My math could be wrong so correct me if I'm wrong. A cord of wood is roughly around 700 pieces of firewood? So, roughly around 7,000 pieces of firewood a year you burn? 585 to 600 pieces of firewood a month?
I'm trying to figure out the math and how many pieces of firewood I would need from end of September to end of May if I only use firewood for heat in a wood stove. 4,800 maybe? Do you know what the average people use for the winter for heat?
I have never counted sticks only cords, sticks vary in size from itty bitty ones to large ones, a cord of wood is a set measurement 4X4X8 same goes for a face cord 16"X4X8 or 3face cords to a cord of wood.
Wood species vary in the number of Btu's per cord species such as pine,basswood,poplar, are lower in btu's maple, oak, osage, hickory are higher.
Heating oil produces X number of Btu's per gallon of oil.
There are online charts showing the btu's per cord of the individual species.
For your math
$2500 in oil gets you how many gallons of oil? number of gallons multiplied by btu's equals how many btu's you used to heat your home.
Figure how many btu's the species of wood you plan to burn produces per cord.
Take the number of btu's it took to heat with oil and divide the number of btu's in the cord of wood equals the appx number of cords required to heat your home, do not fail to account for the additional heat generated stacking, carrying inside, restacking, loading the stove/furnace and lastly carrying the ashes back outside.