The Weight of the Water in a Tank calculator computes the weight of water based on the diameter of the 
tank and the depth of the water column in the tank.
INSTRUCTIONS: Choose units and enter the following:
- (tD) Tank Diameter (inner)
- (wD) Water Depth (column of water in the tank)
Weight of Water (m): The calculator returns the weight of water in pounds and the volume of water in gallons. However these can be automatically converted to compatible units via the pull-down menu.
The Math / Science
This calculator uses the computed volume of the cylindrical tank (the water filled portion) and the mean density of water (approximately 1000 kg/cubic meter) to calculate the mass of the water. With the volume of the cylindrical tank, this formula then executes the simple equation below to compute the approximate mass of the object.
To query the mean density (mD or μD) of many common substances, elements, liquids and materials, CLICK HERE (e.g. the density of water is 1,000 kg/m³.
Plumbing Calculators
- Rolling Offsets (Run and Travel) – The Rolling Offset
Rolling Offset Lengths 
Pipe Grading function computes the run and travel length a rolling offset based on the offsets and fittings. (see diagram). - Diagonal of a Square - This is a simple calculation to assist in computing the diagonal of a square.
- Diagonal of a Box - This computes the length of the diagonal of a box (T) based on sides of length R, S and U.
- Flow Rate - This computes flow rate based on the total volume and the time it took to accumulate.
- Pipe Flow Volume - This computes the total volume from a pipe based on the flow rated and the duration of flow.
- Weight of Water in a Tank - Computes the weight of water in a cylindrical tank based on the radius and height (or length).
- Weight of Water in a Pipe - Computes the weight of water or other substances in a pipe based on the dimension and material density.
- Weight of Sea Water in pipe - Computes the weight of sea water in a cylinder based on the radius and height (or length)
- Pressure Head - The Potential Gravity-Fed Water Pressure from a Tank (a.k.a. Pressure Head) based on the height of storage.
- Pipe Volume - Computes the volume in a pipe
- Pipe Surface Area - Computes the surface area of a pipe.
- Pipe Coating Amount - Computes the volume of coating material for a pipe such as paint, polyethylene, polyurethane, zinc, bitumen, FBE or mortar.
- Pipe Grading - Compute the drop needed over a run to maintain a grade (e.g., 4" over 12')
- Volume of Water in a Tank (e.g. hot water tanks),
- Volume of a Spherical Container
- Weight of Water in a Spherical Container
- Volume of Water in Rectangular Tank
- Weight of Water in a Rectangular Tank
- Capillary Rise - The height of water in a small tube due to capillary force.
- Snow Water Equivalence - The volume of water created by an area and depth of snow.
- Pore Water Pressure - Pressure of uplift from the water table.
- Pipe Stress Budget - Computes the pressure that a pipe can withstand based on the allowable stress, wall thickness and outside diameter.