Well.. Are you asking how much coverage you can expect per unit?

If it were me I would use the lower figure. In the event there's leftover you can always find a place for it, but if you're short.. You know that phrase about you can't cut a board longer? Mulch is kinda like that.

To know just what they mean by what one bag will cover you need to know the depth they applied it. If your mulch is meant to help control "weeds" it needs to be a minimum of 3 inches and preferably 4 to 6 inches thick, unless you have some newspaper or cardboard to supplement that. At 2 inches you definately will need some other barrier under the mulch for it to be effective.

http://www.bandbbedding.com/mulchcalculator.html

Thanks for your help. Any way I look at it I need one heck of alot of mulch. I have 2600 square feet of beds to mulch.

Teresa

Yep.. And whatever you calculate, add another 3rd.