Answer:
The volume for a cylinder is computed as follows:
V = π*r²*h
where r is the radius and h the height
In the following table some values for r and h are assumed and the volume is computed (I cannot compare the results with the tool because I don't know which tool are you talking about)
radius (ft) height (ft) volume (ft³)
1 1 V = π*1²*1 = π ≈ 3.141
2 1 V = π*2²*1 = 4π ≈ 12.566
1 2 V = π*1²*2 =2π ≈ 6.283
2 2 V = π*2²*2 = 8π ≈ 25.132
3 1 V = π*3²*1 = 9π ≈ 28.274
1 3 V = π*1²*3 = 3π ≈ 9.424
3 3 V = π*3²*3 = 27π ≈ 84.823