**The average weight of automotive coolants is about 8.7-9 pounds per US gallons since the density of these liquids falls into the range of 1.04-1.08 g/ml. This is no surprise since most coolants are a 50:50 mixture of water (1 g/ml) and ethylene glycol-based antifreeze (1.12 g/ml).**

But if you don’t feel like calculating and would rather just get the values from a chart, you’ve come to the right place.

We at PowerSportsGuide have compiled the most common conversion numbers into one coolant weight chart!

**Contents**show

## What is Coolant?

**Contrary to popular belief, coolant is not the same as antifreeze. Instead, coolant is a (typically 50:50) mixture of distilled water and antifreeze, which can be made of either propylene glycol or, more commonly, ethylene glycol.**

Coolant is often sold as a prepaid mixture consisting of 50% distilled water and 50% antifreeze, or a concentrate that must be mixed with distilled water before use.

However, coolants formulated for extremely cold temperatures may contain 60% or 70% antifreeze.

## What is the Standard Weight for Coolant?

**Based on our research, the density of most automotive coolants falls into a range of 1.04-1.08 g/ml, which translates into a weight of 8.7-9.0 pounds per US gallon.**

Similar values are obtained by calculating the density of the mixture of water and ethylene glycol antifreeze.

As we’ve discussed, most automotive coolants are a 50:50 mixture of ethylene glycol-based antifreeze and distilled water:

- The density of ethylene glycol: 1.12 g/ml at 68
**°**F - The density of distilled water: 1 g/ml at 68
**°**F

Calculation:

- (1.12/(100/50)) + (1/(100/50)) =
**1.06 g/ml**

Let’s do the same calculation for a 70:30 mixture:

- (1.12/(100/70)) + (1/(100/30)) =
**1.08 g/ml**

**Based on the above, the average weight of one gallon of coolant at** **68°F in various measurement units is as follows:**

- 1 US gallon of coolant = ca. 8.7-9 pounds
- 1 US gallon of coolant = ca. 139.2-144 ounces
- 1 US gallon of coolant = ca. 3.95-4.1 kg
- 1 US gallon of coolant = ca. 3946-4082 grams

Note that these are just some hard numbers, as the exact weight of a coolant liquid depends on many factors like the chemical composition of the antifreeze, mixing ratio, and the temperature.

## Coolant Weight-per-Gallon Chart

For your convenience, we’ve compiled some of the most common conversion numbers into this coolant weight-per-gallon chart:

Volume (US gallons) | Weight (pounds) |

1 gal. | 8.7-9 lbs |

2 gal. | 17.4-18 lbs |

3 gal. | 26.1-27 lbs |

4 gal. | 34.8-36 lbs |

5 gal. | 43.5-45 lbs |

6 gal. | 52.2-54 lbs |

7 gal. | 60.9-63 lbs |

8 gal. | 69.6-72 lbs |

9 gal. | 78.3-81 lbs |

10 gal. | 87-90 lbs |

20 gal. | 174-180 lbs |

30 gal. | 261-270 lbs |

40 gal. | 348-360 lbs |

50 gal. | 435-450 lbs |

55 gal. | 479-495 lbs |

60 gal. | 522-540 lbs |

70 gal. | 609-630 lbs |

80 gal. | 696-720 lbs |

90 gal. | 783-810 lbs |

100 gal. | 870-900 lbs |

200 gal. | 1740-1800 lbs |

250 gal. | 2175-2250 lbs |

300 gal. | 2610-2700 lbs |

330 gal. | 2871-2970 lbs |

400 gal. | 3480-3600 lbs |

500 gal. | 4350-4500 lbs |

*This is just for informational purposes only! Density may vary depending on the type, the manufacturer, and the temperature.*

## FAQs About the Weight of Coolant

**What is coolant made of?**

Coolant is typically a 50:50 mixture of water and antifreeze. However, certain coolants are formulated for extremely cold temperatures; these liquids often consist of 70% antifreeze and 30% water. The antifreeze used in coolants can be made of ethylene glycol or propylene glycol.

**What’s the density of coolant?**

The average density of coolant is about 1.04-1.08 g/ml, or 1040-1050 kg/m3.

**How much does coolant weigh per gallon?**

The weight of coolant is about 8.7-9 pounds per gallon.

**Is coolant heavier than water?**

Yes, coolant is heaver than water due to its higher density (1.04-1.08 > 1 g/ml).

**Does coolant sink or float in water?**

Due to its higher density, coolant sinks in water.

**How much does 1 gallon of coolant weigh?**

One gallon of coolant weighs about 8.7-9 pounds.

**How much do 2 gallons of coolant weigh?**

2 gallons of coolant weigh about 17.4-18 pounds.

**How much do 3 gallons of coolant weigh?**

3 gallons of coolant weigh about 26.1-27 pounds.

**How much do 4 gallons of coolant weigh?**

4 gallons of coolant weigh about 34.8-36 pounds.

**How much do 5 gallons of coolant weigh?**

5 gallons of coolant weigh about 43.5-45 pounds.

**How much do 6 gallons of coolant weigh?**

6 gallons of coolant weigh about 52.2-54 pounds.

**How much do 7 gallons of coolant weigh?**

7 gallons of coolant weigh about 60.9-63 pounds.

**How much do 8 gallons of coolant weigh?**

8 gallons of coolant weigh about 69.6-72 pounds.

**How much do 9 gallons of coolant weigh?**

9 gallons of coolant weigh about 78.3-81 pounds.

**How much do 10 gallons of coolant weigh?**

10 gallons of coolant weigh about 87-90 pounds.

**How much do 20 gallons of coolant weigh?**

20 gallons of coolant weigh about 174-180 pounds.

**How much do 30 gallons of coolant weigh?**

30 gallons of coolant weigh about 261-270 pounds.

**How much do 40 gallons of coolant weigh?**

40 gallons of coolant weigh about 348-360 pounds.

**How much do 42 gallons of coolant weigh?**

42 gallons of coolant weigh about 365-378 pounds.

**How much do 50 gallons of coolant weigh?**

50 gallons of coolant weigh about 435-450 pounds.

**How much do 55 gallons of coolant weigh?**

55 gallons of coolant weigh about 479-495 pounds.

**How much do 60 gallons of coolant weigh?**

60 gallons of coolant weigh about 522-540 pounds.

**How much do 70 gallons of coolant weigh?**

70 gallons of coolant weigh about 609-630 pounds.

**How much do 80 gallons of coolant weigh?**

80 gallons of coolant weigh about 696-720 pounds.

**How much do 90 gallons of coolant weigh?**

90 gallons of coolant weigh about 783-810 pounds.

**How much do 100 gallons of coolant weigh?**

100 gallons of coolant weigh about 870-900 pounds.

**How much do 120 gallons of coolant weigh?**

120 gallons of coolant weigh about 1044-1080 pounds.

**How much do 150 gallons of coolant weigh?**

150 gallons of coolant weigh about 1305-1350 pounds.

**How much do 200 gallons of coolant weigh?**

200 gallons of coolant weigh about 1740-1800 pounds.

**How much do 250 gallons of coolant weigh?**

250 gallons of coolant weigh about 2175-2250 pounds.

**How much do 300 gallons of coolant weigh?**

300 gallons of coolant weigh about 2610-2700 pounds.

**How much do 330 gallons of coolant weigh?**

330 gallons of coolant weigh about 2871-2970 pounds.

**How much do 400 gallons of coolant weigh?**

400 gallons of coolant weigh about 3480-3600 pounds.

**How much do 500 gallons of coolant weigh?**

500 gallons of coolant weigh about 4350-4500 pounds.

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