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    <p>Unless your functions are very slow, you're going to need a very high-resolution timer. The most accurate one I know is <code>QueryPerformanceCounter</code>. Google it for more info. Try pushing the following into a class, call it <code>CTimer</code> say, then you can make an instance somewhere global and just call <code>.StartCounter</code> and <code>.TimeElapsed</code></p> <pre><code>Option Explicit Private Type LARGE_INTEGER lowpart As Long highpart As Long End Type Private Declare Function QueryPerformanceCounter Lib "kernel32" (lpPerformanceCount As LARGE_INTEGER) As Long Private Declare Function QueryPerformanceFrequency Lib "kernel32" (lpFrequency As LARGE_INTEGER) As Long Private m_CounterStart As LARGE_INTEGER Private m_CounterEnd As LARGE_INTEGER Private m_crFrequency As Double Private Const TWO_32 = 4294967296# ' = 256# * 256# * 256# * 256# Private Function LI2Double(LI As LARGE_INTEGER) As Double Dim Low As Double Low = LI.lowpart If Low &lt; 0 Then Low = Low + TWO_32 End If LI2Double = LI.highpart * TWO_32 + Low End Function Private Sub Class_Initialize() Dim PerfFrequency As LARGE_INTEGER QueryPerformanceFrequency PerfFrequency m_crFrequency = LI2Double(PerfFrequency) End Sub Public Sub StartCounter() QueryPerformanceCounter m_CounterStart End Sub Property Get TimeElapsed() As Double Dim crStart As Double Dim crStop As Double QueryPerformanceCounter m_CounterEnd crStart = LI2Double(m_CounterStart) crStop = LI2Double(m_CounterEnd) TimeElapsed = 1000# * (crStop - crStart) / m_crFrequency End Property </code></pre>
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    1. POHow do you test running time of VBA code?
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    1. USMike Woodhouse
    1. USMike Woodhouse
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    1. POHow do you test running time of VBA code?
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    1. COI implemented this in Excel VBA (adding in the Overhead as mentioned in this KB article: http://support.microsoft.com/kb/172338. It worked great. Thanks.
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      1. USLance Roberts
    2. COThanks, this works well for me, too. `TimeElapsed()` gives the result in milliseconds. I did not implement any overhead compensation because I was more worried about the effect of a stutter in the overhead calculation than perfect accuracy.
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      1. USJustin
 

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