Garmin
Forerunner® 265S vs Instinct® E – 40 mm
Size, specs & wrist fit compared
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Which one fits you
On wrists narrower than about 44mm, the Instinct® E – 40 mm is the safer pick — it stays proportionate down to roughly 42mm, where the Forerunner® 265S starts to hang over the edge. Above 44mm both sit cleanly, and the Forerunner® 265S gives you more presence.
The Forerunner® 265S wears larger than the Instinct® E – 40 mm (41.7mm vs 40mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Forerunner® 265S is the slimmer of the two (12.9mm vs 13.6mm), so it slides under a cuff more easily.
On the wrist the Forerunner® 265S feels lighter (39g vs 41g, case only).
The Forerunner® 265S is middle-of-the-pack for thickness among the 648 42mm watches in the database.
Among the 540 40mm watches we hold thickness for, the Instinct® E – 40 mm is thicker than 98% — it will sit high even though the case width reads modest.
The Forerunner® 265S is 1.7mm wider, 1.7mm longer, 0.7mm thinner and 2g lighter than the Instinct® E – 40 mm. Both are circular.
Forerunner® 265S
Instinct® E – 40 mm
Case width
41.7mm
40mm−1.7mm
Lug-to-lug
41.7mm
40mm−1.7mm
Thickness
12.9mm
13.6mm+0.7mm
Weight
39g
41g+2g
Switch or add watches
Garmin
Forerunner® 265S
Garmin
Instinct® E – 40 mm
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist.
Highlight
- Garmin Forerunner® 265S41.7mm · 12.9mm thick
- Garmin Instinct® E – 40 mm40mm · 13.6mm thick
3D preview
Forerunner® 265S vs Instinct® E – 40 mm on a wrist
Sized to your own wrist, turned any way you like.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Battery life compared
Runtime for every power mode either watch publishes, 1 of them directly comparable.
Forerunner® 265SInstinct® E – 40 mm
Battery Saver
—35 daysExpedition GPS Activity
—17 daysSmartwatch
15 days14 daysMax Battery GPS
—43 hoursGPS-Only GNSS
24 hours—GPS
—21 hoursSatIQ GNSS
18 hours—All-Systems GNSS + Multi-Band
15 hours—All Satellite Systems
—14 hoursGPS-Only GNSS with music
7.5 hours—SatIQ GNSS with music
7 hours—All-Systems GNSS + Multi-Band with music
6 hours—
Specifications
The short version
7 key specs| Spec | GarminForerunner® 265S | GarminInstinct® E – 40 mm |
|---|---|---|
| Case Width | 41.7mm | 40mm |
| Thickness | 12.9mm | 13.6mm |
| Weight | 39g | 41g |
| Shape | Circular | Circular |
| Display type | AMOLED (optional always-on mode) | Monochrome, sunlight-visible, transflective memory-in-pixel (MIP) |
| Battery life | Smartwatch mode: Up to 15 days GPS-Only GNSS mode: Up to 24 hours SatIQ (AutoSelect) GNSS mode: Up to 18 hours All-Systems GNSS mode + Multi-Band: Up to 15 hours GPS-Only GNSS mode with music: Up to 7.5 hours SatIQ (AutoSelect) GNSS mode with music: Up to 7 hours All-Systems GNSS mode + Multi-Band with music: Up to 6 hours See Details | Smartwatch: Up to 14 days Battery Saver Watch Mode: Up to 35 days GPS: Up to 21 hours All Satellite Systems: 14 hours Max Battery GPS Mode: Up to 43 hours Expedition GPS Activity: Up to 17 days |
| Released | 2023 | 2025 |
Every specification
259 specs| Spec | Garmin Forerunner® 265S | Garmin Instinct® E – 40 mm |
|---|---|---|
| Overview | ||
| Family | Garmin | Garmin |
| General | ||
| Battery life | Smartwatch mode: Up to 15 days GPS-Only GNSS mode: Up to 24 hours SatIQ (AutoSelect) GNSS mode: Up to 18 hours All-Systems GNSS mode + Multi-Band: Up to 15 hours GPS-Only GNSS mode with music: Up to 7.5 hours SatIQ (AutoSelect) GNSS mode with music: Up to 7 hours All-Systems GNSS mode + Multi-Band with music: Up to 6 hours See Details | Smartwatch: Up to 14 days Battery Saver Watch Mode: Up to 35 days GPS: Up to 21 hours All Satellite Systems: 14 hours Max Battery GPS Mode: Up to 43 hours Expedition GPS Activity: Up to 17 days |
| Battery type | Lithium ion | Lithium ion |
| Display Size | 1.1" (28.1 mm) diameter | custom, two-window design; 0.86” x 0.86” (22 x 22 mm) |
| Color display | Yes | — |
| Lens Material | Corning® Gorilla® Glass 3 | Chemically Strengthened Glass |
| Bezel Material | fiber-reinforced polymer | fiber-reinforced polymer |
| Memory/History | 8 GB | 128 MB |
| Strap material | silicone | silicone |
| Charging method | Garmin proprietary plug charger | Garmin proprietary plug charger |
| Large font option | Yes | — |
| Display resolution | 360 x 360 pixels | 166 x 166 pixels (active area) |
| Quick Release bands | yes (18 mm, Industry standard) | — |
| Case material | — | fiber-reinforced polymer |
| QuickFit® watch band compatible | — | yes (20 mm) |
| Sensors | ||
| GPS | Yes | Yes |
| QZSS | Yes | — |
| BeiDou | Yes | — |
| Compass | Yes | Yes |
| GLONASS | Yes | Yes |
| Galileo | Yes | Yes |
| Gyroscope | Yes | — |
| Thermometer | Yes | Yes |
| Accelerometer | Yes | Yes |
| SatIQ™ Technology | Yes | — |
| Ambient light sensor | Yes | — |
| Barometric altimeter | Yes | Yes |
| Pulse Ox Blood Oxygen Saturation Monitor | Yes | Yes |
| Garmin Elevate™ wrist heart rate monitor | Yes | Yes |
| Product Info | ||
| Main SKU | 010-02810-04 | 010-02932-00 |
| Product ID | 886689 | 1314137 |
| Product Name | Forerunner® 265S | Instinct® E – 40 mm |
| Release Date | 3/2/2023 | 1/6/2025 |
| Product Variation | Black Bezel with Whitestone Case and Whitestone/Neo Tropic Silicone Band | Black with Charcoal Band |
| Clock Features | ||
| Timer | Yes | Yes |
| Stopwatch | Yes | Yes |
| Time/date | Yes | Yes |
| Alarm clock | Yes | Yes |
| GPS Time Sync | Yes | Yes |
| Sunrise/sunset times | Yes | Yes |
| Automatic daylight saving time | Yes | Yes |
| Cycling Features | ||
| Courses | Yes | Yes |
| Race an activity | Yes | Yes |
| Power meter compatible | Yes | — |
| Power curve and % FTP workouts | Yes | — |
| Compatible with Varia™ lights | Yes | Yes |
| Compatible with Varia headlight camera | Yes | — |
| Speed and cadence sensor support (w/sensor) | Yes | Yes |
| Bike lap and lap maximum power (with power sensor) | Yes | — |
| Compatible with Varia™ radar (rear-facing radar) | Yes | — |
| Compatible with Vector™ and Rally™ (power meters) | Yes | — |
| Compatible with Varia Vision™ (head-mounted display) | Yes | — |
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | Yes | Yes |
| Running Features | ||
| Run workouts | Yes | Yes |
| Running power | Yes | — |
| Race predictor | Yes | Yes |
| Foot pod capable | Yes | Yes |
| Running dynamics | Yes | Yes |
| Lactate threshold | Yes | — |
| Grade-adjusted pace | Yes | — |
| Trail run auto climb | Yes | Yes |
| Performance condition | Yes | — |
| Run/Walk/Stand detection | Yes | Yes |
| Stride length (real time) | Yes | Yes |
| PacePro™ Pacing Strategies | Yes | — |
| Vertical oscillation and ratio | Yes | Yes |
| Ground contact time and balance | yes (with compatible accessory) | yes (but not balance) |
| GPS-based distance, time and pace | Yes | Yes |
| Course- and weather-specific race predictor | Yes | — |
| Cadence (provides real-time number of steps per minute) | Yes | Yes |
| What You'll Love | ||
| Touchscreen | Yes | — |
| Display type | AMOLED (optional always-on mode) | Monochrome, sunlight-visible, transflective memory-in-pixel (MIP) |
| Water rating | 5 ATM | 10 ATM |
| Garmin Pay™ | Yes | — |
| Music storage | Yes | — |
| Multi-band GPS | Yes | — |
| Training status | yes (improved) | — |
| Training readiness | Yes | — |
| Pulse Ox blood oxygen | yes (spot-check, and optional all-day acclimation and in sleep) | Yes |
| Sleep score and insights | Yes | Yes |
| Battery life (smartwatch mode) | Up to 15 days | Up to 14 days |
| Activity Profiles | ||
| Gym | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing |
| Swim | Pool Swimming, Open Water Swimming | Pool Swimming, Open Water Swimming |
| Cycling | Biking, Mountain Biking, eBiking, eMountain Biking, Indoor Biking | Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross, BMX |
| Wellness | Walking, Pilates, Yoga, Indoor Walking | Walking, Pilates, Yoga |
| Multisport | Triathlon | — |
| In the ring | Boxing, Mixed Martial Arts | — |
| Team sports | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball |
| On the Water | Stand Up Paddleboarding, Rowing | Stand Up Paddleboarding, Rowing, Kayaking, Fishing, Boating, Whitewater |
| Racket sports | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball |
| Snow & winter | Skiing, Snowboarding, XC Classic Skiing | Skiing, Snowboarding, XC Classic Skiing, XC Skate Skiing, Ice Skating, Snowshoeing |
| Indoor running | Treadmill Running, Indoor Track Running, Virtual Running | Treadmill Running, Indoor Track Running, Virtual Running |
| Outdoor running | Running, Outdoor Track Running, Trail Running, Ultra Running | Running, Outdoor Track Running, Trail Running |
| Outdoor recreation | Hiking, Bouldering, Archery | Hiking, Climbing, Hunting, Horseback Riding, Archery |
| Other activity profiles | Inline skating | Tactical |
| Swimming Features | ||
| Pool swim workouts | Yes | Yes |
| Critical swim speed | Yes | — |
| Time and distance alerts | Yes | Yes |
| Auto rest (pool swim only) | Yes | Yes |
| Drill logging (pool swim only) | Yes | Yes |
| Pacing alerts (pool swim only) | Yes | — |
| Countdown start (pool swim only) | Yes | Yes |
| Underwater wrist-based heart rate | Yes | Yes |
| "Repeat on" rest timer (pool swim only) | Yes | Yes |
| Basic rest timer (up from 0) (pool swim only) | Yes | Yes |
| Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) | Yes | Yes |
| Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) | Yes | Yes |
| Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) | Yes | Yes |
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | yes (with HRM-Swim, HRM-Pro, HRM-Pro Plus or HRM 600) | — |
| Outdoor Recreation | ||
| Up Ahead | Yes | — |
| Auto rest | Yes | — |
| TracBack® | Yes | Yes |
| Back to start | Yes | Yes |
| Fish forecast | yes (via Connect IQ™) | — |
| UltraTrac mode | Yes | Yes |
| Vertical speed | Yes | Yes |
| Area calculation | yes (via Connect IQ™) | Yes |
| Elevation profile | Yes | Yes |
| Projected waypoint | Yes | Yes |
| Total ascent/descent | Yes | Yes |
| Future elevation plot | Yes | Yes |
| Distance to destination | Yes | Yes |
| Sun and moon information | Yes | Yes |
| Point-to-point navigation | Yes | Yes |
| Rest Timer (Ultra Run only) | Yes | — |
| Bread crumb trail in real time | Yes | Yes |
| Barometric trend indicator with Storm Alert | Yes | Yes |
| Tides | — | Yes |
| Sight 'N Go | — | Yes |
| Tide glance | — | Yes |
| GPS coordinates | — | Yes |
| Reference point | — | Yes |
| Expedition GPS Activity | — | Yes |
| Daily Smart Features | ||
| Stocks | yes (optional Connect IQ app) | — |
| Calendar | Yes | Yes |
| Passcode | Yes | Yes |
| Connectivity | Bluetooth®, ANT+®, Wi-Fi® | Bluetooth®, ANT+® |
| Garmin Share | Yes | Yes |
| Find My Phone | Yes | Yes |
| Find My Watch | Yes | Yes |
| VIRB® Remote | Yes | Yes |
| Morning report | Yes | Yes |
| Red shift mode | Yes | — |
| Weather forecasts | Yes | Yes |
| Smart Notifications | Yes | Yes |
| Smart trainer control | Yes | — |
| Smartphone compatibility | iPhone®, Android™ | iPhone®, Android™ |
| Controls smartphone music | Yes | Yes |
| On-device Connect IQ™ Store | Yes | Yes |
| Plays and controls watch music | Yes | — |
| Find My Phone during GPS activity | Yes | — |
| Pairs with Garmin Connect™ Mobile | Yes | Yes |
| Compatible with Garmin Messenger app | Yes | — |
| Battery saver (customizable low power watch) | Yes | Yes |
| Realtime settings sync with Garmin Connect™ mobile | Yes | Yes |
| View images from notifications on watch (Android™ only) | Yes | — |
| Text response/reject phone call with text (Android™ only) | Yes | Yes |
| Connect IQ™ (downloadable watch faces, data fields and apps) | Yes | Yes |
| Activity Tracking Features | ||
| TrueUp™ | Yes | Yes |
| Move IQ™ | Yes | Yes |
| Step counter | Yes | Yes |
| Floors climbed | Yes | Yes |
| Calories burned | Yes | Yes |
| Distance traveled | Yes | Yes |
| Intensity minutes | Yes | Yes |
| Automatic rep counting | Yes | Yes |
| Garmin Connect™ Challenges app | yes (optional Connect IQ app) | yes (optional Connect IQ app) |
| Move alerts (displays on device after a period of inactivity) | Yes | Yes |
| Auto goal (learns your activity level and assigns a daily step goal) | Yes | Yes |
| Workout and Training Plans | ||
| HIIT workouts | Yes | Yes |
| Yoga workouts | Yes | Yes |
| Cardio workouts | Yes | Yes |
| Pilates workouts | Yes | Yes |
| Strength workouts | Yes | Yes |
| Garmin Cycling Coach | Yes | — |
| Garmin Running Coach | Yes | — |
| Garmin Coach - Strength | Yes | — |
| Garmin Running Coach Experts | Yes | Yes |
| On-screen workout animations | Yes | — |
| On-screen workout muscle maps | Yes | — |
| Garmin Coach - Prebuilt Cycling Plans | Yes | Yes |
| Daily Suggested Workout - Cycling (Pace and Heart Rate Based) | Yes | Yes |
| Daily Suggested Workout - Running (Pace and Heart Rate Based) | Yes | Yes |
| Health & Wellness Monitoring | ||
| Sleep | yes (advanced) | yes (advanced) |
| Hydration | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Breathwork | Yes | Yes |
| Meditation | Yes | — |
| Fitness age | Yes | Yes |
| Sleep coach | Yes | — |
| Nap detection | Yes | Yes |
| All-day stress | Yes | Yes |
| Women's health | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Health snapshot | Yes | Yes |
| Jet lag adviser | Yes | — |
| Respiration rate | Yes | Yes |
| Resting heart rate | Yes | Yes |
| Breathing variations | Yes | Yes |
| Relaxation reminders | Yes | Yes |
| Abnormal heart rate alerts | yes (high and low) | yes (high and low) |
| Relaxation breathing timer | Yes | Yes |
| Body Battery™ energy monitor | Yes | Yes |
| Wrist-based heart rate (constant, every second) | Yes | Yes |
| Safety and Tracking Features | ||
| Assistance | Yes | Yes |
| Live Event Sharing | Android™ Only | Yes |
| Incident Detection during select activities | Yes | Yes |
| Incident detection alert on phone for wearables | Yes | Yes |
| Kid Activity Tracking Features | ||
| Toe-to-Toe™ Challenges app | yes (optional Connect IQ Toe-to-Toe™ Challenges app) | yes (optional Connect IQ Toe-to-Toe™ Challenges app) |
| Training, Planning and Analysis Features | ||
| % HRR | Yes | Yes |
| % HR max | Yes | Yes |
| HR zones | Yes | Yes |
| HR alerts | Yes | Yes |
| Shortcuts | Yes | Yes |
| HRV status | Yes | Yes |
| Load ratio | Yes | — |
| Manual lap | Yes | Yes |
| Rest timer | Yes | Yes |
| Auto max HR | Yes | Yes |
| Auto scroll | Yes | Yes |
| Finish time | Yes | Yes |
| HR calories | Yes | Yes |
| Voice alerts | Yes | Yes |
| Custom alerts | Yes | Yes |
| Physio TrueUp | Yes | Yes |
| Recovery time | Yes | Yes |
| Training load | Yes | — |
| VO2 Max (Run) | Yes | Yes |
| Course guidance | Yes | Yes |
| Training effect | Yes | Yes |
| Virtual Partner | Yes | Yes |
| Race an Activity | Yes | Yes |
| Advanced workouts | Yes | Yes |
| Interval training | Yes | Yes |
| Race glance/widget | Yes | — |
| Training load focus | Yes | — |
| VO2 Max (Trail Run) | Yes | Yes |
| GPS speed and distance | Yes | Yes |
| Improved recovery time | Yes | — |
| Configurable lap alerts | Yes | Yes |
| Customizable data pages | Yes | Yes |
| Unified training status | Yes | — |
| Touch and/or button lock | Yes | Yes |
| Activity history on watch | Yes | Yes |
| Multisport auto transition | Yes | — |
| Downloadable training plans | Yes | Yes |
| Training effect (anaerobic) | Yes | Yes |
| Manual multisport activities | Yes | — |
| HRM running pace and distance | Yes | Yes |
| Customizable activity profiles | Yes | Yes |
| Auto Pause® automatic timer halt | Yes | Yes |
| Respiration rate (during exercise) | yes (with compatible accessory) | Yoga and Breathwork only |
| Auto Lap® interval tracking feature | Yes | Yes |
| Primary benefit (Training Effect labels) | Yes | Yes |
| HR broadcast (broadcasts HR data over ANT+® to paired devices) | Yes | Yes |
| Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | Yes | — |
| Workout benefit | — | Yes |
| Heat and altitude acclimation | — | Yes |
| Power Modes - customizable in-activity battery settings | — | Yes |
| Tactical Features | ||
| XERO™ Locations | — | Yes |
| Dual grid coordinates | — | Yes |
Wrist Fit
Garmin Forerunner® 265S
Sits best on wrists ~44–60mm wide (≈ 11.7–16.0cm circumference).
Garmin Instinct® E – 40 mm
Sits best on wrists ~42–57mm wide (≈ 11.2–15.2cm circumference).
Frequently Asked Questions
Is the Garmin Forerunner® 265S bigger than the Garmin Instinct® E – 40 mm?
The Garmin Forerunner® 265S is bigger — 41.7mm vs 40mm case width.
Which fits a smaller wrist better, the Garmin Forerunner® 265S or the Garmin Instinct® E – 40 mm?
The Garmin Forerunner® 265S suits wrists around 44–60mm wide, and the Garmin Instinct® E – 40 mm around 42–57mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Garmin Forerunner® 265S and Garmin Instinct® E – 40 mm side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.
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