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Compare 3 products

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Casio FX-991DE Plus Calculator
Casio FX-991DE Plus
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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
Available colors
User rating
59
4.0 out of 5
59 user ratings
5 stars
37 %
4 stars
32 %
3 stars
25 %
2 stars
5 %
1 stars
0 %
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 %

Technical details

TypeScientific calculatorScientific calculatorScientific calculator

Design

Colour of product
  • Grey
  • Silver
Black
  • Grey
  • Violet,White
Control typeButtonsButtonsButtons
Form factorPocketPocketPocket
Coveryesyesno
Digit comma separator
N/A
N/A
yes

Dimensions

Width3.15 in3.03 in3.15 in
Height6.38 in0.44 in0.44 in
Depth0.44 in6.52 in6.38 in
Weight3.35 oz3.17 oz3.35 oz

Display

Number of characters per line12
N/A
15
Display typeDot-matrixLCDDot-matrix
Display tiltingnonoyes
Second displaynonono
Display lightyesnono
Number of display lines
N/A
24

Power

Power source
  • Solar
  • Battery
  • Solar
  • Battery
  • Solar
  • Battery
Battery operatedyesyesyes
Auto power offyes
N/A
yes
Number of batteries required111
External power connectionSolar cell
  • External source
  • Solar cell
  • Solar cell
  • USB
  • External source
Battery type
N/A
LR44LR44

Often compared with Casio FX-991DE Plus

Often compared with Casio FX-991DE X

Often compared with Casio FX-991ES Plus