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Let us suppose your tank dimensions are  L = 8ft B = 6 ft D/H = 5 ft Then your volume of tank will be  8 x 6 x 5 = 240 ft³ Now 1ft³ = 28.31 liter, hence, total volume of tank in liter shall be 240 x 28.31 = 6794.4 liter.  That means almost 6800 liter of water can be stored in the tank.  Here is a quick video to show you  How to calculate water tank capacity in liters?

Quantities for unit volume (m 3 ) Work Proportion Cement (bags) Sand      (cu m) Agg.       (cu m) Bricks (no.) Rubble (cu m) Mason (no.) Labour (no.) Excavation 0.00 0.00 0.00 0.00 0.00 0.18 0.15 Concreting PCC   1:4:8 3.00 0.46 0.84 0.00 0.00 0.09 1.77   1:3:6 4.19 0.44 0.88 0.00 0.00 0.09 1.77   1:2:4 6.43 0.42 0.90 0.00 0.00 0.09 1.77 Concreting RCC   1:4:8 3.00 0.42 0.84 0.00 0.00 0.18 2.12   1:3:6 4.19 0.44 0.88 0.00 0.00 0.18 2.12   1:2:4 6.43 0.42 0.90 0.00 0.00 0.18 2.12 Brick Masonary