Stock Tank Volume Calculator
A stock tank holds water for livestock, and its volume tells you how long a fill lasts. Pick the shape, enter the size and the water depth, and this gives the capacity.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The volume of a round tank is the area of its circle times the water depth. The area is pi times the radius squared, where the radius is half the diameter.
A rectangular tank holds length times width times the depth of water. Enter the depth of the water, not the height of the tank, if the tank is not full.
Worked example
A round tank filled to 2 ft holds 188 gal of water at the size you entered.
Questions
How do I measure a round tank?
Measure across the middle from one side to the other. If you only have the distance around, divide it by pi to get the diameter.
Does the tank hold its full volume?
Not usually. Water sits below the rim, so enter the depth of the water to get the amount you have.
How long will the water last?
This shows capacity, not use. Divide the gallons by what your animals drink in a day to estimate how many days a full tank lasts.
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