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Compare 3 products

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Casio FX-991DE X Calculator
Casio FX-991DE X
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Casio FX-991ES Plus Calculator
Casio FX-991ES Plus
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Casio FX-991EX Calculator
Casio FX-991EX
Available colors
User rating
65
3.6 out of 5
65 user ratings
5 stars
24 %
4 stars
30 %
3 stars
30 %
2 stars
9 %
1 stars
4 %
298
3.4 out of 5
298 user ratings
5 stars
22 %
4 stars
19 %
3 stars
36 %
2 stars
16 %
1 stars
5 %
318
3.3 out of 5
318 user ratings
5 stars
20 %
4 stars
18 %
3 stars
42 %
2 stars
12 %
1 stars
5 %

Technical details

TypeScientific calculatorScientific calculatorScientific calculator

Design

Colour of productBlack
  • Grey
  • Violet,White
  • Black
  • Black,White
Control typeButtonsButtonsButtons
Form factorPocketPocketPocket
Coveryesnono
Digit comma separator
N/A
yesyes

Dimensions

Width3.03 in3.15 in3.03 in
Height0.44 in0.44 in0.44 in
Depth6.52 in6.38 in6.52 in
Weight3.17 oz3.35 oz3.17 oz

Display

Number of display lines242
Display typeLCDDot-matrixLCD
Display tiltingnoyesno
Second displaynonono
Display lightnonono
Number of characters per line
N/A
1516

Connectivity

Data transfernonono

Power

Power source
  • Solar
  • Battery
  • Solar
  • Battery
  • Solar
  • Battery
Battery operatedyesyesyes
Battery typeLR44LR44LR44
Number of batteries required111
External power connection
  • External source
  • Solar cell
  • Solar cell
  • USB
  • External source
  • Solar cell
  • External source
Auto power off
N/A
yes
N/A

Often compared with Casio FX-991DE X

Often compared with Casio FX-991ES Plus

Often compared with Casio FX-991EX