Enter the size of your cooler and the time needed to keep items cold into the calculator to determine the amount of dry ice needed.

Dry Ice Formula

The following formula is used to calculate the amount of dry ice needed to keep items cold in a cooler.

Di = T * 15 * CS / 75

  • Where Di is the amount of dry ice (lbs)
  • T is the amount of time needed to keep items cool (days)
  • CS is the cooler size (quarts)

This is only an estimation and the true amount of ice will vary depending on the insulation of the cooler and the temperature outside.

What is dry ice?


Dry ice is the solid form of carbon dioxide that is achieved when the CO2 is cooled to very low temperatures.

The CO2 must reach temperatures of -110 F in order to become solid.

How to calculate how much dry ice i need?

Example Problem:

The following example outlines how to determine how much dry ice you need for a cooler.

First, determine the size of the cooler. In this example, the cooler holds 40 quarts.

Next, determine the number of days needed to keep the items in the cooler cold. In this case, we want to keep the items cold for 2 days.

Finally, calculate the lbs of dry ice needed using the formula above:

Di = T * 15 * CS / 75

Di = 2* 15 * 40 / 75

Di = 16 lbs