Tuesday, March 28, 2017

Review: Casio fx-260 Solar II (fx-82 Solar II)

Review:  Casio fx-260 Solar II (fx-82 Solar II)

 Company:  Casio
Year:  2017
Type:  Scientific
Power:  Solar
Statistics: 1 Variable
Operating System:  AOS (classic)
Cost:  $8.99

So New?

Ironically, I was not able to find the fx-260 Solar II online, but saw it on a very rare trip to WalMart.  The Casio fx-260 Solar II calculator is so new that still isn’t featured on the Casio’s website (as of 3/27/2017). 

As a note:  The fx-260 is the name for the version sold in the United States.  Internationally, the calculator is known as the fx-82 Solar II, and Casio does have that calculator on its website:

An Update of a Classic
fx-260 Solar original on the left, fx-260 Solar II on the right  (named fx-82 Solar (II) internationally)

The fx-260 Solar II is an update of the very classic (and still selling) Casio fx-260 Solar (outside the United States, it’s the fx-82 Solar).  Functionally, the fx-260 Solar II is the same as the classic fx-260.  As a reminder:

* Trigonometric functions
* Angle conversions: polar, rectangular, to degrees (Shift Mode 4), to radians (Shift Mode 5), and to grads (Shift Mode 6)
* Random numbers
* Logarithms and exponents
* 1 Variable Statistics
* Fractions (up to a maximum of 10 digits between the whole, numerator, and denominator parts)
* DMS/Decimal math and conversions

Pretty handy for a basic scientific calculator.  The fx-260 Solar II, like its predecessor runs entirely on solar and light power, hence a completely green calculator.  50 lux is required.

There is a NF version which was stated on the quick manual that came with the fx-260 Solar II.  The NF stands for “no fraction” and the diagram shows the fraction button [ a b/c ] button disabled.

The percent key still works the same as the predecessor.  The keystrokes:

Find N% of W:   W [ * ] N [Shift] [ = ] (%)

W is N% of the whole:   W [ ÷ ] N [Shift] [ = ] (%)

Markup/Tax:   W [ * ] N [Shift] [ = ] (%) [ + ]

Discount:  W [ * ] N [Shift] [ = ] (%) [ - ]

The differences between the fx-260 Solar II are:

The back of the fx-260 Solar II

1.  The processor is faster, most noticeable when try to calculator n! when  50 < n < 69.  In reality, it can be seen as negligible since the predecessor is no slow poke. 
2.  The fx-260 Solar II is has a more compact design than the original fx-260 Solar.  The fx-260 Solar II is close to a size of an iPod Touch/iPhone.  Per the manual, the dimensions of the fx-260 Solar II are 3/8” height, 2 3/4” width, and 4 3/4” depth. 
3.  The one difference I’m not a fan of is how the mode reminders are moved to the back of the calculator.  Furthermore, the reminders are white text on a white background.  It is only because of the etching that the reminders could be readable. 

Easter egg: I think this is the first time Casio dated their manual (2017). 

Final Verdict

If you are fan of small calculators, solar calculators, Casio, basic level scientific calculators, or just want something nice to add to your collection, then the fx-260 Solar II (and the original fx-260 Solar) is a nice pick up for not much money.


This blog is property of Edward Shore, 2017.


  1. Can I use this in place of TI-83 or 84 plus?

    1. Only if you don't need/want a graphing calculator.

    2. can you type negatives and if so how

    3. To type negative numbers, press the change sign key [+/-] after you enter the number. Example: -20 is achieved by pressing [ 2 ], [ 0 ], [ +/- ]

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  4. Is this calculator allowed on the Algebra 2 EOC? I'm guessing it is since the fx-260 is allowed, and the fx-260 II is basically the same thing, but I need a definite answer, so I know buying it wasn't a waste of money.

  5. Great review Eddie. I too just saw this by accident at Walmart for $7, as they often go on sale after school and get expensive just before school starts. So if you want want, now is the time.

    Some added review items worth mentioning:

    Overall improvement in ergonomics from a calculator already unique for its ergonomics: sensitive enough to work in artificial light alone without batteries, good tactile feel, just the right functions available, fast response, small and light, durable make, my older ones still look new and are over 10 years old

    The new design is inspired by the FX-991EX in the mettalic like finish to the top of the calculator, the white cover and body, the sculpted key and color BLUE for RED on AC and C.

    Its physically smaller and lighter but its generally as if you took out MODE labels and shortened it accordingly. It fits even better now in a shirt pocket during lab runs.

    The LCD is far more reflective on mine, and I bought two, with marked improvement in contrast.

    The case is much shorter travel, so it only takes a small thumb swipe and its out, the flip it on its back, and slip back into the case takes a lot less movement than the older one.

    The FX260 has been my general purpose scientific calculator for over 18 years since its inception, as my workhorse calculators. They are so cheap I have about 6 scattered throughout my offices, labs and workbags. I never expected it ever to be updates but there it is!

  6. Could you do me a favor. Test the new one “355 [a b/c] 226 [tan]” on RAD mode, then see what you got.

    1. -749793.067

      (355/226 is close to pi/2, 355/226 = 1.57079646, where pi/2 = 1.570796327)


    2. Thx, Eddie, It's the same with the old one (-7497938.067). The precision of new model was not improved, even the same with more older model, like fx-82SX, fx-250HA, fx-350HB, fx-65...

  7. Is this a programmable calculator?

  8. Help. I seem unable to enter negative data in statistics mode. Can you offer any help?

  9. Hi,
    I have a question: is there any solar powered calculator which can store programmed function in memory? (I wish to have programmable calculator with solar power) :)

    1. I like programmable calculators powered by solar power. The two that are currently sold are the Casio fx-3650P and the Casio fx-50F II. Unfortunately, those two calculators are not sold in office stores in the United States, so you will need to use eBay or another online site. Both models have 4 program areas, the fx-3650P has 360 bytes while the fx-50F II has 680 bytes and an extended programming language. The fx-3650P has numerical derivatives and integrals, while the fx-50F II has 23 built in formulas.

  10. Very nice review. One question though is version II keys are rubber buttons like the previous model?

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  12. Casio has always dated their manuals. The date ( year and month) appear after the letters SA. For example in your manual SA16-11 means revision year 2016, month 11 (this is the first release). On my fx-991ES Plus manual, it says SA09-07A, which means revision year 2009 month 7 (The calculator was released in 2008).

  13. Is there a digital version of this calculator available?

  14. Edward, Just curious. Do you know when the Casio fx-260 Solar original was first introduced? I seem to have had mine for years but can find nothing online as to when it came out.

    Best regards,
    Steven H.


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