Quick Picks
Best Overall: Apple Watch Ultra 2 — $799
Best for Serious Swimmers: Garmin Swim 2 — $249
Best Value: Garmin Forerunner 255 — $349
Best for Triathletes: Garmin Forerunner 965 — $599
Best Budget: Amazfit GTR 4 — $199
Best for Android: Samsung Galaxy Watch 7 — $299
Understanding Water Resistance
Not all "waterproof" watches are created equal. Here's what the ratings mean:
Water Resistance Ratings
5ATM / 50 meters: Safe for pool swimming, showering, and surface water activities. NOT suitable for diving, high-velocity water, or snorkeling depths. Most mainstream smartwatches are rated 5ATM.
10ATM / 100 meters: Suitable for swimming, snorkeling, and recreational diving to shallow depths. Apple Watch Ultra, Samsung Galaxy Watch Ultra, and dedicated dive watches meet this standard.
ISO 22810: The proper certification for swim-proof watches. Look for this beyond just depth ratings.
Important: Water resistance degrades over time. Seals can weaken from temperature changes, soap, chlorine, and saltwater. Consider professional water resistance testing annually if you swim frequently.
Swimming Features to Look For
Lap counting: Automatic detection of pool turns and lap totals
Stroke detection: Identifies freestyle, backstroke, breaststroke, butterfly
SWOLF score: Swimming efficiency metric (strokes + time per lap)
Pace alerts: Vibration alerts when you're above/below target pace
Drill logging: Manual logging for kick drills and non-standard exercises
Open water GPS: Track distance and route in lakes and oceans
Rest timer: Tracks rest intervals between sets
Our Top Picks
Apple Watch Ultra 2
The Apple Watch Ultra 2 is the most capable all-around smartwatch for swimmers. With 100m water resistance (10ATM), it's rated for recreational diving and serious water sports. The 49mm titanium case shrugs off pool chemicals and saltwater.
Swimming features: Pool swim workout tracks laps, stroke type, distance, pace, and SWOLF. Open Water mode uses GPS to track distance and route. The Oceanic+ app enables actual dive functionality with depth, time, and no-deco limits.
Beyond swimming: Full Apple Watch experience with the best smartwatch functionality, fitness tracking, and health features. The Action Button can start workouts instantly.
Garmin Swim 2
Purpose-built for swimmers who want detailed training analytics without flagship pricing. The Swim 2 excels at what matters: accurate lap counting, stroke analysis, critical swim speed (CSS) calculation, and training zone guidance.
Pool mode: Auto-detects pool length, tracks stroke type/count/rate, calculates SWOLF, and provides interval-by-interval breakdowns. Drill logging captures non-swim sets.
Open water: GPS tracking with distance, pace, and stroke data. Works in lakes, rivers, and ocean without pool walls.
The slim, lightweight design (36g) is barely noticeable during workouts. 7-day battery life means no charging anxiety.
Garmin Forerunner 255
A multi-sport watch that happens to be excellent for swimming. The Forerunner 255 includes all Garmin swimming features—pool and open water modes, stroke detection, drill logging, SWOLF—plus running, cycling, and gym tracking.
If you swim as part of broader fitness training (or triathlon prep), the 255 offers better overall value than a swim-specific watch. Training Status and Recovery Time features help optimize cross-training.
Garmin Forerunner 965
The ultimate triathlon training tool. The 965's AMOLED display makes data readable even through foggy goggles. Triathlon mode seamlessly transitions between swim, bike, and run with automatic activity detection.
Swimming analytics are comprehensive: pool and open water tracking, stroke analysis, SWOLF, drill logging, and integration with Garmin's full training ecosystem. Post-workout, analyze every interval in Garmin Connect.
21-day battery (in smartwatch mode) means you can train and race without charging concerns.
Amazfit GTR 4
The GTR 4 offers swim tracking at a fraction of Garmin pricing. Pool swimming mode includes lap counting, stroke detection, SWOLF calculation, and calorie tracking. It's not as detailed as Garmin, but covers the essentials.
The real value: you get an excellent everyday smartwatch (AMOLED display, 14-day battery, full fitness tracking) that also handles swimming well. Perfect for recreational swimmers who don't need elite-level analytics.
Samsung Galaxy Watch 7
Samsung's Galaxy Watch 7 delivers solid swim tracking with full Android smartwatch functionality. Pool Swimming tracks laps, strokes, SWOLF, and pace. The 5ATM + IP68 rating handles pool and ocean swimming.
Where Samsung shines: seamless Galaxy phone integration, Google apps, body composition tracking, and comprehensive health monitoring. If you want a great smartwatch that also tracks swimming, this is the Android choice.
Pool vs. Open Water Swimming
Pool swimming relies on accelerometers to detect turns and count laps. Most modern watches handle this accurately once you input the correct pool length.
Open water swimming requires GPS, which doesn't work underwater. Watches capture your position when your arm surfaces during strokes. Accuracy depends on stroke rate and GPS frequency. Garmin and Apple Watch handle this well; budget watches may be less accurate in open water.
Tips for Swimming with Smart Watches
• Rinse after every swim — Chlorine and salt corrode seals and contacts
• Enable water lock — Prevents accidental screen touches
• Verify pool length — 25m, 25yd, 50m settings affect all metrics
• Position on wrist — Snug fit improves heart rate accuracy
• Dry before charging — Water in charging port causes issues
The Bottom Line
For the best all-around swimming and smartwatch experience, choose the Apple Watch Ultra 2 (iPhone) or Samsung Galaxy Watch 7 (Android). Serious swimmers should look at the Garmin Swim 2 for dedicated training features at a reasonable price. Triathletes will love the Garmin Forerunner 965. And budget swimmers can't go wrong with the Amazfit GTR 4 at $199.