| Size | ★★ |
| Weight | ★★ |
| Functions | ★★★ |
| Materials | ★★★★ |
| Battery Years | ★★ |
| Price | ★★★★ |
GA-100 Model Range *may be updated
*Want to be the first to know about new G-Shock Updates? Here we store all recent Monthly G-Shock Updates →
Quick Content Guide
- GA-100 Model Range *in different colors and bands
- General information about the watch *year of first release, model range etc.
- G-Shock GA-100 Display Guide *for key functions only
- G-Shock GA-100 on the wrist! *only images and only on the wrist
- GA-100 Usage Patterns *what the watch is usually meant for
- Feedback from Users and Experts *anonymous from different sources
- GA-100 Limited Editions *unique style, materials, and price
- The most distinctive specs *from our Editorial point of view
- Other G-Shock GA Watches *similar by price and functions but different by cases
- Official GA-100 Specs *all details and for base version GA-100-1A1
- G-Shock GA-100 PROs & CONs *by experts with 10 years experience
- Famous people wearing G-Shock GA-100! *updates
- Japanese approaches to Tough and Functional Watches in GA-100 *the most distinctive features in details
- GA-100 Comparison Table *with similar G-Shock Watches
- Full Photo Gallery *various images
- Recent News about GA-100 *the latest breaking news and videos
About the Watch in short. A typical representative of the round cases G-Shock and the record holder for the number of all kinds of colors and stylistic options, for which it is popular with modern youth. The case belongs to the category of “large” – 55 mm in height and 51 mm in width. Impact resistance consists of characteristic “influxes” on the front part that protect the glass from direct impacts and a step strap with pin mounting. Large buttons are conveniently pressed thanks to the ribbed surface and are protected from accidental pressing. In addition to resistance to mechanical damage, the watch has protection against magnetic fields. Ana-DJ dial is an ideal combination of information content and ease of reading data. Despite the low price, the GA-100 is equipped with a very accurate stopwatch for 100 hours, a timer with auto-repeat, world time, an alarm clock and a simple speedometer that works in conjunction with a stopwatch [you must specify the distance in advance]. Auto backlight will be activated in the dark when the clock turns to face.
General Information
| Price | $70 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2010 |
| Suitable for Wrist Size | 150 – 230 mm |
| Module Number | 5081 / Manual |
| Model Range | GRAVITYMASTER (Developed in response to pilots’ needs, these tough watches offer improved accuracy, strength and practicality. Famous for unique and beautiful aviation design (usually analog) and advanced technologies.) |
| Battery Type | CR1220 (G-Shock Batteries) Buy Battery on Amazon → |
G-Shock GA-100 Display Guide *for key functions only. For you to know how it works))
General Display
- Press (C) to change from mode to mode.
- In any mode (except a setting mode), press (B) to illuminate the display.
Stopwatch
You can use the stopwatch to measure elapsed time, lap times and split times. If you specify a distance value, the stopwatch also will calculate and display speeds.
Countdown Timer
Press (D) while in the Countdown Timer Mode to start the countdown timer.
World Time
In the World Time Mode, use (D) to scroll through available city codes (time zones). Holding down the button scrolls at high speed.
G-Shock GA-100 on the wrist!
GA-100 Usage Patterns *what the watch is usually meant for
Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.
PROs
+ good visibility
+ cheap
+ amazing look
+ these watches though cumbersome to set are great to own. Very rugged and precise
+ the lume on this watch looks very good especially considering your in a lit room and it just blazes & although the digital sections aren’t lumed you can still see the face very clearly
+ for the price it’s unbeatable and it has everything you need
CONs
– weak illumination at night
– basic features
– the biggest deal breakers are the lack of lume and the poor case light that these models come with, but if you don’t really care about that, it’s a no brainer
– the hands should be lumed
Feedback from Experts *based on comparison info with similar watches by price, model range, etc.
PROs
+ hourly Time Signal
+ affordable price
+ 1/1000-second stopwatch
+ Auto-Back Light
+ Magnetic Resistance
CONs
– only 29 time zones
– only 2 years battery
GA-100 Limited Editions *unique style, materials, and price
The Listing of All G-Shock GA-100 Limited Watches → *with detailed description about the style
What we like in GA-100 *comments by experts with 10 years experience in writing about Casio watches
— 200-meter water resistance (good for swimming but not for deep diving)
— Speed measurement (if you know the distance, you will know the speed in your watch)
— ISO 764 class magnetic resistant (A magnetic-resistant plate is mounted on the module. The plate prevents magnetic fields from interfering with proper movement of the hands in daily use)
Other G-Shock GA Watches *similar by price and functions but different by cases
These are not all G-Shock GA Series. Here is a list of All G-Shock GA Watches →
Official Casio Description. Introducing a collection of new G-SHOCK models whose 35mm diameter faces and large cases give them a look of power and strength.
Dial rings and raised hour markers create three-dimensional depth that gives the face plenty of character.
The popular G-SHOCK three-dial face design incorporates one analog dial in the center, with digital dials on either side.
These watches are designed and engineered to deliver outstanding shock resistance and water resistance, as well as anti-magnetism.
Over-sized buttons come with a checkered anti-slip surface to make operations fast and sure.
1/1000-second stopwatch, velocity indicator, World Time, 5 alarms and much more provides these models with unmatched function and performance.
Official GA-100 Specs / Features *for base version GA-100-1A1
- Case / bezel material: Resin
- Resin Band
- Magnetic Resistant
- Shock Resistant
- Mineral Glass
- 200-meter water resistance
- LED light
Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow - World time
29 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping - 1/1000-second stopwatch
Measuring capacity: 99:59’59.999”
Measuring modes: Elapsed time, lap time, split time
Others: Speed (0 to 1998 units / hour), Distance input (0.0 to 99.9)
Mach indicator (speed exceeding 1225 units / hour) - Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat - 5 daily alarms (with 1 snooze alarm)
- Hourly time signal
- Full auto-calendar (to year 2099)
- 12/24-hour format
- Regular timekeeping
Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (speed)
Digital: Hour, minute, second, pm, month, date, day - Accuracy: ±15 seconds per month
- Approx. battery life: 2 years on CR1220
- Size of case : 55×51.2×16.9mm
- Total weight : 70g
G-SHOCK GA-100 PROs & CONs
*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!
– Best seller of all time (together with DW-5600)
– Very stylish look
– Millisecond stopwatch and speedometer
– Four large & functional LCD displays
– Large aluminum hour and minute hands
– No Solar Power (2 years)
– Only traditional functions (World time, Stopwatch, Timer, Alarms etc.). No advanced GPS or Pedometer, etc.
– No Radio Controlled Accuracy
– No Bluetooth
– No Second Hand
Famous people wearing G-Shock GA-100!
Have you seen this watch with another person? Let us know!
Enjoy Japanese Unique Fetures in GA-100!
*some images are about G-Shock 5000/5600 cases, but the technology, approaches, concepts and philosophy remains the same for the whole G-Shock Model Range
Hollow case structure. Based on a realization that “shocks are not transmitted inside a bouncing rubber ball,” the structure was designed to let the module float inside the case, relieving shocks transmitted from outside. Today, the module’s shock resistance is realized through further technical innovations. But the revolutionary tough structure that gave G-SHOCK its origin began here.
All-directional covering. If the watch is dropped, the protruding bezel fully enclosing it absorbs the shock, protecting the buttons directly connected to the module and alleviating shocks from all directions. The bezel also guards the surface of the crystal. The band is curved stiffly at the point of connection with the case, moreover, enabling it to serve as a shock absorber and prevent direct shocks to the back of the case.
Protective cushioning of key parts. The crystal oscillator and other critical parts inside the module are guarded individually by cushioning material. Any strong shock to the watch causes immediate distortion of the cushioning inside the module, preventing contact failure and malfunction.
Japan Quality. Constructed with genuine quality, CASIO products provide truly practicable applications in which functionality and beauty combine. The leading-edge LSI technologies and skilled craftsmanship that give life to CASIO watches exemplify the quality Japan boasts in the world marketplace.
For CASIO, “faith in manufacturing” refers to an inexorable advancement of digital technologies and an uncompromising commitment to fine craftsmanship. This faith engenders unparalleled performance that not only elevates CASIO watches as close as possible to perfection, but that actually changes their wearers’ lifestyles.
GA-100 Comparison Table with similar G-Shock Watches
GA-100 | |||
Price (Amazon) | |||
Year of first Release | 2016 | 2013 | 2012 |
Accuracy | ±15 seconds per month | ±15 seconds per month | ±15 seconds per month (with no signal calibration) |
SmartWatch Features | No | No | No |
Light | LED light (Super illuminator) | LED light | Neobrite (hands and hour markers) and LED light |
Alarm | 5 daily alarms (with 1 snooze alarm) | 5 daily alarms (with 1 snooze alarm) | 5 daily alarms |
Timer | Measuring unit: 1/10 second | Measuring unit: 1 second | Measuring unit: 1 second |
Stopwatch | 1/100-second stopwatch | 1/1000-second stopwatch | 1/100-second stopwatch |
Hourly Time Signal | Yes | Yes | Yes |
World Time | 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping | 29 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping | 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping |
Auto-Back Light | No | Yes | Yes |
Magnetic Resistance | No | Yes | No |
Case / bezel material | Resin | Resin | Resin / Aluminum |
Glass | Mineral Glass | Mineral Glass | Mineral Glass |
Battery | 5 years on CR2016 | 2 years on CR1220 | Solar powered CTL920 |
Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size | 57.5×53.4×18.4 | 55×51.2×16.9 | 52×46.4×14.9 |
Full features (if you want to know more) |
GA-100 Replacement Band (Strap) *availability
We think it is very important (before buying a new watch) to know if there will be some choice as for replacement bands for GA-100 (in future or even now). So we made a research and you shouldn’t worry about your future as the bands are available for buying.
starting from 34$ on eBay →
starting from 18$ on PacParts →
Recent News about GA-100
- [G-SHOCK 2023] GA-B001CY, GA-B2100CY and others — Caution Yellow Series
- [G-SHOCK 2023] DW-5600EU, DW-5900EU-8A4, GA-100EU-8A2 — Euphoria Series
- [G-SHOCK 2023] GA-2100RC and Others — Embellished with Metal Elements
- [G-SHOCK 2023] GA- 2100RGB and others — Gamers RGB Series
- [G-SHOCK 2023] Virtual Rainbow Series Pays Homage to Gaming Culture
You ask, we answer…
If you know the distance, you will know the speed in your watch.
A magnetic-resistant plate is mounted on the module. The plate prevents magnetic fields from interfering with proper movement of the hands in daily use.
STANDART ANA-DIGI (This Line includes Digital and Analog displays on G-Shocks that are the best in “price/quality” category. Usually have traditional digital functions, but with beautiful hands. Don’t worry, the hands won’t prevent you from seeing digits, since there is a special Hand Shift technology that moves them to the neutral position).
Not sure about GA-100? There are more G-Shocks!
how do i set my ga100
The most piece of shit watch I’ve ever owned. Constantly having to reset time.
Absolute trash. I reset it and the next day totally out of time. Right now a hammer to it seems great