The density of hydraulic oil is about 0.8-0.9 g/ml, which is equal to 6.7-7.5 pounds per gallon. The exact density of a hydraulic oil depends on many factors like its type, chemical composition, and temperature.
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 hydraulic oil weight chart!
What is Hydraulic Oil?
Hydraulic oil is a special liquid used in systems in which the power has to be transferred through fluids. This non-compressible fluid is also known as hydraulic fluid, commonly used in hydraulic equipment and machinery.
Although the main role of hydraulic oil is transferring power, it can also act as a sealant and lubricant. What’s more, it transfers contaminants away and cools the systems.
Hydraulic oils are formulated for many different uses, so their exact composition varies widely.
These oils can be mineral and synthetic-based and often feature a variety of additives that provide the oils with different properties.
In this post, we will focus on the weight of oil-based hydraulic fluids.
What is the Standard Weight of Hydraulic Oil?
As reported by Valvoline.com, the density of mineral-based hydraulic oils falls into a range of 0.8-0.9 g/ml, which translates to 6.7-7.5 pounds per gallon. The exact density of a hydraulic oil depends on its type, chemical composition, and temperature.
Due to their lower density, hydraulic oils float on the surface of water.
The average weight of one US gallon of hydraulic oil in various measurement units is as follows:
- 1 US gallon of hydraulic oil = ca. 6.7-7.5 pounds
- 1 US gallon of hydraulic oil = ca. 107-120 ounces
- 1 US gallon of hydraulic oil = ca. 3.45-3.4 kg
- 1 US gallon of hydraulic oil = ca. 3039-3402 grams
Hydraulic Oil Weight Per Gallon Chart
For your convenience, we’ve compiled the most common conversion numbers into this hydraulic oil weight chart:
| Volume (US gal.) | Weight (lbs) |
| 1 gal. | 6.7-7.5 lbs |
| 2 gal. | 13.4-15.0 lbs |
| 3 gal. | 20.0-22.5 lbs |
| 4 gal. | 26.7-30.0 lbs |
| 5 gal. | 33.4-37.6 lbs |
| 6 gal. | 40.1-45.1 lbs |
| 7 gal. | 46.8-52.6 lbs |
| 8 gal. | 53.4-60.1 lbs |
| 9 gal. | 60.1-67.6 lbs |
| 10 gal. | 66.8-75.1 lbs |
| 20 gal. | 134-150 lbs |
| 30 gal. | 200-225 lbs |
| 40 gal. | 267-300 lbs |
| 50 gal. | 334-376 lbs |
| 55 gal. | 367-413 lbs |
| 60 gal. | 401-451 lbs |
| 70 gal. | 468-526 lbs |
| 80 gal. | 534-601 lbs |
| 90 gal. | 601-676 lbs |
| 100 gal. | 668-751 lbs |
| 200 gal. | 1336-1502 lbs |
| 250 gal. | 1670-1878 lbs |
| 300 gal. | 2004-2253 lbs |
| 330 gal. | 2204-2478 lbs |
| 400 gal. | 2672-3004 lbs |
| 500 gal. | 3340-3755 lbs |
This is just for informational purposes only! Density may vary depending on the type, the manufacturer, and the temperature.
Takeaways
What is hydraulic oil?
Hydraulic oil is a special liquid used in machines and systems in which the power has to be transferred through fluids. Although its main role is transferring power, hydraulic oil also acts as a lubricant, coolant, and sealant.
What is the density of hydraulic oil?
The density of hydraulic oils is about 0.8-0.9 g/ml or 800-900 kg/m3.
How much does hydraulic oil weigh per gallon?
As a rule of thumb, the average hydraulic oil weighs about 6.7-7.5 pounds per gallon.
References:
https://www.crownoil.co.uk/guides/hydraulic-oil-guide/
https://www.valvoline.com/en-eur/Hydraulic-Oil/
