Calcoo – RPN and algebraic scientific calculator

For Calcoo Version 3, check out GitHub

screenshot

screenshot

RPN mode in Windows 11

algebraic mode in Debian Linux

download Calcoo (.jar 159Kb)

current version:	2.1.1 (Mar 08, 2026)
requires:	Java SE 25 or later
license:	GNU General Public License
help:	how to run calcoo.jar
more:	changelog, development page
feedback:	calcoo.calculator@gmail.com