counting length of pipe

What units are you working in? (Feet/inches or Metric)

Normally you can only take the overall length (add a factor for "cuts and drops") and divide the total by the Random (or double Random) length for your working units.

Single Random:

- Feet = 20

- Metric = 6.5

Double Random:

- Feet = 40

- Metric = 13

All of these are plus or minus (+/-) because the pipe mill cut-off machine is not accurate.

i have not problems with conversation of unit, but with procedures: there are more than 500 pipes with different dimensions and different layers. Do somebody know how to calculate (count) automatically with Autodesk map 5?