How the Lubricating Oil Converter Works
The Lubricating Oil Converter divides lubricant mass by the density of the oil grade. The default 0.88 kg/L fits 15W-40 engine oil.
Pick the oil grade
Engine, gear, transmission and 2-stroke oils differ in density.
Enter the density
Use the table or the "density at 15°C" line on the product data sheet.
Enter the mass
Type the drum or sump oil weight in kilograms.
Read the liters
Use the volume for oil changes and stock records.
Lubricating Oil Converter Formula
The lubricating oil formula is V = m ÷ ρgrade. A 208 L (55 US gal) drum of 15W-40 holds about 183 kg.
- ρgrade
- Oil density at 15°C, kg/L
Worked Examples
- 15W-40 drum: 208 × 0.88 = 183.0 kg.
- 0W-20 jug: 4.5 kg ÷ 0.845 = 5.325 L.
- 80W-90 gear oil: 20 kg ÷ 0.90 = 22.22 L.
Lubricating Oil Converter Conversion Table
1 liter of 15W-40 engine oil weighs 0.880 kg. The table lists 9 lubricant grades with drum weights.
| Lubricant Grade | Density (kg/L) | Liters per 1 kg | 208 L drum (kg) | lb per US gal |
|---|---|---|---|---|
| SAE 0W-20 (synthetic) | 0.845 | 1.183 | 175.8 | 7.05 |
| SAE 5W-30 | 0.855 | 1.170 | 177.8 | 7.14 |
| SAE 10W-40 | 0.870 | 1.149 | 181.0 | 7.26 |
| SAE 15W-40 (diesel) | 0.880 | 1.136 | 183.0 | 7.34 |
| SAE 20W-50 | 0.885 | 1.130 | 184.1 | 7.39 |
| ATF (Dexron VI) | 0.860 | 1.163 | 178.9 | 7.18 |
| 2-stroke oil | 0.875 | 1.143 | 182.0 | 7.30 |
| Gear oil 75W-90 | 0.890 | 1.124 | 185.1 | 7.43 |
| Gear oil 80W-90 | 0.900 | 1.111 | 187.2 | 7.51 |
What is a Lubricating Oil Converter?
A Lubricating Oil Converter is a calculator that converts lubricant weight into volume using the density of the oil grade.
Lubricating oils combine base oils, API Groups I to V, with 10–30% additives such as detergents, dispersants, anti-wear zinc compounds and viscosity modifiers.
SAE viscosity grades describe flow, not density. A thicker 20W-50 oil weighs only about 5% more per liter than a thin 0W-20 oil.
What are the Uses of a Lubricating Oil Converter?
There are 4 main uses of a Lubricating Oil Converter.
Workshop stock
Garages convert drum weights into oil changes per drum.
Waste oil collection
Collectors convert tank liters into kg for waste notes.
Lubrication schedules
Plants convert grease and oil kg into liters per machine.
Import duties
Importers declare lubricants by net kilogram.