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diff --git a/reportbuilder/java/org/libreoffice/report/pentaho/styles/LengthCalculator.java b/reportbuilder/java/org/libreoffice/report/pentaho/styles/LengthCalculator.java
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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+package org.libreoffice.report.pentaho.styles;
+
+import org.jfree.layouting.input.style.values.CSSNumericType;
+import org.jfree.layouting.input.style.values.CSSNumericValue;
+
+/**
+ * A helper class that sums up various CSS-length. The various unit types are
+ * kept separate until the final result is computed to minimize the computation
+ * inaccuracy.
+ *
+ * @since 15.03.2007
+ */
+public class LengthCalculator
+{
+    // and centimeter (x10)
+
+    private double millimeter;
+    // and pica (x12) and inch(x72). Px is assumed to be in 96dpi.
+    private double point;
+    private double pixel;
+
+    public void add(final CSSNumericValue value)
+    {
+        if (value == null)
+        {
+            return;
+        }
+
+        final CSSNumericType numericType = value.getType();
+        if (numericType == CSSNumericType.CM)
+        {
+            millimeter += value.getValue() * 10;
+        }
+        else if (numericType == CSSNumericType.MM)
+        {
+            millimeter += value.getValue();
+        }
+        else if (numericType == CSSNumericType.PT)
+        {
+            point += value.getValue();
+        }
+        else if (numericType == CSSNumericType.PC)
+        {
+            point += 12 * value.getValue();
+        }
+        else if (numericType == CSSNumericType.INCH)
+        {
+            point += 72 * value.getValue();
+        }
+        else if (numericType == CSSNumericType.PX)
+        {
+            pixel += value.getValue();
+        }
+    }
+
+    public CSSNumericValue getResult()
+    {
+        if (pixel == 0 && point == 0)
+        {
+            return CSSNumericValue.createValue(CSSNumericType.MM, millimeter);
+        }
+        if (pixel == 0 && millimeter == 0)
+        {
+            return CSSNumericValue.createValue(CSSNumericType.PT, point);
+        }
+        if (point == 0 && millimeter == 0)
+        {
+            return CSSNumericValue.createValue(CSSNumericType.PX, pixel);
+        }
+        // else convert it.
+
+        double result = point;
+        result += (millimeter * 10 * 72 / 254);
+        result += pixel * 72 / 96;
+
+        return CSSNumericValue.createValue(CSSNumericType.PT, result);
+    }
+}