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    <p>I've had endless trouble with decimals in XSLT/XPath 1.0, often a combination of it representing decimals as floating-point numbers and it using half-even rounding (banker's rounding). Unfortunately, the <code>round(yournum*100) div 100</code> approach didn't work for me, due to floating-point imprecision. For example, multiplying 1.255 by 100 gives 125.49999999999999 (this isn't meant to be implementation dependent, as it's supposed to be IEEE 754, but I don't know if all implementations do adhere to that). When rounded, this then gives 125, rather than the desired 126.</p> <p>I've taken the following approach, which I think works (although this is always a tricky area so I won't declare too much confidence!). However, it depends on your XSLT engine supporting EXSLT extensions. It presumes you want to round to two decimal places.</p> <pre><code>&lt;func:function name="local:RoundHalfUp"&gt; &lt;xsl:param name="number"/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="contains($number, '.')"&gt; &lt;xsl:variable name="decimal" select="estr:split($number, '.')[2]"/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="string-length($decimal) &amp;gt; 2"&gt; &lt;func:result select="format-number(concat($number, '1'), '0.00')"/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;func:result select="format-number($number, '0.00')"/&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;func:result select="format-number($number, '0.00')"/&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/func:function&gt; </code></pre> <p>which can be called like:</p> <pre><code>&lt;xsl:value-of select="local:RoundHalfUp(1.255)"/&gt; </code></pre> <p>The namespaces are:</p> <pre><code>xmlns:func="http://exslt.org/functions" xmlns:estr="http://exslt.org/strings" xmlns:local="http://www.acme.org/local_function" </code></pre> <p>It's important to note that the function <em>appends</em> a '1', not adds 0.001 or similar.</p> <p>Definately better to use XSLT 2.0 if it's an option (because it has a proper decimal type), but I know that's often not an option (from painful experience!).</p>
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