Question about HP 12c Calculator

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Incorrect claculation I have an old HP 12c (10 years) and I noticed today that the TVOM calculations do not agree with calculation done in excel or open office. I believe the calculator is returning an incorrect value. For example, assume a PV of 12,000, annual interest off 6.34% (monthly i of .005283), and a period of 36 months. Excel returns a pmt of ($366.91). The calculator returns a pmt of ($333.64). Is this calculator shot? Or could it be that it just needs batteries?

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Re: incorrect claculation

I get an answer of 366.91 in my 12C as well. You might try either putting in a zero for FV before hitting the [PMT] key, or clearing your registers before doing the problem, as you may be picking up an old value from a previous problem in the FV register.

Posted on Jan 30, 2008

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How to calculate mortgage pmt using hp. I cannot remember the sequence

There is an excellent computer-based tutorial for the HP 12c Platinum on HP's website (although the sequence for TVM calculations is the same for the original 12c).
Download it and have a look. It will guide you key-by-key through the steps.


May 08, 2014 | HP 12c Calculator

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I have an old 12C HP calculator that uses 3 button batteries. Who sells these in Sydney ?

LR44 or equivalent batteries should be available at just about any electronics store. There are about a dozen Sydneys in the world, is there a Radio Shack store nearby?

Jul 24, 2011 | HP 12c Calculator

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Purchased the new anniverary version and after about 9 months it just would not turn on , previous units lasted about 10 years at 99 .00 dollars i need to fix this one

Having gone over half a year without a response to my query, I assume a new set of batteries solved the problem.
The Anniversary Edition 12C uses a much faster processor than the original 12C. The new processor also uses more current, and thus you won't get battery life as long.

Jul 15, 2011 | HP 12c Calculator

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If log 1000 = 3, how do I do this with my hp 12c calculator

The 12C does not have the common logarithm function built-in, but you can calculate it using the natural logarithm function (the blue g shift of the %T key, 2nd row, 3rd key).

The common logarithm of x is the natural logarithm of x divided by the natural logarithm of 10, or
log x = ln x / ln 10

Press 1 0 0 0 g [LN] 1 0 g [LN] /
and you'll get the result 3.

Jun 06, 2011 | HP 12c Calculator

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Have installed new battery and find all calculations incorrect. Must the calculator be re booted or calibrated and if so how can this be done ??


Jan 24, 2011 | HP 12c Calculator

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I am currently studying for the CFA Level I exam, during which only two calculators can be used: the TI BA Plus II and the HP 12C (or 12C Platinum. I've decided that I want to go with the HP 12C for a...

Personally, I'd go with the regular, or the Plus, staying away from the Platinum. There's nothing on the calculator or package to distinguish the Plus from the regular, but the Plus uses two coin batteries while the regular uses three button batteries. The Plus is just like the regular, except a LOT faster.

Dec 31, 2010 | HP 12c Calculator

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If changing battery doesn't power up HP 12c...what whould be the next option to check?

The same thing happened to me today. Try performing a hard reset (small hole near battery). Worked for me.

Oct 06, 2010 | HP 12c Calculator

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How can i tell the difference b/w hp12c and hp12p. i bought a hp12p from ebay(it's a stupid decision, I know!) and when i solving for IRR, i felt its running quite slow. I think the guy sold me the hp12P...

I couldn't find any reference to a HP calculator model 12p.
There is a HP 12c financial calculator and a 12c Platinum financial calculator.
Check both models (for images, specifications, functions, user guides, etc.) :
HP 12c Financial Calculator
HP 12c Platinum Financial Calculator

Aug 06, 2009 | HP 12c Calculator

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