## Kindle DX is a Calculator

Looks like I’ve found a new Easter Egg in Kindle DX. I’ve just tested my Kindle 2 and it doesn’t seem to do the trick with 2.0.3 software.

If you type mathematical expression like 2+2 in the search box on the home page the result shown would be result of this expression. See screenshot:

I’ve played around with it and it seems to support following operations:

- Basic math: plus, minus, multiplication, division, power (^) and square root (sqrt)
- Parenthesis
- Trigonometry: sin, cos, tan, atan
- Division by zero yields infinity result (∞)

I found this by sheer chance as I was trying to use search to find one of the two hundred PDF files I’m testing Kindle DX with right now by a portion of it’s name (6-2-3). Turns out Kindle DX doesn’t index file names but it did tell me that 6-2-3=1 :)

It would be great for Amazon to also add currency conversion as part of this calculator.

Great, but inaccurate. 123456789 X 9 = 1111111101, not 111111111.

actually, it is accurate since there’s no 8 in the term he entered.

[…] At Blog Kindle, they’ve found that entering a mathematical expression into the search field on the home menu page, works like a calculator – […]

He didn’t have a digit 8 in the multiplicands, and indeed, 12345679 x 9 = 111111111

Very cool. Any idea how to get the DX to display the time? I remember Command+T working in the Kindle 1.

Actually just pressing “Menu” will show the time in the title bar.

Does it work with the Kindle 2?

I checked it and it doesn’t work with K2

On the Kindle 2, you can type your equation and, rather than hitting enter and searching, use the right on the 5-way to go to Google and select that. That will give you your answer. Of course, connectivity is required for that. I would assume any of the other Google functions also work (currency conversion, time, etc.).

Also, typing @t from the HOME screen

will get you date & time in a pop-up box

At the home page, press Enter key (below ‘Del’)

and then enter @t

and press Enter key again

Unfortunately you need the symbol key to do the @

but it’s just one up and one up to the right.

That combo doesn’t, so far, work in books but there’s likely

a way.

– Andrys

[…] Tip – Via Andrei Pushkin, how to turn your Kindle DX into a calculator. (My interview with Andrei in Episode […]

It now works with kindle update 2.33.

* Kindle2 in function calc ?

Dear All !

Now I get Kidle2 yesterday.And your tips used ..

I found function calc …

>> pi = ? –> Ans. 3.1415..

>> 20*log(10^3) = ? –> Ans. 60

It’s fun !!!!

** Yuji **