Wear Radar

Garmin FenixvsGarmin Forerunner 170

18d vs 10d
battery life
Garmin Fenix lasts longer
$700
price gap
Garmin Forerunner 170 cheaper
13g
lighter
Garmin Forerunner 170
5
more health sensors
Garmin Fenix
Garmin Fenix
Buy/Wait:bad

Late in cycle — a new model is likely coming

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Garmin Forerunner 170
Buy/Wait:good

Current model just released

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Garmin FenixGarmin Forerunner 170
Pricing
Starting price$999$299
Subscriptionℹ️ Optional — $70/yrℹ️ Optional — $70/yr
Hardware
Weight56g43g
Water resistance10ATM5ATM
Battery18 days10 days
Always-on display
GPS
Cellular
PlatformiOS & AndroidiOS & Android
TierSports GPSSports GPS
Buy timing
ReleasedAug 14, 2024May 15, 2026
Cycle advicebadgood
Deals advicegoodneutral
Next modelGarmin Fenix 9 (Expected fall 2026 (September–October))

Health Sensors

Garmin Fenix only
5 exclusive sensors
Running DynamicsCadence, ground contact time, stride length, vertical oscillation
RespirationBreathing rate during sleep and activity
Skin TempOvernight changes linked to illness or cycle tracking
Depth GaugeMeasures water depth — certified for recreational diving to 40m
ECGDetects irregular heart rhythms (AFib)
Both
6 shared
Heart RateContinuous or on-demand pulse tracking
SpO2Blood oxygen saturation, tracked during sleep
HRVHeart rate variability — stress & recovery scores
Stress TrackingStress estimate from HRV and physiological signals
Body BatteryGarmin's energy reserve — how much fuel left in the tank
Training ReadinessDaily recovery score — how ready you are to perform
Garmin Forerunner 170 only
No exclusive sensors

Why buy each?

Garmin Fenix

Built-in speaker and microphone

First Fenix to include a speaker — enabling phone calls, Bluetooth audio, and voice prompts directly from the watch.

AMOLED or Solar: choose your battery priority

AMOLED for the best display at 18 days. Solar MIP for up to 48+ days in expedition conditions where charging is impossible.

Certified for diving, rated for mountains

EN13319 dive mode (up to 40m), MIL-STD-810 shock resistance, and TopoActive maps covering 100+ countries — the most capable outdoor watch in Garmin's lineup.

Garmin Forerunner 170

Training Readiness at entry level

Training Readiness, full Training Status, and wrist-based running power — analytics previously reserved for Garmin's mid-range — now on a $299.99 watch.

AMOLED display and 10-day battery

A bright 1.2" AMOLED touchscreen with a traditional 5-button design, up to 10 days of battery in smartwatch mode and around 17 hours of GPS.

Garmin Pay and 80+ sports apps

Contactless payments arrive on the entry Forerunner for the first time, alongside 80+ built-in sports apps and Garmin Coach adaptive training plans.

Quick Winner

The right pick depends on what you optimize for.

For the budget
Garmin Forerunner 170 wins

$509 vs $1209 over 3 years.

For battery life
Garmin Fenix wins

18 days vs 10 days battery.

For health depth
Garmin Fenix wins

11 sensors.

For daily comfort
Garmin Forerunner 170 wins

43g.

Bottom Line

Technical gaps
  1. Fenix-only sensors: Running Dynamics, Respiration, Skin Temp, Depth Gauge, ECG.
  2. Weight. Forerunner 170 is 13g lighter — relevant for all-day comfort and sleep.
  3. Water resistance. Fenix rates 10ATM vs 5ATM on Forerunner 170.
Commercial gaps
  1. Hardware cost. Forerunner 170 is $700 cheaper upfront ($299 vs $999).
Pick the Garmin Fenix if…

Expedition athletes, adventure racers, triathletes, mountaineers, and divers who need the most capable and durable GPS watch Garmin makes. Also for anyone who wants Garmin's best — full stop.

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Pick the Garmin Forerunner 170 if…

Beginner and intermediate runners who want real GPS accuracy and Garmin's analytics depth without the price of the 570 or 970. With Training Readiness and running power now included, it closes much of the gap to Garmin's mid-range — the default first serious GPS watch.

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