Garmin · 2009
Forerunner 405CXSize, Dimensions & Wrist Fit
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
The Forerunner® 405CX in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Rated for 2 weeks of use per charge.
- Water rated to IPX7.
- 60g on the wrist.
- 1.06" (2.7 cm) diameter display.
Does the Forerunner 405CX fit your wrist?
Drag the slider to your wrist width and see the Forerunner 405CX overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Measure at the point where you wear your watch — typically just below the wrist bone.
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
No watches selected
and it will be drawn on your wrist, to scale.
Happy with the fit? Check current availability for the Forerunner 405CX.
Check offerForerunner® 405CX battery life
The runtime the manufacturer publishes for everyday use.
- Smartwatch2 weeks
How the Forerunner® 405CX ranks on battery
Against the 296 Garmin watches in our database, ranked on each figure Garmin publishes.
- Everyday use14 days#151 of 285
- GPS tracking8 hours#255 of 267
Forerunner® 405CX specifications
The figures that decide a purchase, followed by every line Garmin publishes.
- Battery life
- 2 weeks in power save mode; 8 hours in training mode
- Display
- 1.06" (2.7 cm) diameter
- Resolution
- 124 x 95 pixels
- Water rating
- IPX7
Full specification sheet
26 published lines across 8 groups, unedited
Overview
- Family
- Garmin
General
- Dimension
- 1.88" x 2.78" x 0.646" (4.8 x 7.1 x 1.6 cm)
- Battery Type
- rechargeable lithium-ion
- Battery life
- 2 weeks in power save mode; 8 hours in training mode
- Display Size
- 1.06" (2.7 cm) diameter
- Water rating
- IPX7
- Display resolution
- 124 x 95 pixels
Sensors
- GPS
Additional
- Additional
- Watch functions include dual time, date and alarm. Garmin Connect is compatible with Windows® XP or newer and Intel-based Mac running OS 10.4 or later with Safari.
Product Info
- Main SKU
- 010-00658-30
- Product ID
- 31859
- Product Name
- Forerunner® 405CX
- Release Date
- 4/2/2009
- Product Variation
- Forerunner® 405CX
Maps & Memory
- History
- 1000 laps
- Navigation Routes
- 0
- Waypoints/favorites/locations
- 100
Cycling Features
- Courses
- Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)
- Yes (for advanced workouts only)
Training, Planning and Analysis Features
- Auto scroll
- Virtual Partner
- Advanced workouts
- Interval training
- Customizable data pages
- Auto Pause® automatic timer halt
- Auto Lap® interval tracking feature
Alternatives to the Forerunner® 405CX
Watches that cover a similar amount of wrist, with the measurements that separate them.
Garmin
Fenix 9 Pro inReach Solar 47mm
- Width
- 47mm
- Thick
- 15.8mm
- Weight
- 84g
Garmin
Fenix 9 Pro 43mm
- Width
- 43mm
- Thick
- 13.3mm
- Weight
- 62g
Garmin
Fenix 9 Pro inReach 47mm
- Width
- 47mm
- Thick
- 13.8mm
- Weight
- 78g
Garmin
Fenix 9 Pro inReach 43mm
- Width
- 43mm
- Thick
- 13.3mm
- Weight
- 62g
Garmin
Fenix 9 51mm
- Width
- 51mm
- Thick
- 14.7mm
- Weight
- 91g
Garmin
Fenix 9 Pro Solar 51mm
- Width
- 51mm
- Thick
- 16.6mm
- Weight
- 102g
Forerunner® 405CX — Frequently Asked Questions
How long does the Garmin Forerunner 405CX battery last?
Garmin rates it at 2 weeks per charge in everyday use.
How does the Garmin Forerunner 405CX battery compare with other Garmin watches?
At 14 days in everyday use it ranks #151 of the 285 Garmin watches in our database — below the middle of the range. The full ranking, including GPS and power-saving figures, is on our Garmin battery life comparison.
