# What is the smallest and lightest digital watch available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the smallest and lightest digital watch available?

## Products

### Casio LF-30W
```yaml
product: casio-lf-30w
brand: Casio
price_gbp: 22.07
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: LF-30W
backlight: LED amber
battery_life: 3
```

- **Price:** £22.07 [^1]
- **Summary:** The Casio LF-30W is a compact 23 g digital watch with world time, a stopwatch, countdown timer, five daily alarms, an LED backlight, and a bio-based resin band. It suits everyday wear and travel, especially for people who want many practical functions in a lightweight watch.
- **Ideal For:** The LF-30W specifically suits someone seeking a small and light digital watch because its case measures 37.8 x 33.7 x 8.6 mm and it weighs only 23 g, while still providing world time, alarms, timers, and an LED backlight.
- **Additional Sources:** [^2]

### Casio LF30W-1A
```yaml
product: casio-lf30w-1a
brand: Casio
price_gbp: 22.34
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: LF30W-1A
backlight: LED amber
battery_life: 3
water_resistance: 3
```

- **Price:** £22.34 [^1]
- **Summary:** The Casio LF30W-1A is a compact, lightweight digital watch weighing 23 g, with world time, a stopwatch, countdown timer, five daily alarms, an LED backlight, and a bio-based resin band. It suits everyday wear and travel, especially for people who want many functions in a small, simple watch.
- **Ideal For:** This watch suits someone seeking a small and light digital watch because its case measures 37.8 × 33.7 × 8.6 mm and it weighs only 23 g, while still providing world time, alarms, a timer, and an LED backlight.
- **Additional Sources:** [^3]

### Casio A158WA-1
```yaml
product: casio-a158wa-1
brand: Casio
price_gbp: 28.05
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: A158WA-1
backlight: LED light
battery_life: 7
```

- **Price:** £28.05 [^4]
- **Summary:** The Casio A158WA-1 is a compact, lightweight digital watch with a stainless steel band, green LED light, daily alarm, hourly signal, auto-calendar, and 1/100-second stopwatch. Its 46 g weight and slim 8.2 mm case suit people who want a practical retro watch for everyday wear.
- **Ideal For:** At 46 g with a compact 36.8 × 33.2 × 8.2 mm case, the A158WA-1 is a strong fit for someone seeking a small and light digital watch, while its LED light and 7-year battery add everyday practicality.
- **Additional Sources:** [^5], [^6]

### Casio F-91W-3
```yaml
product: casio-f-91w-3
brand: Casio
price_gbp: 34.37
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-91W-3
backlight: LED light
battery_life: 7
water_resistance: 3
```

- **Price:** £34.37 [^7]
- **Summary:** The Casio F-91W-3 is a compact, lightweight digital watch with a resin case and band, LED light, stopwatch, alarm, calendar, and water resistance. Its simple design and long battery life suit everyday wear, sports, travel, and users who want an affordable, low-maintenance watch.
- **Ideal For:** It suits the search for the smallest and lightest digital watch because its compact 38.2 × 35.2 × 8.5 mm case weighs just 21 g while still providing a digital display, LED light, stopwatch, alarm, and 7-year battery life.

### Casio F-B100W
```yaml
product: casio-f-b100w
brand: Casio
price_gbp: 40.6
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-B100W-1A
backlight: Green LED
battery_life: 2
```

- **Price:** £40.6 [^8]
- **Summary:** The Casio F-B100W is a lightweight digital watch with Bluetooth smartphone connectivity, step tracking, automatic time adjustment, an LED backlight, stopwatch, timer, and five daily alarms. Its slim 8.8 mm resin case and 26 g weight suit everyday wearers who want basic fitness features without charging.
- **Ideal For:** It suits someone seeking a very small and light digital watch because it weighs only 26 g, measures 8.8 mm thick, and retains a simple digital display with a long-lasting replaceable battery.

### Casio GMA-P2100
```yaml
product: casio-gma-p2100
brand: Casio
price_gbp: 59.0
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: GMA-P2100
backlight: Double LED light
battery_life: 3
water_resistance: 20
```

- **Price:** £59.0 [^9]
- **Summary:** The Casio GMA-P2100 is a compact analog-digital G-SHOCK with shock resistance, 20 ATM water resistance, and a double LED light. Its 40 g resin construction and shorter band make it well suited to smaller wrists and everyday sports use.
- **Ideal For:** It suits the search for the smallest and lightest digital watch because it weighs 40 g, measures 40.2 × 46 × 11.2 mm, and includes a digital display in a compact shock-resistant case.
- **Additional Sources:** [^10], [^11]

### Casio F-201WA-9AEF
```yaml
product: casio-f-201wa-9aef
brand: Casio
price_gbp: 1424.82
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-201WA-9AEF
backlight: LED backlight
battery_life: 10
```

- **Price:** £1424.82 [^12]
- **Summary:** The Casio F-201WA-9AEF is a lightweight digital watch with an LED backlight, five alarms, a stopwatch, countdown timer, dual time, and a full auto-calendar. Its 10-year battery life and simple resin design suit everyday wear and users who want practical features without frequent battery changes.
- **Ideal For:** It suits the search for the smallest and lightest digital watch because its compact 41 x 34 x 10.5 mm case weighs only 23.5 g while still providing an LED backlight and multiple digital functions.

### Casio G-5600
```yaml
product: casio-g-5600
brand: Casio
price_gbp: 11714.51
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: G-5600UE-1JF
backlight: LED backlight (Super Illuminator)
water_resistance: 20
```

- **Price:** £11714.51 [^13]
- **Summary:** The Casio G-5600UE-1JF is a shock-resistant digital watch with Tough Solar charging, a classic square resin design, 20 ATM water resistance, and a full-auto LED backlight. It suits people who want a durable, sporty everyday watch with low-maintenance solar power.
- **Ideal For:** It is a compact 51 g digital watch measuring 46.7 x 43.2 x 12.7 mm, making it a practical lightweight option for someone seeking the smallest and lightest digital watch available.

### Casio F-84W
```yaml
product: casio-f-84w
brand: Casio
price_gbp: 1439.58
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-84W-1QJH
backlight: LED light
battery_life: 7
```

- **Price:** £1439.58 [^14]
- **Summary:** The Casio F-84W is a compact retro digital watch with an LED light, stopwatch, alarm, resin case, and resin band. Its simple functions and daily-use water resistance suit people who want an affordable, lightweight everyday watch.
- **Ideal For:** It suits someone looking for the smallest and lightest digital watch because it has a compact 38.7 x 33.4 x 8.5 mm case and weighs only 21 g.

### Casio BGD-565
```yaml
product: casio-bgd-565
brand: Casio
price_gbp: 43.05
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: BGD-565
backlight: Electro-luminescent backlight
battery_life: 2
water_resistance: 10
```

- **Price:** £43.05 [^15]
- **Summary:** The Casio BGD-565 is a compact, shock-resistant digital BABY-G watch with 100-meter water resistance, a white LED backlight, stopwatch, countdown timer, alarm, and full auto-calendar. Its durable 30 g resin design suits active users and smaller wrists.
- **Ideal For:** With a 42.1 × 37.9 × 11.3 mm case and 30 g weight, the Casio BGD-565 is a compact and lightweight choice for someone seeking one of the smallest and lightest digital watches.
- **Additional Sources:** [^16], [^17]

### Casio F-91WG-9Q
```yaml
product: casio-f-91wg-9q
brand: Casio
price_gbp: 25.1
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-91WG-9Q
backlight: Green LED light
battery_life: 7
water_resistance: 3
```

- **Price:** £25.1 [^18]
- **Summary:** The Casio F-91WG-9Q is a slim, lightweight digital watch with a 1/100-second stopwatch, daily alarm, hourly signal, calendar, and green LED light. Its resin case and band, 21 g weight, and seven-year battery make it well suited to everyday wear and active use.
- **Ideal For:** It suits someone seeking the smallest and lightest digital watch because its compact 38.2 × 33.2 × 8.5 mm resin case weighs only 21 g while still providing essential digital-watch features.

### Casio F-91W
```yaml
product: casio-f-91w
brand: Casio
price_gbp: 515.79
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
brand: Casio
model: F-91W
backlight: LED light
battery_life: 7
water_resistance: 3
```

- **Price:** £515.79 [^19]
- **Summary:** The Casio F-91W is a slim, lightweight digital watch with an alarm, stopwatch, calendar, LED light, and water resistance for everyday splashes and rain. Its simple design and long battery life suit people who want an affordable, practical watch for daily wear, sports, travel, or work.
- **Ideal For:** It suits the search for the smallest and lightest digital watch because it weighs about 21 g, has an 8.5 mm slim profile, and includes practical digital features without added bulk.

### Casio F-105W
```yaml
product: casio-f-105w
brand: Casio
price_gbp: 97.45
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
backlight: Electro-luminescent
battery_life: 7
```

- **Price:** £97.45 [^20]
- **Summary:** The Casio F-105W is a lightweight digital watch with an electro-luminescent backlight, daily alarm, hourly time signal, automatic calendar, and 1/100-second stopwatch. Its resin case and 21 g weight suit everyday wear, especially for people who want a simple, low-maintenance watch.
- **Ideal For:** At 21 g with a compact 39 × 35.4 × 9.6 mm case and digital display, the Casio F-105W is well suited to someone seeking a small and light digital watch.

---
## References & Sources
[^1]: NYWatchStore, accessed 2026-09-13. https://www.nywatchstore.com/casio-watch-lf30w-1a.html
[^2]: H.Samuel, accessed 2026-09-13. https://www.hsamuel.co.uk/casio-lf30w-digital-black-square-dial-strap-watch/p/V-1084227
[^3]: AllTime, accessed 2026-09-13. https://www.alltime.ru/watch/casio/LF-30W-1A/720096/
[^4]: Jebsen Casio Online Store, accessed 2026-09-13. https://shopcasio.jebsen.com/en/a158wa-1.html
[^5]: Watch Direct, accessed 2026-09-13. https://watchdirect.com.au/products/casio-a158wa-1-stainless-steel-digital-mens-watch
[^6]: Shopping in Japan, accessed 2026-09-13. https://www.shoppinginjapan.net/a158wa-1
[^7]: Kogan, accessed 2026-09-13. https://www.kogan.com/au/buy/monster-trading-store-casio-watch-vintage-retro-f-91w-3-f91-f91w-f-91-cas-f-91w-3d/
[^8]: Casio UK, accessed 2026-09-13. https://www.casio.com/uk/watches/casio/product.F-B100W-1A/
[^9]: Ocarat, accessed 2026-09-13. https://ocarat.com/en/tone-on-tone-watch-gma-p2100-gma-p2100-7aer-casio-g-shock-109343.html
[^10]: TimeShop24, accessed 2026-09-13. https://www.timeshop24.es/casio-gma-p2100-7aer-g-shock-classic.html
[^11]: World Time, accessed 2026-09-13. https://world-time.es/gb/catalogo/1721-gma-p2100-7aer.html
[^12]: Prom.ua, accessed 2026-09-13. https://prom.ua/Chasy-neubivaemye.html
[^13]: IPPO JAPAN WATCH, accessed 2026-09-13. https://www.ippojapanwatch.com/ja/products/casio-mens-g-shock-solar-powered-20-bar-water-resistant-g-5600-series-g-5600ue-1jf
[^14]: IPPO Japan Watch, accessed 2026-09-13. https://www.ippojapanwatch.com/products/casio-f-84w-1qjh-standard-watch
[^15]: Ormoda, accessed 2026-09-13. https://ormoda.com/us/brands/casio-g-shock/casio-baby-g-bgd-565.html
[^16]: Gadgeticloud, accessed 2026-09-13. https://gadgeticloud.com/products/casio-bgd-565u-4er-shock-and-water-resistant-bgd-565-series-watch
[^17]: Rozetka, accessed 2026-09-13. https://bt.rozetka.com.ua/604589785/p604589785/
[^18]: StockX UK, accessed 2026-09-13. https://stockx.com/en-gb/casio-mens-black-digital-watch-with-gold-dial-f-91wg-9q-gold
[^19]: Broadway Jewellers, accessed 2026-09-13. https://broadwayjewellers.co.za/products/02f6cd34-4c0a-11eb-ecfb-b7549afd30f7
[^20]: Desertcart, accessed 2026-09-13. https://www.desertcart.com.sa/products/659626656-casio-f-105w-1a-vintage-illuminator-classic-digital-watch-el-backlight-1-100-second-stopwatch-daily-alarm-7-year-battery-water-resistant-unisex