HP12C - Internal Rate of Return


I no longer have my owner's manual and now need to info on how to calculate IRR for irregular cash flows.


Initial investment $10000
Cash Flows: Year 1 $5000 Year 2 $4000 Year 3 $3000

Clear the financial registers.

10000 CHS g CFo
5000 g CFj
4000 g CFj
3000 g CFj




In addition to what Gene has said, if any consecutive set of cash flows are equal, you can use the Nj function to specify how many times the flow repeats. Extending on Gene's example, suppose that there were flows in years 4, 5, and 6 that were all equal to the $3000 flow in year 3, then instead of keying these in individually, you can just type "4 g Nj" just before the "f IRR" keystrokes. The 4 signifies 4 payments of $3000 corresponding to the four years (3, 4, 5, 6).

Apart from saving some keystrokes, this method also saves on memory registers. Basically, you only use one memory slot for a repeated flow. Somehow, the HP engineers have stored the value of Nj (which can be as large as 99) in some spare bits inside the calculator, probably in the bits in the memory register which holds the payment itself.


Quite correct!

One can also see an example from my business math textbook that uses the HP-12c...




You can download and read the manual of HP 12C Platinum at:


The way to use of HP 12C is mostly similar with HP 12C Platinum (in PRN mode).

Good luck!!!

Luc - Vietnam

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP Prime - GETPIX_P Return? Thomas Chrapkiewicz 7 1,743 11-25-2013, 08:54 AM
Last Post: Thomas Chrapkiewicz
  HP12c Present Value of $1.. Inaccurate??? Edward Dixon 12 2,598 11-12-2013, 11:32 AM
Last Post: Edward Dixon
  HP PRIME: Hide return value from program and swap Edit with Run vrrr 2 1,070 11-09-2013, 04:04 PM
Last Post: vrrr
  HP Prime Programming Tutorial #1: LOCAL, RETURN Eddie W. Shore 6 2,179 10-26-2013, 08:42 PM
Last Post: Miguel Toro
  Bug Bounty Programs Beat Internal Researchers Peter Murphy (Livermore) 0 693 07-12-2013, 06:59 PM
Last Post: Peter Murphy (Livermore)
  HP12C Platinum PC software activation fails Russell Clinton 0 820 07-02-2013, 02:32 PM
Last Post: Russell Clinton
  HP-67 internal function timings Dieter 3 1,072 02-10-2013, 05:18 PM
Last Post: Paul Dale
  HP12C Limited Edition 30 anniversary keyboard Revan Ng 0 674 01-11-2013, 12:49 AM
Last Post: Revan Ng
  [WP34s et al.] Solving the TVM equation for the interest rate Dieter 24 4,371 12-01-2012, 05:53 AM
Last Post: Paul Dale
  WP-34S return to HP-30B Mike Wilson 14 2,474 09-13-2012, 10:19 PM
Last Post: Tim Wessman

Forum Jump: