Garmin Forerunner 255 vs Garmin Forerunner 955
The Verdict
Both Garmin Forerunner models deliver excellent sports tracking with nearly identical core features: SpO2 monitoring, always-on MIP displays, multi-band GPS, and 5ATM water resistance. Key differences emerge in battery performance and price. Forerunner 255 provides respectable 14-day smartwatch battery and 30-hour GPS endurance for $349, making it compelling for casual athletes. Forerunner 955 justifies its $150 premium with superior 15-day smartwatch battery and 42-hour GPS runtime, or 20-day and 49-hour figures with solar charging. Display resolution matches at 260x260, though 955's slightly larger case offers marginally more screen real estate. Software and health metrics remain virtually identical between models. Choose 255 if budget matters and typical training sessions last under 12 hours; select 955 for ultramarathoners, multi-day adventurers, and those valuing maximum battery longevity without frequent charging.
Who Should Buy
Buy the Garmin Forerunner 255 if…
- →14-day battery life means weekly charging at most
- →Multi-band GPS for exceptional outdoor tracking accuracy
- →Morning Report with daily training readiness and HRV status
Buy the Garmin Forerunner 955 if…
- →Full-color TopoActive maps built-in for navigation during runs
- →Training Readiness score combines HRV, sleep, and recovery data
- →Multi-band GPS is the gold standard for running accuracy
Category Scores
Pros & Cons
Garmin Forerunner 255
Pros
- 14-day battery life means weekly charging at most
- Multi-band GPS for exceptional outdoor tracking accuracy
- Morning Report with daily training readiness and HRV status
- Race Predictor estimates finish times for 5K to marathon
- Lightweight at 49 g and comfortable for 24/7 wear
Cons
- MIP display lacks the vibrancy of AMOLED competitors
- No touchscreen on base model — button-only navigation
- No ECG or blood pressure monitoring
- Limited smart features compared to Apple Watch or Wear OS
- Third-party app ecosystem is small
Garmin Forerunner 955
Pros
- Full-color TopoActive maps built-in for navigation during runs
- Training Readiness score combines HRV, sleep, and recovery data
- Multi-band GPS is the gold standard for running accuracy
- Solar model extends battery to 20 days — charge once or twice a month
- Music storage and playback without needing your phone
Cons
- MIP display looks dull compared to AMOLED on the Forerunner 265
- 14.4mm thick — chunky profile under dress shirt cuffs
- No touchscreen — button-only navigation
- Solar variant adds $100 for marginal battery improvement indoors
Full Specifications
| Spec | Garmin Forerunner 255 | Garmin Forerunner 955 |
|---|---|---|
| Software | Garmin proprietary OS | Garmin OS (Connect IQ) |
| Body | ||
| Weight | 49 g | 53 g |
| Case material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Water resistance | 5ATM | 5ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 14 days (smartwatch), 30 hrs GPS | Up to 15 days (smartwatch), 42 hrs GPS (Solar: 20 days / 49 hrs) |
| Display | ||
| Size | 46mm | 46.5mm (1.3 inches) |
| Type | MIP (Memory-in-Pixel) transflective | MIP (memory-in-pixel) transflective |
| Always-on display | ||
| Resolution | 260 x 260 | 260 x 260 |
| Processor | ||
| Chipset | Garmin custom SoC | Garmin custom processor |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.0 |
Related Comparisons
This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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