Calculate cost per US or Imperial gallon from price and liquid volume, solve for total cost or volume, and compare package prices across gallons, liters, quarts, and fluid ounces.
Cost Per Gallon Formula
The following equation is used to calculate the Cost Per Gallon.
Unit conversions: NIST Guide to the SI, volume conversions. Cost per gallon is total cost divided by the matching liquid volume; select US liquid or Imperial gallons consistently.
- Where CPG is the cost per gallon ($/gallon)
- C is the total cost ($)
- TV is the total volume of liquid (gallons)
To calculate the cost per gallon of any liquid, divide the total cost by the volume in gallons.
What is the Cost Per Gallon?
Definition:
A cost per gallon is a term, typically used to talk about water, oil, or other liquids, that describes the cost per unit volume in gallons.
What is the Cost Per Gallon of Water?
Water prices vary by utility, location, rate structure and included charges. Use the applicable local bill and matching volume; there is no single water price assumed by this calculator. See EPA guidance on understanding your water bill.
The cost per gallon of water is determined by several factors, including the water source, the treatment required, and the company providing it.
How to Calculate Cost Per Gallon?
Example Problem:
The following example outlines the steps and information needed to calculate a cost per gallon.
First, determine the total volume of the liquid. In this example, we are looking at a volume of 100 gallons of water.
Next, determine the total cost of the liquid. For these 100 gallons of water it costs us $50.00.
Finally, calculate the cost per gallon using the formula above:
CPG = C / TV
CPG = $50 / 100
CPG = $0.50 / gallon
