Running Watches
The right watch turns indoor miles into proper training data. We have researched and compared the leading running watches for treadmill and indoor use, from a 36 gram budget pick to a full ultra-and-trail flagship, and scored each on our RunRank system.
- Tracking 4.5
- Battery 4.5
- Features 4.0
- Tracking 4.5
- Battery 4.5
- Features 4.5
- Tracking 4.5
- Battery 4.0
- Features 4.5
- Tracking 4.5
- Battery 4.5
- Features 4.5
- Tracking 5.0
- Battery 5.0
- Features 4.5
- Tracking 4.0
- Battery 2.5
- Features 4.0
- Tracking 5.0
- Battery 5.0
- Features 5.0
Prices checked regularly and change with sales. We may earn a commission, at no extra cost to you.
Tracking a treadmill run is not quite the same as tracking an outdoor one. Indoors there is no GPS signal to lock onto, so every watch falls back to the motion sensor on your wrist to estimate pace and distance. That makes two things matter more than the spec sheet suggests: how well the watch reads your arm swing, and whether it lets you calibrate against a known distance so the numbers tighten up over time. We cover how that works further down, but it shapes every pick below.
Our list leans towards Suunto, whose recent run-focused models are some of the best value in the category, but it is a genuine multi-brand guide. Garmin, Apple and Coros all earn a place, because the best watch for you depends on your budget, your wrist and whether you also run outdoors.
The quick picks
RunRank at a glance
Our RunRank score rates each watch out of five across four pillars built for running watches: Tracking and Accuracy, Battery, Running Features and Value. The overall is our weighted view, not a flat average.
| Watch | Tracking | Battery | Features | Value | RunRank |
|---|---|---|---|---|---|
| Suunto Run | 4.5 | 4.5 | 4.0 | 5.0 | 4.6 |
| Coros Pace 4 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| Garmin Forerunner 165 | 4.5 | 4.0 | 4.5 | 4.0 | 4.4 |
| Suunto Race S | 4.5 | 4.5 | 4.5 | 4.0 | 4.5 |
| Suunto Race 2 | 5.0 | 5.0 | 4.5 | 3.5 | 4.6 |
| Apple Watch SE | 4.0 | 2.5 | 4.0 | 3.5 | 3.5 |
| Suunto Vertical 2 | 5.0 | 5.0 | 5.0 | 3.0 | 4.5 |
The watches in detail
Suunto Run
around £199
The Run is Suunto’s entry-level, run-first watch, and it is the one we would put on most treadmill users. At just 36 grams it disappears on the wrist, the AMOLED screen is bright and easy to read mid-session, and it strips back the outdoor-expedition extras to focus on what runners actually use. Battery runs up to around 12 days in daily use and roughly 20 hours in dual-band GPS training, so charging is rarely on your mind.
For indoor work the highlight is Ghost Runner, which lets you race a set pace, a neat way to hold a target on a treadmill. Interval tools, cadence, heart rate and a metronome round it out. At this price, nothing else here gives you a dedicated running watch this light and this focused.
- Featherweight 36 g build
- Ghost Runner is ideal for holding treadmill pace
- Excellent battery for the price
- No offline maps
- Fewer multisport extras than the Race line
Coros Pace 4
£229.99
The newest watch in Coros’s popular Pace line, the Pace 4 is a lightweight, race-ready all-rounder that has quickly built a strong reputation among runners. You get accurate tracking, the full Coros training platform and the long battery life the brand is known for, in a watch that stays comfortable across long sessions. If you like the Coros ecosystem and want a light, current running watch with proper training depth, this is the pick.
It sits right alongside the Suunto Run on price, so the choice often comes down to ecosystem: Coros for its training analytics, Suunto for its lightness and Ghost Runner pacing.
- Newest Coros Pace, light and comfortable
- Strong battery and accurate tracking
- Full Coros training platform
- Coros app is less mainstream than Garmin
- Fewer third-party integrations than Garmin
Garmin Forerunner 165
around £249
If you arrive set on Garmin, the Forerunner 165 is the sensible starting point. It brings a crisp AMOLED display, dependable GPS and the deep, well-established Garmin Connect ecosystem, with training readiness, suggested workouts and one of the largest third-party app libraries going. For treadmill use the running dynamics and pace guidance are first class once calibrated.
- Best-in-class app and data ecosystem
- Reliable tracking and pace guidance
- Bright AMOLED screen
- Shorter battery than the Suunto and Coros picks
- Music version costs more
Suunto Race S
around £345
The Race S takes the well-reviewed Suunto Race formula and shrinks it into a smaller, lighter case that suits slimmer wrists. You keep the bright AMOLED touchscreen, the genuinely useful digital crown, 95-plus sport modes and strong battery life, plus training load and recovery insights from heart rate variability. It is the natural upgrade from the Run for those who want a more capable all-rounder without going to flagship size.
- Compact, lighter Race in a smaller case
- Digital crown and bright AMOLED
- Deep training and recovery metrics
- Pricier than the entry options
- No offline music
Suunto Race 2
from £429
The 2026 Race 2 is Suunto’s strongest sports watch in years and a real Garmin alternative. Reviewers single out its excellent battery life behind a bright AMOLED, solid GPS accuracy and a strong suite of training insights. It comes in one 49 mm case with a wallet-friendly stainless steel option and a premium titanium one. For committed runners who want a watch to grow into, this is the pick.
- Outstanding battery and bright AMOLED
- Accurate dual-band tracking
- Steel option keeps the price sensible
- One large 49 mm case only
- No offline music
Apple Watch SE
price varies
If you live in the Apple world and treadmill sessions are part of a broader fitness routine rather than serious mileage, the SE makes sense. Workout tracking is solid, the smart features are unmatched, and GymKit lets it pair directly with compatible gym treadmills for more accurate distance and calories. The catch is battery: roughly a day between charges, so it is a smartwatch that runs rather than a running watch.
- GymKit pairs with compatible treadmills
- Best smart features and notifications
- Seamless for iPhone owners
- About a day of battery
- Not built for long or back-to-back sessions
Suunto Vertical 2
around £699
For anyone whose treadmill base-building feeds into ultras or big days in the hills, the Vertical 2 is the expedition flagship. It pairs a large, very bright 1.5 inch AMOLED with dual-band GNSS, offline topographic maps, a built-in flashlight and some of the longest battery life of any full-colour outdoor watch. Overkill for indoor-only use, but unbeatable if your training stretches well beyond the treadmill.
- Class-leading battery and offline maps
- Huge, bright AMOLED with a flashlight
- Rugged, expedition-ready build
- Expensive and large
- Far more watch than indoor running needs
Also worth knowing: Decathlon sells the slightly cheaper Coros Pace 3 and the AMOLED Coros Pace Pro direct as well, if you want a different price point or a brighter screen.
How watches track treadmill running
This is the part most roundups skip, and it is the bit that actually decides how happy you will be indoors.
No GPS indoors. A treadmill keeps you in one spot, so the satellites that fix your position outdoors are no help. Instead the watch uses its built-in accelerometer to read your arm swing and estimate stride length, pace and distance. Every watch on this list does this, so a watch that is accurate outdoors is not automatically accurate on a belt.
Calibration is what tightens the numbers. The more you run outdoors with GPS on, the better the watch learns your stride, and that learning carries over to indoor runs. You can also correct distance manually: at the end of a treadmill run, adjust the recorded distance to match the treadmill’s own readout, and most watches will use that to calibrate future sessions. Do this two or three times and indoor accuracy improves noticeably.
Two shortcuts worth knowing. Suunto’s Ghost Runner lets you set and hold a target pace, which pairs neatly with a treadmill’s fixed speed. And Apple’s GymKit connects the watch directly to compatible gym treadmills, taking distance and speed straight from the machine rather than estimating it, which is the most accurate option of all if your treadmill supports it.
How to choose
Lightest, most affordable and treadmill-focused: the Suunto Run at around £199.
Best all-round value and the Coros ecosystem: the Coros Pace 4 at £229.99.
You also swim or cycle: the Suunto Race S adds proper multisport depth.
Serious training, want room to grow: the Suunto Race 2 or a Garmin Forerunner 165.
Ultras and trail beyond the treadmill: the Suunto Vertical 2.
Frequently asked questions
Does a running watch work on a treadmill?
Yes. Without GPS it switches to the wrist accelerometer to estimate pace and distance. Accuracy is good once the watch has learned your stride, and better still if you calibrate it against the treadmill’s distance readout.
How do I connect an Apple Watch to a treadmill?
Start an Indoor Run workout on the watch, then hold it near the treadmill’s GymKit contactless pad if the machine supports it. The watch and treadmill pair automatically and share data, giving you more accurate distance and calories than estimation alone.
Why is my watch distance different from the treadmill?
The two measure differently: the treadmill counts belt movement, the watch estimates from your arm swing. Calibrating the watch to the treadmill’s distance a few times brings them much closer together.
Do I need GPS at all if I only run indoors?
Not for the run itself, but a watch that also has GPS will learn your stride faster whenever you do run outdoors, which improves its indoor accuracy. It also future-proofs you for outdoor sessions.
Which is the best value running watch here?
The Suunto Run at around £199 for the best balance of weight, battery and run-specific features, and the Coros Pace 4 if you want the Coros training ecosystem for a little more.
The verdict
For most people putting in treadmill and indoor miles, the Suunto Run is the watch to beat: light, focused, long-lasting and keenly priced. If you want the Coros ecosystem the Coros Pace 4 is the value pick, and runners who want more depth should look at the Suunto Race S or Race 2. Apple and Garmin remain the right call for their own ecosystems. Whichever you choose, calibrate it against your treadmill early and the numbers will look after themselves.
We research and compare products independently. If you buy through links on this page we may earn a commission, at no extra cost to you. Prices are guide figures and change with sales, so always check the current price on the retailer’s site.
