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I go for the calculator (rather than phone) for ease of use. By the time I get my phone awake, PIN entered, or biometric scan, and swipe to an App; my Casio has already found the hex for 1048658.
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The number you really want is 12648430 ... ![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I still use my Casio fx-260 solar on occasion but more likely to use Windows calculator.
The most expensive tool is a cheap tool. Gareth Branwyn
JaxCoder.com
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I frequently pull out my cell phone for this purpose. I have a RPN calculator on it. I also use the Windows calculator if I'm at my laptop.
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Found an emulator for my old HP 41CX on it. Still have the CX (batteries out, of course), but only use the phone anymore.
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How far back in history do you have to go to find anyone under 30 who knows what is meant by "RPN"?
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Would have said me, but, well, I'm not under 30...
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I'm not 30 yet
And not only do I know the meaning but I also used it for a while 
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"Really Perplexing Notation?" 
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I was pretty sure it would be just you but a few other old farts people replied saying they also use calculators.
Anyway, I don't even have one, so depending on whether I'm using the Android phone or Windows PC, I use an app. For Windows, just the inbuilt app. For Anroid, I use Realcalc.
Cheers,
Vikram.
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RealCalc is my favorite Android calculator as well. I have mine set to RPN.
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I'll use something electronic for the decimal to hex thing, but pencil and paper for most other calculations.
I'm almost a luddite programmer. Was dragged kicking into the smartphone era.
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
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If I'm away from my desktop I use RealCalc on my phone. At my desktop I use the Ubuntu calculator program.
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I keep an Excel workbook open to do quick calculations which lets me put notes with it and save for later reference. I haven't used a hand-held calculator in > 20 years!
"Go forth into the source" - Neal Morse
"Hope is contagious"
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For simple things I may just type it into an open SQL file in SSMS.
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I hear you. My 80's Radio Shack Programmer's Calculator includes a stopwatch and a lap counter; faster than adding timing code for gauging response times.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Me too. My trusty Radio Shack EC-4075 Programmer's Hex and Time calculator has been by my monitor since that monitor was a DEC VT-62.
Before the office closed, the young 'uns would look sideways when I would pick it up.
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If my dear old HP48SX didn't have a buggered screen, I'd use that. Now, I use PCalc on my phone. All hail RPN.
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I know what you mean, I keep a Casio fx?? in my case and use it when doing Resistance calculations, frequency / lenght of antenna calcs, I tend use Excel when capacitance needs to be calculated due to very large and very small numbers needed. I suppose it comes from Exams when you were only allowed a calculator. The new Casio's employ a method of Visually Perfect Maths, doing it in the right order. Just seems wrong, found the last few FX992's that I had at Uni (before it got lost in celebrations of the last Control exam was over) available at Maplin (I miss them) on clearance.
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And how often do you need to do a decimal to hex conversion these days?
Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP
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Not often. I'm debugging/modifying a device driver right now, which has lead to some hex to decimal conversions. Even though most projects don't need hex conversions, I still reach for the calculator for simple math problems.
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Frequently.
Or binary/hex conversion. Last week I needed to double-check that I had the correct hex values for decoding UTF-8 characters.
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I have Microsoft Calculator on my taskbar. It is perfect for smaller calculations. For larger, more involved tasks I use a Canon MP11DX which allows me to print a paper tape, so I can check what I have done, in case I "Fat-Fingered" something, or lose my place.
I would say use what you are most comfortable with. 
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I still prefer having a calculator lying on my desk, even if it is a basic non-scientific one.
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Hey! I got same calculator. Still works.
Nothing succeeds like a budgie without teeth.
To err is human, to arr is pirate.
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