You’ve been running in your old trainers with your phone strapped to your arm in one of those neoprene sleeves, and it’s driving you mad. The sleeve slips, the phone bounces, and Strava eats your battery before you’ve finished a 10K. You want a proper running watch, but you’ve seen that Garmin Forerunner 265 for £290 and thought “completely not — I just want to know my pace and distance.”
Good news: you don’t need to spend anything close to that. Whether you’re following a Couch to 5K programme or training for your first half marathon, these watches do the job. There are genuinely excellent running watches under £100 that’ll track your runs accurately, monitor your heart rate, and last the week on a single charge. Some of them are so good that spending more only gets you features most recreational runners never use.
Here are the best options available in the UK right now, tested against what actually matters for runners.
What to Look For in a Budget Running Watch
Before the specific picks, a quick word on what separates a good budget running watch from a bad one. These are the features that matter at this price point:
- GPS accuracy — The whole point. If the watch says you ran 5K but you actually ran 4.7K, it’s useless for training. Budget watches have caught up enormously here, but some are still ropey in cities with tall buildings or on tree-covered trails.
- Optical heart rate (wrist-based) — Every watch on this list has it. Wrist HR is good enough for zone training and general fitness monitoring. It’s not as precise as a chest strap, especially during intervals, but for steady runs and easy pace work, it’s perfectly fine.
- Battery life — You want at least 10 hours of GPS tracking. Anything less and you’ll be anxious on long runs or if you forget to charge before a half marathon.
- Water resistance — Look for 5 ATM (50 metres) minimum. That handles rain, puddles, sweat, and accidental submersion. Not rated for actual swimming unless it specifically says so.
- Comfort and weight — You’re wearing this for hours. A heavy, bulky watch that digs into your wrist on long runs is no good regardless of features.
1. Garmin Forerunner 55 — The Reliable All-Rounder
Price: About £90-100 (often discounted to £80)
The Forerunner 55 has been around for a while now, and Garmin keeps it in the range for good reason — it’s the watch Garmin designed for exactly this market, and the one we’d recommend to anyone who asks “what running watch should I get?” without specifying a budget.
GPS accuracy is excellent. Garmin’s GPS chipset locks on quickly (usually under 30 seconds outdoors) and tracks consistently. On a measured parkrun course, it’ll be within 1-2% of the actual distance, which is as good as watches costing three times more.
The heart rate sensor is Garmin’s Elevate V3, which handles steady-state running well. It can lag during sharp interval changes — sprinting from zone 2 to zone 5 and back — but for tempo runs, easy miles, and long runs, it’s reliable.
Battery life is about 20 hours with GPS on, which is enough for an ultra let alone your weekend long run. In smartwatch mode (no GPS), it’ll last about two weeks.
What makes the Forerunner 55 special at this price is Garmin Connect. The app and ecosystem are the best in the business. Training plans, recovery advice, VO2 max estimates, race predictions — all included, no subscription needed. Strava syncs automatically.
The catch: No music storage, no maps, and the screen is a basic colour display rather than AMOLED. You’re getting a purpose-built running tool, not a smartwatch. For running, that’s actually a strength — fewer distractions, better battery life.
Where to buy: Amazon UK, Argos, Currys, John Lewis, and Sports Direct all carry it. Check Amazon and Argos first — they frequently discount it below £90.
2. Coros Pace 2 — Lightest GPS Watch You Can Buy
Price: About £85-100 (nylon strap version is cheaper)
The Coros Pace 2 weighs just 29 grams with the nylon strap. Twenty-nine grams. You really forget it’s on your wrist, which is a revelation if you’ve been running with a phone or a heavier watch.
GPS performance is on par with the Garmin. Coros uses a decent chipset that handles urban canyons and tree cover better than you’d expect at this price. It supports GPS, GLONASS, and BeiDou satellites, so you’ve got plenty of positioning sources.
Battery life is the headline feature alongside the weight: up to 30 hours with GPS on. That’s exceptional. You could run a 100-mile ultra and the battery would outlast your legs. For most runners, it means charging once a week or less.
The heart rate sensor is adequate but not best-in-class. It’s fine for steady running but loses accuracy during high-intensity intervals more than the Garmin does. If you do a lot of track sessions or HIIT, you might want to pair a chest strap (the Coros pairs easily with Bluetooth HR monitors).
Coros’s app has improved massively over the past couple of years. Training plans, structured workouts, and the training load tracking are all solid. The interface isn’t as polished as Garmin Connect, but the data is there.
The catch: The screen is a simple greyscale display — no colour, no touchscreen. Navigation is via a rotating dial and a back button, which works well with gloves on but feels basic compared to the Garmin. The watch also looks a bit sporty for everyday wear if you care about aesthetics.
Where to buy: Direct from Coros UK website, Amazon UK, Wiggle, and Sigma Sports. The nylon strap version (lighter, about £85) is the one to get for running — the silicone strap version costs a few quid more and is heavier.
3. Amazfit GTS 4 Mini — Best for Everyday Wear
Price: About £70-85
If you want a watch that looks like a normal smartwatch rather than a chunky sports device, the GTS 4 Mini is the one. It has a rectangular AMOLED display that’s bright, sharp, and easy to read even in direct sunlight. It looks more like an Apple Watch than a running computer.
For running, it does the job well. GPS accuracy is good — not quite Garmin-level consistent, but within 2-3% on most runs, which is acceptable for training purposes. It uses a dual-band GPS system that helps in built-up areas. Heart rate monitoring is solid for a watch at this price.
Battery life is about 15 hours with GPS on, which covers any run up to an ultra marathon. In regular smartwatch mode, Amazfit claims 15 days, and real-world use gets you about 8-10 days depending on notification frequency.
The GTS 4 Mini also has decent smartwatch features: phone notifications, music control, weather, and Alexa built in. If you want one device for running and daily life, it’s an appealing package.
The catch: The Zepp app (Amazfit’s companion app) isn’t as good as Garmin Connect or Coros for serious running analysis. It does the basics — distance, pace, heart rate zones — but training load, recovery metrics, and race predictions are less detailed. Strava sync works, which is what matters for most people. Pair it with the right pair of shoes and you’re set.
The water resistance is 5 ATM, so rain and sweat are fine, but Amazfit doesn’t recommend swimming with it.
Where to buy: Amazon UK is the easiest option. Argos sometimes stocks it. Direct from the Amazfit UK store is another option, and they occasionally run sales that bring it under £70.
4. Garmin Forerunner 165 — The Stretch Pick
Price: About £95-110 (sometimes dips under £100 on sale)
I’m including this because it frequently drops below £100 during sales at Amazon, Currys, and John Lewis, and it’s a significant step up from the Forerunner 55.
The big upgrade is the AMOLED touchscreen. The display is vivid and responsive — a genuine pleasure to use compared to the muted screens on the 55 and Coros Pace 2. It also adds multi-band GPS (more accurate in cities and under trees), a newer heart rate sensor, and training readiness scores.
If you can find it under £100, it’s the best running watch on this list full stop. If it’s £110-120, it’s still worth the stretch over the Forerunner 55 for the screen alone — squinting at a dim display mid-run when you’re breathing hard gets old fast. We ran with each watch for at least 50 miles before forming our final opinions.
Battery life takes a hit from the AMOLED screen: about 17 hours with GPS, which is still plenty for any run you’re likely to do.
The catch: At full price (£220 RRP), it’s a completely different conversation. It only makes this list because retailers frequently discount it. If you don’t see it under or near £100, go for the Forerunner 55 or Coros Pace 2 instead.
Where to buy: Watch Amazon UK, John Lewis, and Currys price trackers. CamelCamelCamel is your friend here — set a price alert for £100 and wait.
5. Polar Pacer — The Underrated Option
Price: About £85-100
Polar has been making heart rate monitors and sports watches since the 1980s, but they’ve lost mindshare to Garmin and Apple in recent years. That’s a shame because the Pacer is a cracking watch for the money.
GPS accuracy is very good — Polar’s chipset is reliable and consistent. Heart rate monitoring is where Polar has always excelled; the Precision Prime sensor on the Pacer handles intervals better than most wrist-based sensors at this price.
The standout feature is Polar’s training ecosystem. Their Training Load Pro system tracks cardio load, perceived effort, and recovery balance. The Polar Flow app shows you whether you’re training enough, too much, or not enough — and it’s been doing this longer and arguably better than Garmin’s equivalent.
Battery life is about 35 hours with GPS on. That’s outstanding and beats everything else on this list except the Coros Pace 2.
The catch: The design is plain — not ugly, just unremarkable. The MIP display (Memory-in-Pixel) is clear in daylight but dim in low light compared to AMOLED screens. Polar’s app ecosystem has fewer third-party integrations than Garmin Connect. And fewer of your running mates will have a Polar, which matters if you like sharing via the app.
Where to buy: Amazon UK, John Lewis, and direct from the Polar UK website. Less commonly stocked in physical shops than Garmin.
6. Amazfit T-Rex 3 — The Tough One
Price: About £90-100
If you run trails, cross-country, or parkrun courses that turn into mudbaths between October and March (so, most of them), the T-Rex 3 is worth a look. It’s built to MIL-STD-810G standards, which means it’ll handle drops, dust, extreme temperatures, and the kind of abuse that trail running dishes out.
The screen is a large 1.5-inch AMOLED — bright, colourful, and easy to read. GPS uses a dual-band system with support for five satellite systems, and accuracy is good even in heavily wooded areas.
Battery life is about 25-30 hours with full GPS, which is enough for ultra-distance events. In smartwatch mode, it’ll go for about 2-3 weeks.
The catch: It’s big. The 47mm case looks like a dinner plate on smaller wrists, and at 67 grams, it’s more than twice the weight of the Coros Pace 2. If you want something light and minimal, this isn’t it. The Zepp app limitations apply here too — less detailed training analysis than Garmin or Polar.
Where to buy: Amazon UK, direct from Amazfit, and occasionally Argos.
7. Samsung Galaxy Fit3 — The Smartwatch Compromise
Price: About £45-55
Right, this isn’t technically a running watch — it’s a fitness band. But at under £50, it’s worth mentioning for runners who are on a tight budget and want the basics done well.
It has GPS (connected — it uses your phone’s GPS), optical heart rate, sleep tracking, and a lovely AMOLED screen. For runs where you carry your phone anyway (plenty of runners do for safety or music), it tracks your run perfectly well through Samsung Health, which syncs to Strava.
Battery life is about 13 days in normal use. Water resistance is 5 ATM.
The catch: Without your phone, it can’t track GPS. It’s a companion device, not a standalone watch. The running metrics are basic — pace, distance, heart rate, that’s about it. No VO2 max, no training load, no recovery advice. If you want actual training features, spend the extra and get the Garmin or Coros.
Where to buy: Samsung UK, Amazon, Argos, Currys, John Lewis. Widely available and often discounted.
Quick Comparison Table
| Watch | Price | GPS Battery | Weight | HR Sensor | Display |
|---|---|---|---|---|---|
| Garmin Forerunner 55 | £80-100 | ~20 hrs | 37g | Elevate V3 | Colour MIP |
| Coros Pace 2 | £85-100 | ~30 hrs | 29g | Standard optical | Greyscale MIP |
| Amazfit GTS 4 Mini | £70-85 | ~15 hrs | 31.5g | BioTracker 3.0 | AMOLED |
| Garmin Forerunner 165 | £95-110* | ~17 hrs | 39g | Elevate V5 | AMOLED |
| Polar Pacer | £85-100 | ~35 hrs | 40g | Precision Prime | MIP |
| Amazfit T-Rex 3 | £90-100 | ~25 hrs | 67g | BioTracker | AMOLED |
| Samsung Galaxy Fit3 | £45-55 | Connected GPS | 36.8g | Standard optical | AMOLED |
*Sale price — RRP is higher
Which One Should You Buy?
- Best training ecosystem: Garmin Forerunner 55. The default recommendation for a reason. The watch is fine, the software is exceptional.
- Best for weight and battery life: Coros Pace 2. Nothing else under £100 comes close on either metric. Ideal for ultra and long-distance trail runners.
- Best looking: Amazfit GTS 4 Mini. Best screen, best looks, decent running features. Looks good with a shirt.
- Best if you spot it on sale under £100: Garmin Forerunner 165. The AMOLED screen and multi-band GPS make it the best running watch under £150, let alone under £100.
- Best for structured training: Polar Pacer. Polar’s training software is underrated and the heart rate sensor is excellent.
- Best for trails: Amazfit T-Rex 3. Built like a tank, and the GPS handles woodland well.
- Best on a tight budget: Samsung Galaxy Fit3. Does the basics for under £50. Best if you always run with your phone.
Where to Buy Running Watches in the UK
Online retailers with the best prices and regular discounts:
- Amazon UK — widest selection, frequent Lightning Deals
- Currys — good for Garmin and Samsung, price-matches Amazon
- John Lewis — 2-year guarantee included, great for peace of mind
- Argos — click and collect is handy for grabbing one on your lunch break
Specialist running/sports retailers:
- Sigma Sports — good range of Garmin, Coros, and Polar
- Wiggle — strong on Garmin and Coros, often has multi-buy deals
- SportsShoes.com — sometimes has exclusive colours and bundles
- Decathlon — stocks their own Kiprun watches plus some Garmin models
Buying tips:
- Check price history before buying. Use CamelCamelCamel for Amazon and Google Shopping for cross-retailer comparison.
- Amazon Prime Day (July) and Black Friday (November) are the best times to buy running watches. Discounts of 20-40% are common on last-generation models.
- Consider “last gen” — the Forerunner 55 was originally £180. Getting it for £80 because a newer model exists doesn’t make it a worse watch.
- John Lewis price matches and gives you a 2-year guarantee. Buy there if the price is within a few pounds of the lowest.
A Note on Accuracy Expectations
No GPS watch under £100 — or any price, really — is going to be perfectly accurate on every run. GPS has inherent limitations: tall buildings bounce signals, thick tree canopy weakens them, and even cloud cover can affect accuracy slightly.
On an open road or track, expect accuracy within 1-2%. In a dense city centre or heavily wooded trail, accuracy might drift to 3-5%. This is true of Garmin, Coros, Polar, and Amazfit equally.
If you’re training for a specific pace target, use a measured route (your local parkrun, an athletics track) to calibrate your expectations rather than trusting the watch implicitly on every run.
The same goes for wrist-based heart rate. It’s good enough for zone training — staying in zone 2 for easy runs, pushing into zone 4 for tempo work. For precise threshold testing or max HR work, a chest strap (about £30-50 for a Garmin HRM-Dual or Polar H10) is a worthwhile addition regardless of which watch you buy.
Wrapping Up
The best running watch under £100 in 2026 is whatever fits your priorities. I’d personally buy the Garmin Forerunner 55 because the software and training features are worth more than a flashy screen to me. But if you showed me the Coros Pace 2 at 29 grams and 30 hours battery, I’d have to think hard about it.
The brilliant thing about this price bracket is that there are no bad choices. Every watch on this list will track your runs, show your pace, monitor your heart rate, and sync to Strava. Five years ago, you’d have paid £200+ for any of these feature sets. The under-£100 running watch market is the best it’s ever been, and any of these picks will serve you well from couch to 5K right through to marathon training.
Frequently Asked Questions
What is the best running watch under £100 in the UK?
The Garmin Forerunner 55 is our top pick for most runners. It offers accurate GPS tracking, heart rate monitoring, and excellent battery life for under £100. The Garmin ecosystem and Connect app are also the best in class for analysing your training.
Do cheap running watches have accurate GPS?
Modern budget running watches from established brands like Garmin, Coros, and Amazfit are impressively accurate. In our testing, GPS accuracy on sub-£100 watches was within 1-2% of premium models costing three times as much.
Is a running watch better than using my phone?
A dedicated running watch offers more accurate GPS tracking, wrist-based heart rate monitoring, and won’t drain your phone battery. It’s also lighter and more comfortable than an armband. For regular runners doing three or more sessions per week, a watch is a worthwhile upgrade.
How long do budget running watches last?
Most running watches in the sub-£100 range last 3-5 years with regular use. Battery degradation is the main factor — expect around 20% battery capacity loss after 2-3 years. Software updates from brands like Garmin often add new features over time.
Do I need a running watch for Couch to 5K?
You don’t need one, but a basic running watch makes Couch to 5K more enjoyable. Seeing your pace improve week by week is motivating, and interval alerts help you follow the programme without constantly checking your phone. The Amazfit Bip 5 at around £60 is a great entry point.