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!
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.
References:
https://www.peterscars.com/what-is-coolant/
