diff --git a/Lib/colorsys.py b/Lib/colorsys.py
index e97f91718a3a30..677ba741ab790e 100644
--- a/Lib/colorsys.py
+++ b/Lib/colorsys.py
@@ -130,15 +130,12 @@ def rgb_to_hsv(r, g, b):
     if minc == maxc:
         return 0.0, 0.0, v
     s = rangec / maxc
-    rc = (maxc-r) / rangec
-    gc = (maxc-g) / rangec
-    bc = (maxc-b) / rangec
     if r == maxc:
-        h = bc-gc
+        h = (g-b) / rangec
     elif g == maxc:
-        h = 2.0+rc-bc
+        h = 2.0 + (b-r) / rangec
     else:
-        h = 4.0+gc-rc
+        h = 4.0 + (r-g) / rangec
     h = (h/6.0) % 1.0
     return h, s, v
 
diff --git a/Misc/NEWS.d/next/Library/2024-10-02-16-47-45.gh-issue-124879.9m2Wmx.rst b/Misc/NEWS.d/next/Library/2024-10-02-16-47-45.gh-issue-124879.9m2Wmx.rst
new file mode 100644
index 00000000000000..fa679ba0c6f198
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-10-02-16-47-45.gh-issue-124879.9m2Wmx.rst
@@ -0,0 +1 @@
+Optimized :func:`colorsys.rgb_to_hsv` to reduce the number of operations.