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`m = [pi * r^2 * wD] * 1000 (kg)/(m^3)`

Enter a value for all fields

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.

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.

- Rolling Offsets (Run) – The Rolling Offset (Run) function computes the run length a rolling offset based on the offsets and fittings. (see diagram).
- Rolling Offsets (Travel) – The Rolling Offset (Travel) function computes the travel pipe 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**. - Counting the number of smaller diameter pipes are needed to match the flow of larger pipes.
- 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.
- Volume of a Pipe
- Weight of Pipe Contents: Default is water. Also see Weight of sea water in pipe
- Volume of a Cylindrical Container (e.g. hot water tanks),
- Weight of Water in a Cylindrical Tank (e.g. hot water tanks),
- Volume of a Spherical Container,
- Weight of Water in a Spherical Container
- Volume of a Rectangular container
- Weight of Water in a Rectangular Container, and a
- 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.
- Pressure Head - The Potential Gravity-Fed Water Pressure from a Tank (a.k.a. Pressure Head) equation calculates the water pressure that can be realized below a tank based on the height of storage.