diff --git a/changelogs/fragments/229_lvol_percentage_fix.yml b/changelogs/fragments/229_lvol_percentage_fix.yml
new file mode 100644
index 00000000000..aaf98454ed4
--- /dev/null
+++ b/changelogs/fragments/229_lvol_percentage_fix.yml
@@ -0,0 +1,2 @@
+minor_changes:
+ - lvol - fix idempotency issue when using lvol with ``%VG`` or ``%PVS`` size options and VG is fully allocated (https://github.com/ansible-collections/community.general/pull/229).
diff --git a/plugins/modules/system/lvol.py b/plugins/modules/system/lvol.py
index 26ea7dc24ef..2e9ad9189ac 100644
--- a/plugins/modules/system/lvol.py
+++ b/plugins/modules/system/lvol.py
@@ -468,6 +468,10 @@ def main():
                 size_requested = size_percent * this_vg['size'] / 100
             else:  # size_whole == 'FREE':
                 size_requested = size_percent * this_vg['free'] / 100
+
+            # Round down to the next lowest whole physical extent
+            size_requested -= (size_requested % this_vg['ext_size'])
+
             if '+' in size:
                 size_requested += this_lv['size']
             if this_lv['size'] < size_requested: