Would help if you told us ACTUAL numbers instead of X inches !
74.42 gallons.
= 93.09 gallons (US) = 77.51 gallons (imperial)
Approximately 201 gallons.
Assuming it is a rectangle, 42.077 US gallons
A rough (high) estimate will use the volume of a rectangle. 155.42 US gallons
Volume = 29 x 21 x 9 = 5,481 cubic inches = 23.73 gallons (rounded)
If you mean inches, it can hold up to 6,739.95 gallons. If you mean feet, it can hold up to 11,646,630.24 gallons.
A tank of 21 inches wide, 8 inches deep and 59 inches long will hold 36 gallons of gas. These gallons refers to US gallons.
This cylinder can hold up to 171.7 Imperial gallons.
By my calculations (and they could be wrong--English major here), it would hold 11,320 gallons. Volume = πr2h = π(45.040848895006380022594105034422)2(40)
3.5 cubic inches holds 0.015 gallons.
72"X18"x8"=10368 cubic inches 10368 cu in x 0.00433 cubic inches/gal = 44.9 gallons Answer: 44.9 gallons