Well Volume Calculator

Created by Juhi Raj, PhD candidate
Reviewed by Hanna Pamuła, PhD candidate and Jack Bowater
Last updated: Jan 13, 2022

Are you wondering how to calculate your well volume? If so, this well volume calculator will answer all your questions about how to calculate the well water volume. The majority of the time, only a portion of the well is filled with water, rather than the complete volume. Still, figuring water volume in a well is significant for a couple of reasons, despite the fact that it may appear to be a superfluous and little-used calculation. For instance, this measurement is used to calculate the amount of material required to plug the well and the amount of disinfectant needed to clean it. This well volume calculator will also show you how to calculate its volume in the event of well water treatment or you can also use the well volume equation mentioned below to calculate it by yourself.

Our calculator assumes that the well is in the shape of a cylinder. You can use our tank volume calculator for other types of well.

Why do you need to figure the water volume of your well?

Knowing how much water you can collect from your well is an important part of owning one. Knowing how to calculate your well volume will enable you to compare the volume to overall water usage and ensure that you're correctly using your well and not placing undue strain on your water table. Similarly, if you need to repair or sink a new well, sampling the water will help.

How to calculate the volume of water in a well?

Our well volume calculator is very user-friendly and can help you quickly calculate the volume of water in your well.
You just need to measure the well dimensions mentioned below and plug it in our calculator:
Cylindrical Well

  1. You’ll need to find some basic information about your well before using our well volume calculator.

Begin with the diameter; most wells are dug in a circular pattern.
This might be as simple as getting out a tape measure, but try to be as precise as possible. This value will be referred to as Well diameter.

  1. Next, you’ll need to know the overall depth of your well. This value will be referred to as Total well depth.

You can measure this by putting a tiny weight to one end of a length of string and lowering it into the well until you feel it hit the bottom of the well. Then take the string and weight out of the well and measure how long it is.

  1. Similarly, you can determine the well's total depth above water by putting a tiny weight to one end of a length of string and lowering it into the well until you feel it hit the water. This value will be referred to as Static water depth. Then remove the thread and weight from the well and measure its length.

  2. Make sure you measure all the quantities in the same units. You can also use our length converter to help you have the same units for all three measurements.

  3. Plug in the three measured quantities in our well volume calculator and voila!!!

You don't have to worry about how to calculate the volume of water in a well anymore.

  1. The advanced mode in this calculator will help you compute the total well volume or, in other words, the total water your cylindrical well could contain.

Pumping out at least three times the volume of water in a well (known as the "water column") is a normal procedure when sampling a well. This is done to ensure that you acquire an accurate, representative sample of the groundwater and avoid any pollution that may have occurred as a result of the well being “stagnant” for an extended length of time. Hence, this calculator also shows you the results of the three volumes of your well.

Well volume equation

If you would like to calculate it by yourself, you can find the well volume equation below:

Well volume = π/4 * (Well diameter)² * (Total well depth - Static water depth)


π - The mathematical constant, approximately equal to 3.14159.

The total volume of water a cylindrical well can hold is calculated as shown below:

Total well volume = π/4 * (Well diameter)² * (Total well depth)

Calculating three times the well volume is as shown here:

Three well volumes = 3 * Well volume

Well water treatment

Most well water doesn’t need much filtration if the screen and pump are well maintained. However, there are several ways a well can become contaminated.
Toxic materials can easily leach into the aquifer and pollute the groundwater near your well, or contaminated water can get into wells that were installed poorly or not properly maintained.
You can use our water hardness calculator to calculate the hardness of the water you consume.

Fun Fact!

Do you wonder where well water comes from?

The tap water consumed at homes originates from a variety of sources.
Well water is derived from groundwater sources beneath the Earth's surface, which include porous water-bearing rocks and subterranean springs. Furthermore, the method of pumping the water from the well to the surface is a component of where the well water originates. Self-rising artesian wells and wells that employ pumping action to raise the water are the two types of wells that can be used to bring water up from the well.

Juhi Raj, PhD candidate
Well diameter
Total well depth
Static water depth
Well volume
US gal
Three well volumes
US gal
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