For running watches, choose Forerunner 245 for lower cost; pick Forerunner 255 for multiband GPS, triathlon, Garmin Pay, and longer battery.
Garmin Forerunner 245
Garmin Forerunner 255
Budget Runner: Save Big
- Stick to run profiles and core metrics.
- Add Music only if you want phone‑free playback.
- Light feel for small wrists.
Forerunner 245 / 245 Music
Balanced Training: Race Ready
- Multiband GPS for tough routes.
- Triathlon, open‑water swim, Garmin Pay.
- Battery gain for long weekends.
Forerunner 255 / 255S
OLED Step‑Up (If You Want Newer)
- Brighter screen and touch.
- Training Readiness score on watch.
- Costs more; not needed for basics.
Forerunner 265
Picking a running watch shapes how you plan, pace, and pay on race day. The Forerunner 245 keeps things simple at a friendly price, while the 255 adds multiband GPS, tri mode, and wallet‑free checkout. This guide gives you the fast verdict and the trade‑offs so you can buy once and run happy.
In A Nutshell
If you want the lowest price for reliable run tracking, the Forerunner 245 still works. If you want better positioning, triathlon support, HRV‑based insights, Garmin Pay, and longer battery, the 255 is the smarter spend. The 255’s GPS and battery specs are stronger, and it adds a barometric altimeter for accurate climbs.
Side‑By‑Side Specs
ℹ️ Good To Know: The 255’s “All Systems” and “Multi‑Band” modes improve tracking in tough areas but shorten battery versus GPS‑Only. Garmin rates 30 hr (GPS‑Only) and 25 hr (All Systems) on the standard 255.
Forerunner 245 — What We Like / What We Don’t Like
✅ What We Like
- Light on the wrist (~38.5 g) yet durable with Gorilla Glass 3.
- Solid run metrics at a friendly MSRP ($299.99; Music $349.99).
- Battery holds up for a week of daily wear; GPS runs up to 24 hours.
⚠️ What We Don’t Like
- No barometric altimeter; elevation relies on GPS/DEM smoothing.
- No Garmin Pay; no triathlon or open‑water swim.
- Music and Wi‑Fi only on the Music variant (≈500 songs).
Weight and display durability are widely documented; MSRP and battery figures come from U.S. listings and the owner’s manual, while the lack of altimeter and mobile payments is confirmed by respected outlets.
Forerunner 255 — What We Like / What We Don’t Like
✅ What We Like
- Multi‑band GNSS and “All Systems” for tougher routes.
- Triathlon profile and open‑water swim built in.
- Battery jump to 14 days smartwatch / 30 hr GPS; HRV status and morning report add context.
- Garmin Pay on‑wrist checkout; Music model stores ≈500 songs (4 GB).
⚠️ What We Don’t Like
- Higher MSRP than the 245; Music adds another bump.
- Heavier case (~49 g on the 46 mm size).
- No on‑watch Training Readiness (that arrives on the 265).
Multi‑band and tri mode are confirmed by independent and retail listings; battery and HRV status come from manuals and support, while MSRP tiers and the lack of Training Readiness on this model are well covered by U.S. tech sites.
Forerunner 245 Or 255: Which Fits You Better
Display & Build
Both use a sunlight‑visible MIP screen behind Gorilla Glass. The 245 runs a 1.2‑inch panel at 240×240, while the 255 steps up to 1.3‑inch at 260×260 on the 46 mm case. The 255S keeps things compact with a smaller case and band. If you squint at numbers mid‑tempo, the larger panel on the 255 helps.
Battery & Charging
The 245 is rated up to 7 days in smartwatch mode and up to 24 hours of continuous GPS. The 255 nearly doubles smartwatch time to 14 days and lifts GPS‑Only to 30 hours. Switch the 255 to “All Systems” with multi‑band on tough routes and expect closer to 25 hours. All charge with Garmin’s 4‑pin cable.
Cameras & Sensors
No cameras here—just sensors that matter. The 255 adds a barometric altimeter and a multi‑band GNSS chipset; climbs log truer and tracks stick better around tall buildings or tree cover. The 245 lacks a barometric altimeter and relies on GPS/DEM smoothing for elevation. If you run hilly routes or race tri, the 255’s stack pays off.
Software & Updates
Both deliver Training Status, VO₂ max, and suggested workouts. The 255 adds HRV Status and Morning Report, which color your sleep and recovery picture. That can steer an easy day when a big session sits on your plan. The 245 keeps Training Status but doesn’t add HRV‑based readiness scoring on the watch.
Ports & Connectivity
Bluetooth, ANT+, and Wi‑Fi cover sensors and sync on both Music variants. The 255 includes NFC for Garmin Pay; the 245 line does not. If you love finishing a long run with a coffee, leaving your wallet at home is a small everyday win.
Pricing & Packages
In the U.S., the 245 launched at $299.99 (Music at $349.99). The 255 launched at $349.99 (Music at $399.99), with 46 mm and 41 mm (255S) sizes. Street prices shift during sales, but those tiers define where each sits.
ℹ️ Good To Know: Both carry a 5 ATM rating suitable for surface swimming; see Garmin’s water‑rating definitions for details. Water‑rating definitions. The 255 Music’s storage is ~4 GB (≈500 songs); the 245 Music holds ≈3.5 GB (≈500 songs).
Price, Value & Ownership
Garmin’s U.S. warranty for fitness wearables covers one year. Bands use standard quick‑release sizes (20 mm on 245; 22/18 mm on 255/255S). Payments differ: 255 includes Garmin Pay, while the 245 line does not. Music storage figures come from product manuals.
Where Each One Wins
🏆 GPS In Tough Areas — Forerunner 255
🏆 Triathlon & Open‑Water — Forerunner 255
🏆 On‑Wrist Payments — Forerunner 255
🏆 Featherweight Feel — Forerunner 245
Decision Guide
✅ Choose Forerunner 245 If…
- You want reliable run tracking and Training Status without paying for extras.
- You prefer a light watch that disappears on the wrist for daily wear.
- You don’t need triathlon, Garmin Pay, or barometric climb data.
✅ Choose Forerunner 255 If…
- You run under tree cover or near tall buildings and want multiband accuracy.
- You race tri or swim open water and want one watch for swim‑bike‑run.
- You want Garmin Pay and more battery for long weekends away.
Best Fit For Most Runners
Most buyers should start with the Forerunner 255. The jump to multiband GPS, triathlon profiles, HRV‑based context, and Garmin Pay adds daily and race‑day ease the 245 can’t match. If you only need a dependable run tracker at the lowest price, the 245 still delivers, but the 255’s gains feel meaningful once you’re training for a race.
Want the official definitions behind water ratings and HRV? See Garmin’s water‑rating guide and HRV Status support page.
This comparison compiles specifications and pricing from U.S. manuals, support pages, and retailer listings. Launch MSRPs and feature notes were cross‑checked against official documents and reputable U.S. publications.