Barrel Size
From end to end of Barrel Width of Barrel
Head
Diameter of
Engraveable Face
of Barrel Head
1 Liter 5″ 4.5″ 3.5″
2 Liter 7″ 5.5″ 4″
3 Liter 8.5″ 6″ 5″
5 Liter 9″ 7″ 5.5″
10 Liter 11.5″ 9″ 7″
20 Liter 15″ 11.5″ 9″

 all sizes are approximate since barrels are handmade and each will vary slightly.

Conversion Chart for Bootleg Barrels and Essences

Barrel Size Neutral Grain
Alcohol
Bottles of
Essence
1 Liter 1 Liter 1
2 Liter 2 Liters 2
3 Liter 3 Liters 3
5 Liter 5 Liters 5
10 Liter 10 Liters 10
20 Liter 20 Liters 20

Conversion Chart for Barrel Size to Different Volumes

Barrel Size 750 ml Bottles Volume
1 oz Shots
Volume
Gallons
1 Liter 1 1/3 33.8 0.264
2 Liter 2 2/3 67.6 0.528
3 Liter 4 101.4 0.793
5 Liter 6 2/3 169.1 1.321
10 Liter 13 1/3 338.1 2.642
20 Liter 26 2/3 676.3 5.283

This chart below shows the aging time comparison in different size barrels. It shows the ratio of square inches to liters of volume. The volume ratio is shown in a ratio to a standard 53 Gallon whiskey oak aging barrel. You can now determine the length of time you would need to age in your specific barrel size at home compared to the barrels at the distillery.

Volume
(Liters)
Surface Area
(Sq. Inches)
Surface to Volume
Ratio
Ratio to
53 Gallon Barrel
Days
= 1yr
Weeks
= 1yr
Months
= 1yr
1 Liter 206 206 6.31 58 8.24 1.90
2 Liter 297 148 4.54 80 11.45 2.64
3 Liter 398 133 4.07 90 12.79 2.95
5 Liter 569 114 3.49 105 14.92 3.44
10 Liter 892 89 2.73 134 19.04 4.39
20 Liter 1382 69 2.12 173 24.58 5.67
200 Liter
or 53 Gallon
6535 33 1.00 365 52.00 12.00