Fix incorrect Unit.Joule conversion factor in Energy class (#307)

gambon2010 · gambon0120 · web-flow · commit bd0dfececc2d · 2026-03-16T14:12:38.000+02:00
* fix joule conversion, added changelog message

---------

Co-authored-by: gambon0120 &lt;christophe@fritschy.net&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Fixed `Unit.Joule` conversion factor in `Energy` class returning incorrect foot-pounds to Joules values.
+
 ## [2.2.8] - 2026-01-26
 [:simple-github: GitHub release][2.2.8]
 
diff --git a/py_ballisticcalc/unit.py b/py_ballisticcalc/unit.py
@@ -1145,7 +1145,7 @@ class Energy(GenericDimension):
 
     _conversion_factors = {
         Unit.FootPound: 1.0,
-        Unit.Joule: 1.3558179483314,
+        Unit.Joule: 1 / 1.3558179483314,
     }
 
     # Energy.* unit aliases

Original file line number	Diff line number	Diff line change
`@@ -1145,7 +1145,7 @@ class Energy(GenericDimension):`
`1145`	`1145`
`1146`	`1146`	`_conversion_factors = {`
`1147`	`1147`	`Unit.FootPound: 1.0,`
`1148`		`- Unit.Joule: 1.3558179483314,`
	`1148`	`+ Unit.Joule: 1 / 1.3558179483314,`
`1149`	`1149`	`}`
`1150`	`1150`
`1151`	`1151`	`# Energy.* unit aliases`