diff --git a/src/core/layout/qgspagesizeregistry.cpp b/src/core/layout/qgspagesizeregistry.cpp
index d4fd76bf7d2..745a62e1e69 100644
--- a/src/core/layout/qgspagesizeregistry.cpp
+++ b/src/core/layout/qgspagesizeregistry.cpp
@@ -97,8 +97,8 @@ QString QgsPageSizeRegistry::find( const QgsLayoutSize &size ) const
     QgsLayoutSize xSize = converter.convert( size, pageSize.size.units() );
 
     //consider width and height values may be exchanged
-    if ( ( qgsDoubleNear( xSize.width(), pageSize.size.width() ) && qgsDoubleNear( xSize.height(), pageSize.size.height() ) )
-         || ( qgsDoubleNear( xSize.height(), pageSize.size.width() ) && qgsDoubleNear( xSize.width(), pageSize.size.height() ) ) )
+    if ( ( qgsDoubleNear( xSize.width(), pageSize.size.width(), 0.01 ) && qgsDoubleNear( xSize.height(), pageSize.size.height(), 0.01 ) )
+         || ( qgsDoubleNear( xSize.height(), pageSize.size.width(), 0.01 ) && qgsDoubleNear( xSize.width(), pageSize.size.height(), 0.01 ) ) )
     {
       return pageSize.name;
     }
diff --git a/tests/src/core/testqgspagesizeregistry.cpp b/tests/src/core/testqgspagesizeregistry.cpp
index 2d127f65d45..046d57d5f17 100644
--- a/tests/src/core/testqgspagesizeregistry.cpp
+++ b/tests/src/core/testqgspagesizeregistry.cpp
@@ -131,7 +131,8 @@ void TestQgsPageSizeRegistry::findBySize()
   QCOMPARE( registry->find( QgsLayoutSize( 297, 210 ) ), QStringLiteral( "A4" ) );
   QCOMPARE( registry->find( QgsLayoutSize( 125, 176 ) ), QStringLiteral( "B6" ) );
   QCOMPARE( registry->find( QgsLayoutSize( 21, 29.7, QgsUnitTypes::LayoutCentimeters ) ), QStringLiteral( "A4" ) );
-
+  // must have allowance of 0.01 units - because we round to this precision in all page size widgets
+  QCOMPARE( registry->find( QgsLayoutSize( 125.009, 175.991 ) ), QStringLiteral( "B6" ) );
 }
 
 void TestQgsPageSizeRegistry::decodePageSize()