diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b373539..b40f03a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,7 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * [#162](https://github.com/python-qt-tools/PyQt5-stubs/pull/162) fixes all method not declared as signals
 * [#184](https://github.com/python-qt-tools/PyQt5-stubs/pull/184) Fix missing module variable
    detected by latest mypy 0.930
-
+* [#183](https://github.com/python-qt-tools/PyQt5-stubs/pull/183) Add missing operations on QSize
 ## 5.15.2.0
 
 ### Added
diff --git a/PyQt5-stubs/QtCore.pyi b/PyQt5-stubs/QtCore.pyi
index 8e74e0eb..1413e038 100644
--- a/PyQt5-stubs/QtCore.pyi
+++ b/PyQt5-stubs/QtCore.pyi
@@ -10767,14 +10767,17 @@ class QSize(sip.simplewrapper):
     @typing.overload
     def __init__(self, a0: 'QSize') -> None: ...
 
-    def __add__(self, value: 'QSize') -> 'QSize': ...
     def __eq__(self, value: object) -> bool: ...
+    def __ne__(self, value: object) -> bool: ...
+    def __add__(self, value: 'QSize') -> 'QSize': ...
     def __iadd__(self, value: 'QSize') -> 'QSize': ...
-    def __imul__(self, value: float) -> 'QSize': ...
+    def __sub__(self, value: 'QSize') -> 'QSize': ...
     def __isub__(self, value: 'QSize') -> 'QSize': ...
     def __mul__(self, value: float) -> 'QSize': ...
-    def __ne__(self, value: object) -> bool: ...
-    def __sub__(self, value: 'QSize') -> 'QSize': ...
+    def __rmul__(self, value: float) -> 'QSize': ...
+    def __imul__(self, value: float) -> 'QSize': ...
+    def __truediv__(self, value: float) -> 'QSize': ...
+    def __itruediv__(self, value: float) -> 'QSize': ...
 
     def shrunkBy(self, m: QMargins) -> 'QSize': ...
     def grownBy(self, m: QMargins) -> 'QSize': ...
@@ -10812,14 +10815,17 @@ class QSizeF(sip.simplewrapper):
     @typing.overload
     def __init__(self, a0: 'QSizeF') -> None: ...
 
-    def __add__(self, value: 'QSizeF') -> 'QSizeF': ...
     def __eq__(self, value: object) -> bool: ...
+    def __ne__(self, value: object) -> bool: ...
+    def __add__(self, value: 'QSizeF') -> 'QSizeF': ...
     def __iadd__(self, value: 'QSizeF') -> 'QSizeF': ...
-    def __imul__(self, value: float) -> 'QSizeF': ...
+    def __sub__(self, value: 'QSizeF') -> 'QSizeF': ...
     def __isub__(self, value: 'QSizeF') -> 'QSizeF': ...
     def __mul__(self, value: float) -> 'QSizeF': ...
-    def __ne__(self, value: object) -> bool: ...
-    def __sub__(self, value: 'QSizeF') -> 'QSizeF': ...
+    def __rmul__(self, value: float) -> 'QSizeF': ...
+    def __imul__(self, value: float) -> 'QSizeF': ...
+    def __truediv__(self, value: float) -> 'QSizeF': ...
+    def __itruediv__(self, value: float) -> 'QSizeF': ...
 
     def shrunkBy(self, m: QMarginsF) -> 'QSizeF': ...
     def grownBy(self, m: QMarginsF) -> 'QSizeF': ...
diff --git a/tests/qsize.py b/tests/qsize.py
new file mode 100644
index 00000000..4966cd97
--- /dev/null
+++ b/tests/qsize.py
@@ -0,0 +1,72 @@
+from PyQt5 import QtCore
+
+# QSize tests
+qs1 = QtCore.QSize(1,2)
+qs2 = QtCore.QSize(3,4)
+qs3 = QtCore.QSize(5,6)
+
+qs3 = qs1 + qs2
+assert type(qs3) == QtCore.QSize
+qs3 = qs1 - qs2
+assert type(qs3) == QtCore.QSize
+qs3 += qs1
+assert type(qs3) == QtCore.QSize
+qs3 -= qs2
+assert type(qs3) == QtCore.QSize
+
+qs3 = qs1 * 3
+assert type(qs3) == QtCore.QSize
+qs3 = qs1 * 3.0
+assert type(qs3) == QtCore.QSize
+
+qs3 = 3 * qs1
+assert type(qs3) == QtCore.QSize
+qs3 = 3.0 * qs1
+assert type(qs3) == QtCore.QSize
+
+qs3 = qs1 / 2.0
+assert type(qs3) == QtCore.QSize
+
+qs3 *= 3
+assert type(qs3) == QtCore.QSize
+qs3 *= 3.0
+assert type(qs3) == QtCore.QSize
+
+qs3 /= 3.0
+assert type(qs3) == QtCore.QSize
+
+
+# QSizeF tests
+qsf1 = QtCore.QSizeF(1.0,2.0)
+qsf2 = QtCore.QSizeF(3.0,4.0)
+qsf3 = QtCore.QSizeF(5.0,6.0)
+
+qsf3 = qsf1 + qsf2
+assert type(qsf3) == QtCore.QSizeF
+qsf3 = qsf1 - qsf2
+assert type(qsf3) == QtCore.QSizeF
+qsf3 += qsf1
+assert type(qsf3) == QtCore.QSizeF
+qsf3 -= qsf2
+assert type(qsf3) == QtCore.QSizeF
+
+qsf3 = qsf1 * 3
+assert type(qsf3) == QtCore.QSizeF
+qsf3 = qsf1 * 3.0
+assert type(qsf3) == QtCore.QSizeF
+
+qsf3 = 3 * qsf1
+assert type(qsf3) == QtCore.QSizeF
+qsf3 = 3.0 * qsf1
+assert type(qsf3) == QtCore.QSizeF
+
+qsf3 = qsf1 / 2.0
+assert type(qsf3) == QtCore.QSizeF
+
+qsf3 *= 3
+assert type(qsf3) == QtCore.QSizeF
+qsf3 *= 3.0
+assert type(qsf3) == QtCore.QSizeF
+
+qsf3 /= 3.0
+assert type(qsf3) == QtCore.QSizeF