# Plumbing Math

## Roof Drain Calculations

In order to size rain water leaders and gutters there are some simple calculations to follow. First, you must know the maximum 15 minute rainfall …

## Rolling Offset Formula

Applying the Rolling Offset Formula: A rolling offset in a plumbing system is when a pipe changes in both the horizontal and vertical planes. The …

## Plumbing Math Formulas

Math unfortunately is part of being a plumber or any other skilled trade for that matter. Although we don’t tend to use many of these …

## Pipe Expansion Formula

Finding the expansion of pipe is relatively easy using the formula for “linear expansion”. There are many reasons beside trade school to know these calculations …

## Specific Gravity Formula

The specific gravity of a substance is a comparison between the mass or density of a substance as compared to an equal volume of water. …

## Ratio of Pipe Capacity Formula

An important plumbing concept is understanding the ratio between pipe size and volume output. A common question that can be found on plumbing exams is: …

## How To Convert Decimals To Fractions

Often when reading plans, surveys or calculating measurements we are left with decimal numbers and need to convert them to feet, inches and fractions of …

## Area Formulas for various objects

Area of a square / rectangle Area = length x width Area of a circle Area = diameter x diameter x .7854 Surface area of …

## Finding The Volume Of Objects

Finding the volume / capacities of various objects is generally quite simple, just follow these formulas. Rectangular tanks Cylindrical tanks Elliptical tanks Spheres Frustum shaped …