Guide
Casio F-91W Explained: Features, Battery & Best Alternatives
What the Casio F-91W does, its battery and water resistance, the colour variants — and the Casio vintage and digital watches to consider instead.
The Style2Have Edit · 27 September 2026 · 2 min read
The short answer: the Casio F-91W is Casio’s simple resin digital watch — a 1/100-second stopwatch, a daily alarm, an hourly time signal, an auto calendar and 12/24-hour time. The black F-91W-1 is listed with a CR2016 battery rated at about 7 years and a micro light. It’s water resistant, not a swimming watch — for that, choose a Casio with a depth rating (below).
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What the F-91W does
| Feature | F-91W |
|---|---|
| Stopwatch | 1/100 second |
| Alarm | Daily alarm, plus an hourly time signal |
| Calendar | Auto calendar |
| Time format | 12 or 24 hour |
| Light | Micro light (F-91W-1 listing) |
| Battery | CR2016, about 7 years (F-91W-1 listing) |
| Water | “Water resistant” — no depth rating given |
From the F-91W listings on this page.
Is the F-91W waterproof?
No. The listings describe it as water resistant but give no depth rating — so don’t take it swimming. If you want to wear a digital Casio in the pool, the W-59 is listed at 50 m, and the W-800H and AE-1200WH at 100 m.
F-91W versions
The classic is the black F-91W-1. Casio also makes colour and finish variants — the model code at the end of each listing (F91WM, F91WB, F91WPC and so on) tells you which one you’re looking at.
Casio F-91W and variants
All Casio
F-91W alternatives
Want a metal band? Casio vintage
For the same retro digital look on a stainless steel band, look at the A158WA and A168WA — the A168W is Casio’s Illuminator version, and the A158WA listing includes an LED light, daily alarm and stopwatch. The A700W and the women’s LA670WA are other vintage-style digital options.
Casio vintage steel-band digital watches
All watches
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Want more features? Step up
| Model | What it adds (per listing) |
|---|---|
| W-59 | 50 m water resistance; CR2016 battery about 7 years; micro light |
| W-800H | 100 m water resistance; 10-year battery; LED backlight; 37 g, 44.2 × 36.8 × 13.4 mm |
| AE-1200WH | 100 m; world time and world map; countdown timer; multiple alarms; 10-year battery |
| CA-53W | A built-in calculator |
| G-SHOCK DW-5600 | Casio’s G-SHOCK line, in the classic square case (48.9 × 42.8 × 13.4 mm) |
Casio digital watches with more features
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Casio W800H-1B Black Band Unisex Adult Digital Watch, Black Dial, 44.2 × 36.8 × 13.4 mm
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CASIO
Casio G-SHOCK Men's DW5600UBB-1D Digital Watch, Black, 48.9 x 42.8 x 13.4 mmQuick answers
What battery does the Casio F-91W use?
The F-91W-1 listing names a CR2016 coin cell, rated at about 7 years.
Can you swim with a Casio F-91W?
It isn’t sold as a swimming watch — the listings say “water resistant” with no depth. For swimming, look for a depth rating such as 50 m (W-59) or 100 m (W-800H, AE-1200WH).
What’s the difference between the F-91W and the A158WA?
Both are simple Casio digital watches. The F-91W has a resin case and strap; the A158WA has a stainless steel band.
Does the F-91W have a light?
Yes — the F-91W-1 listing describes a micro light. For a brighter backlight, the Illuminator and W-800H list LED lights.
