Wood rounds in a cord

[jolj]

If they are 18” diameter also, 48 would do it.
That’s 2.65 cubic feet each, times 48 rounds equals 127.2 cubic feet.

Take radius of round in inches ( half the distance across ) and multiply it by itself, then multiply by pi (3.14). That gives square inches, take that and multiply by the round length in inches, now you have cubic inches of round.

To change cubic inches to cubic feet, take above answer and divide by 1728 (cubic inches per foot).

After that divide 128 cubic feet (amount of cubic feet per cord) by above answer and you have the number of rounds needed.

9x9 = 81
81x3.14=254.34
254.34x18=4578.12
4578.12/1728=2.65 cubic foot
128/2.65=48.3 number of rounds needed

That looks easy on paper.

 

[Townie]

Now, how long is a rope?

 

[jolj]

Now, how long is a rope?

Longer than one inch/30mm & shorter than 3.14
I am guessing.

 

[Dcsco]

If they are 18” diameter also, 48 would do it.
That’s 2.65 cubic feet each, times 48 rounds equals 127.2 cubic feet.

Take radius of round in inches ( half the distance across ) and multiply it by itself, then multiply by pi (3.14). That gives square inches, take that and multiply by the round length in inches, now you have cubic inches of round.

To change cubic inches to cubic feet, take above answer and divide by 1728 (cubic inches per foot).

After that divide 128 cubic feet (amount of cubic feet per cord) by above answer and you have the number of rounds needed.

9x9 = 81
81x3.14=254.34
254.34x18=4578.12
4578.12/1728=2.65 cubic foot
128/2.65=48.3 number of rounds needed

There is an easier way, at least for me. A circle is about 78% of a square. I use 75%. If average round is 18” and you have 30’. Treat it as a square, find area, and multiple by 75%. I can usually do that in my head.

18” is 1.5 feet. 1.5 x 1.5 = 2.25 x 30= 67.5 cu ft
75% of 67.5= About 50 cu ft

A circle is .7853 the area inside a square.