The formula to find the capacity of a barrel is V=R3 x X6, where V=capacity, and R= diagonal. Weight in kilos is different depending on the special weight of liquid. If it is must, the weight is bigger, while the wine is smaller.

To find how much litres is the capacity of your barrel you should take a batten, put it sideways from the opening hole until it leans in the opposite corner, under the barrels tap and measure the distance being careful the batten it is in the middle of hole. Repeat with the same way and on the other hand. If, as an example, a side shows you 68 cm and the other 72 cm, you add the two and you divide via 2 (68+72=140/2=70cm).

We prepared a table with values for the diagonal and the resulting capacity of the barrel

Diagonal lenght in centimetres Capacity in litres Diagonal lenght in centimetres Capacity in litres Diagonal lenght in centimetres Capacity in litres
50 46.5  60 128  70 205
 51  55  61  135  71  214
 52  66,5  62  143  72  223
 53  76  63  149  73  232
54  84 64  156 74  242
55  100 65  164 75  252
56  106 66  172 76  262
57  111 67  180 77  273
58  117 68 188 78  284
59  123 69  197 79  295