L xW=sq.ft for your bed size.NOW take 3in. into 1ft.=.25 this is your depth of mulch.take your (bed size in sq.ft x .25=cubic feet L=100 x w=20=2000sq.ft x.25=500cubic.ft .to change to cubic yards divide by 27cubic ft =1cubic yd. =18.5cubic yd of mulch. i hope this helps.when your on the spot. my? is what is the going charge for a mulch job by cubic yd or ft.
For cedar mulch, I charge $80 per yard, bought and installed. If the client has it delivered, then I charge $50 per yard to install it.
It costs me almost $30 per yard whether I buy it bulk or in bags.
I'm charging right a $81 per cubic yard assuming it's going into a weed free bed. If the beds are weedy, the price per cubic yard increases. I charge frm $81 per cubic yard to $155 per cubic yard, depending on how the beds look.
Aren't you charging extra for de-weeding the beds?
If it's organic mulch, don't do it. The mulch will break down on top of the fabric, and not incorporate into the soil. Weed seeds will blow in and germinate on top of the mulch, the fabric will do NOTHING to stop this.
If it's inorganic "mulch", such as gravel/river rock, then, yes, put down fabric.