to the AirPods, it was the Beats Powerbeats Pro 2 that enjoyed a biometric boost. They’re by no means perfect, but they do perform miles better than any previous heart-rate-tracking earbuds, and could hopefully be a sign of what’s to come for Apple’s white buds.
Apple and Beats do things differently by adding optical PPG sensors in both earbuds that are 1/16th the size of the ones included inside of an Apple Watch. They work with both Android and iOS devices, though it’s surprisingly a more restricted experience with the latter, as they only work with a few select apps. But they offer better heart rate tracking than any other headphones I’ve tested, although they aren’t infallible when you up the intensity of your workout. Add in new active noise cancellation tech, improved overall sound quality, and a slimmer, more refined ear hook design, and these are excellent workout buds that come with the added bonus of solid heart rate monitoring skills.
Best Smart Ring
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The Oura Ring 4 remains the smart ring to beat for a host of reasons. It looks great, the companion app is more polished than those of its rivals, and now it’s better equipped to track your heart and make its insights all that more insightful.
Oura has upgraded its optical sensor platform by opening up signal pathways to boost overall tracking accuracy. It’s now also better at monitoring data on different finger shapes and skin tones, and, crucially, when your ring moves around during the day and night. It leads to noticeably more reliable daily and sleep heart rate data. This powers its key Readiness metric, which tells you whether you’re in good shape to take on a stressful day or you should maybe have a chilled one. It also means new features like Oura’s Symptom Radar can actually understand when you’re not feeling great.
Recording heart rate during exercise is better too, though it still doesn’t match what you get from the gold standard in monitoring. The improvements are enough, though, to make Oura’s latest ring the best pick if you prefer to wear a heart rate monitor on your finger.
Note: The Whoop 5.0 has just launched. We will update this review once we’ve tested it.
The Whoop has emerged as the go-to wearable if you’re keen on tracking health metrics but don’t want a smartwatch or a smart ring. The Whoop is a screenless tracker that hides its optical sensor technology behind a host of stylish straps, giving it fashion rather than fitness vibes. It is designed to never be taken off—to better track and understand your body’s needs—and as such, can be worn in the shower or for a swim. To charge, you simply clip on a wireless battery pack, which means not a single heart beat is missed.
Whoop’s core principles of tracking recovery, strain, and sleep are heavily rooted in its ability to accurately track your heart rate. Whoop acknowledges that heart rate positioning is key, so it offers a range of straps and clothing. Move it to your bicep with the additional bicep strap to get the best heart rate accuracy for high intensity workouts like HIIT classes. Leave it on the wrist for more stationary workouts and when you’re taking it to bed. You even have the option to pop the tracker out and wear it in your underwear.
It is also one of the best sleep trackers in the business. The app is extremely comprehensive, and while it can’t quite replace a sports watch, the Whoop will reliably capture your heart rate variability measurements and help you better understand the importance of effort and recovery. Just be prepared to pay the pricey subscription fee to make the most of it.
Best Smart Watch for Heart Rate Tracking
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While some still dispute it, the Apple Watch remains the standout smartwatch. Part of its appeal is its ability to deliver a more compelling level of accuracy and insight from its sensors. The result is a watch that makes a fine training companion and also a potentially life-saving wearable.
The Apple Watch Series 10 offers standout heart rate monitoring whether you’re keeping a close eye on your health or want a better idea of just how hard you pushed during a lung-busting workout. Apple uses the same optical heart rate sensor technology found inside the Watch Series 9. That’s joined by an EKG sensor that’s designed to offer similar tracking to a single-lead electrocardiogram and is primarily used for Apple’s regulatory-approved atrial fibrillation detection mode.
The primary optical sensor offers the most accurate daily and workout heart rate data I’ve seen on a smartwatch, and by some distance. If you’re not satisfied with what it delivers during exercise, it’s a breeze to pair it to an external Bluetooth heart rate monitor instead. Besides Apple’s own Health and Fitness apps, there are a host of third-party apps that can display Apple’s heart rate data on a larger screen and delve deeper into your stress or sleep, or make the Series 10 an even more insightful training partner.
While it’s tough to know where the future lies for Fitbit’s smartwatches, the Charge 6, its flagship fitness tracker, strengthens its monitoring powers, notably in the heart rate tracking department.
It relies on a similar optical sensor setup to the Charge 5, reliably delivering metrics like resting heart rate. It also dips into heart rate variability to estimate when you’re feeling stressed. In the exercise-tracking realm, that sensor performed better for workouts, with Fitbit delivering on that promised 60 percent improved accuracy compared to the Charge 5. That’s across stationary sessions like indoor rows and HIIT sessions, and when putting the not-so-fantastic built-in GPS to outdoor use. However, it does still occasionally have its moments throwing up wildly high average and maximum readings. Now you can make the most of that (mostly) reliable tracking and transmit it to connected gym equipment like rowers and treadmills. An EKG sensor gives the Charge 6 the power to assess your heart rate rhythm for atrial fibrillation, bringing in a health feature typically reserved for more expensive smartwatches.
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