diff --git a/src/barchart/barchartitem.cpp b/src/barchart/barchartitem.cpp
index f12cf02..13e85d5 100644
--- a/src/barchart/barchartitem.cpp
+++ b/src/barchart/barchartitem.cpp
@@ -111,8 +111,7 @@ QVector<QRectF> BarChartItem::calculateLayout()
     qreal rangeX = m_domainMaxX - m_domainMinX;
     qreal scaleY = (height / rangeY);
     qreal scaleX = (width / rangeX);
-    qreal categoryWidth = width / categoryCount;
-    qreal barWidth = categoryWidth - categoryWidth * m_series->d_func()->barMargin();
+    qreal barWidth = scaleX - scaleX * m_series->d_func()->barMargin();
 
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {
diff --git a/src/barchart/groupedbarchartitem.cpp b/src/barchart/groupedbarchartitem.cpp
index 1c438e9..e636502 100644
--- a/src/barchart/groupedbarchartitem.cpp
+++ b/src/barchart/groupedbarchartitem.cpp
@@ -47,8 +47,7 @@ QVector<QRectF> GroupedBarChartItem::calculateLayout()
     qreal rangeX = m_domainMaxX - m_domainMinX;
     qreal scaleY = (height / rangeY);
     qreal scaleX = (width / rangeX);
-    qreal categoryWidth = width / categoryCount;
-    qreal barWidth = categoryWidth / setCount - (categoryWidth / setCount) * m_series->d_func()->barMargin();
+    qreal barWidth = scaleX / setCount - (scaleX / setCount) * m_series->d_func()->barMargin();
 
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {
diff --git a/src/barchart/percentbarchartitem.cpp b/src/barchart/percentbarchartitem.cpp
index a416c46..72fc7be 100644
--- a/src/barchart/percentbarchartitem.cpp
+++ b/src/barchart/percentbarchartitem.cpp
@@ -47,8 +47,7 @@ QVector<QRectF> PercentBarChartItem::calculateLayout()
     qreal rangeX = m_domainMaxX - m_domainMinX;
     qreal scaleY = (height / rangeY);
     qreal scaleX = (width / rangeX);
-    qreal categoryWidth = width / categoryCount;
-    qreal barWidth = categoryWidth - categoryWidth * m_series->d_func()->barMargin();
+    qreal barWidth = scaleX - scaleX * m_series->d_func()->barMargin();
 
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {
diff --git a/src/barchart/stackedbarchartitem.cpp b/src/barchart/stackedbarchartitem.cpp
index efd5222..0fa5023 100644
--- a/src/barchart/stackedbarchartitem.cpp
+++ b/src/barchart/stackedbarchartitem.cpp
@@ -46,8 +46,7 @@ QVector<QRectF> StackedBarChartItem::calculateLayout()
     qreal rangeX = m_domainMaxX - m_domainMinX;
     qreal scaleY = (height / rangeY);
     qreal scaleX = (width / rangeX);
-    qreal categoryWidth = width / categoryCount;
-    qreal barWidth = categoryWidth - categoryWidth * m_series->d_func()->barMargin();
+    qreal barWidth = scaleX - scaleX * m_series->d_func()->barMargin();
 
     int itemIndex(0);
     for (int category = 0; category < categoryCount; category++) {