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The **General Pluming Calculator** formulas include the following: * Rolling Offset Lengths *

- 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 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**.

The **Flow Equations** equations include:

- 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.

The **Volume and Weight **equations include the volume and content weight of:

- 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
- mean density lookup function that provides the mean density of hundreds of substances.

The **Other** equations include:

- 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.

The mean density (mD) can help the user calculate the content weight of containers (pipes and tanks) that hold substances other than water (e.g. diesel fuel or sludge). The calculations require the user to enter the dimensions of the object (e.g. pipe, tank) to compute the volume. For the weight equations, use the dimensions and the mean density of the substance in the object. **Note:** The mean density of water is 1,000 kg / m^{3}. Use this in the mass/weight equations to approximate the weight of water in the tank or pipe.

- Common Mean Densities - This equation returns the mean density of hundreds of substances. If something beside water (~1,000 kg/m
^{2)}is in the pipes or tanks, the mean density for that substance may be in this list. - House Builder - This is a foundation, framing and roofing calculator.