# Reply To: % complete on Milestones

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Bob,

I’ve also used a milestones section and had this issue.  Here’s what I found:

The formula for % Complete is: (Actual Duration/Duration)*100.

For a summary with only milestones indented under it, the Duration for the summary is the span between the first and last milestone.

As the milestones are marked 100% Complete, they still have an Actual Duration of zero, so the summary Actual Duration and the summary % Complete stays at zero until the last milestone is completed.

When the last milestone is completed, the Actual Duration on the summary jumps to equal the Duration, and then the formula finally returns 100% Complete.

If you insert the Actual Duration column, you can test this out.

Hope this helps.

Regards,

Tim Jones