HP · Voyager · July 1982 to January 1989
The HP-15C arrived on July 1, 1982 and packed the most math HP ever put in a Voyager: matrices up to 8 by 8, complex numbers on a second stack, a root finder and numerical integration, carried over from the HP-34C it replaced. HP hired William Kahan to design the numerical methods, and he wrote parts of the manual. Its 67 registers flex between data and up to 448 program lines. HP stopped making it in early 1989, and as the Collector's Edition handbook puts it, prices for used ones rose steadily and former users pressed HP to bring it back. HP did, twice, with the 2011 Limited Edition and the 2023 Collector's Edition. The original is the one with three button cells.
Good forEngineeringCollecting
Bench check
Should come with it
Check the listing photos against this list, and ask the seller about anything you can’t see. A missing piece should come off the price.
No hardware faults are documented for the 15C. The risk is buying a reissue or clone listed as an original, so check the batteries and labels.
New to old calculators? The condition checklist covers battery corrosion, displays, keys and card readers, and RPN in one hour gets you typing on an HP.
Buying guide
We'd buy the 15C titled tested and working with its case at $88 delivered, under the $95-200 delivered that most working originals ask among at least 45 for sale, nearly all in the US. HP reissued the 15C in 2011 and 2023, so ask for a photo inside the battery door, where three button cells mean an original and two CR2032 coin cells mean a reissue. Ask the seller to store a number, switch off and on, and recall it, which checks Continuous Memory. Skip the unit titled with LCD screen bleed unless it's priced as a repair, and the boxed set with its handbook at $744, about 5.5 times the median, which is collector money.
$74.92est. delivered
The lowest delivered 15C sold as working, titled tested at $75 delivered. The case isn't HP's and the photo shows worn keys, so ask for a video of every key typed once.
Vintage HP-15C Scientific Calculator HP 15C Tested Works Non-Original Case
$87.99delivered
Titled tested and working with a case, at $88 delivered from a 99.5% seller, under the band. The photo shows it switched on but not the case, so ask to see the case too.
HEWLETT PACKARD HP-15C PROGRAMMABLE SCIENTIFIC CALCULATOR W/ CASE TESTED & WORKS
$156.00est. delivered
Titled tested and working, with a case and batteries, at $156 delivered from a 99.3% seller. That's mid-band for a unit you can switch on the day it arrives; ask for the battery-door photo to confirm three button cells.
HP 15C Scientific Calculator + Case Hewlett Packard Tested Works With Batteries
Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$74.92est. delivered
$68.75 + $6.17 shipping
Buy It Now$68.75
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled tested and working, with a case that isn't HP's. Photo shows worn keys.
Seller: cbor3342
99.7% positive
Used$87.99delivered
$87.99 · free shipping
Buy It Now$87.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled tested and working, with a case. Photo shows it on, but not the case.
Seller: vintage-80
99.5% positive
Used$156.00est. delivered
$150.00 + $6.00 shipping
Buy It Now$150.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled tested and working, with a case and batteries.
Seller: erkpat
99.3% positive
Used$79.90delivered
$79.90 · free shipping
Buy It Now$79.90
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled with LCD screen bleed, a display fault. Comes with a case.
Seller: josha-7990
99.6% positive
Used$99.99delivered
$99.99 · free shipping
Buy It Now$99.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Titled tested. Photo shows it switched on beside its slip case.
Seller: dillan62_2008
99.7% positive
Used$137.04est. delivered
$129.95 + $7.09 shipping
Buy It Now$129.95
Our take
Titled tested and working, dated 1985, with the owner's handbook in the photo.
Seller: herekitschykitschy
100% positive
Used$199.00delivered
$199.00 · free shipping
Buy It Now$199.00
Check the seller
Photo shows every segment lit and the case, but seller feedback is 95.5%.
Seller: kobel-co
95.5% positive
Used$743.99delivered
$743.99 · free shipping
Buy It Now$743.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Priced high
Boxed with the handbook and papers in the photo. About 5.5 times the median.
Seller: austieiscute
99.8% positive
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