Hewlett-Packard HP-25C Scientific programmable calculator

General specifications
Type Scientific programmable calculator
Production years 1976 - 1978
New price USD 195.00
Operating system n.a.
Chipset/CPU -
I/O -
Performance index 1.6
Entry method Reverse Polish Notation
Precision 10 digits
Advanced functions

Forensic result 9.004076649

Scientific programmable calculator: Hewlett-Packard HP-25C
Programming model Fully-merged keystroke entry
Programming features

Program display Keycode
Program editing Overwrite capability
Programming 49
Data 8 numbers
Functions + -
Type LED
Size 10(8+2) digits
LWH 1276325 mm
Weight 170 g
Batteries 2NiCd AA
External power HP adapter
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Scientific programmable calculator: Hewlett-Packard HP-25C

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This page was last modified on September 10th, 2008

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3 Responses so far

Hello Hans,

I found a short description on www.thimet.de, please see http://www.thimet.de/CalcCollection/HP-Series/HP-Models.html for more details. Seems like 2 regular AA (small penlites) should work. Haven't tried it myself though, so be careful!
August 18th, 2009
Can you tell me, how to replace the batteries in batterypack of my good old HP-25C, pleas

Yours sincerely
Hans Jutzi
August 18th, 2009
This family of calculators is still my favourite. Exquisite design: No one has made a better battery door, or shaped a calculator to fit a cupped hand.

My 25c (RIP. Drowned in a bucket of water) was made in Singapore, and was identical except it didn't have the "Continuous Memory" script below the keyboard.

I couldn't find a 25c on eBay, so I ended up buying a 29c (!) for old times sake, and a new 35s for everyday use.

If you have a 25c in great condition, and you'd like a 29c in great condition, perhaps we can trade +$.
Peter Reynolds
April 17th, 2009