Viscosity Calculator
The OilDoc Viscosity Calculator tells you the viscosity of your lubricant during operation
Use the new and free OilDoc Viscosity Calculatorto determine the kinematic viscosity of your lubricant for the operating temperature of your system! Additionally, calculate within a few seconds the Viscosity Index (VI) and generate within seconds a VT diagram (viscosity-temperature diagram). This way, you will determine the required viscosity of your oil for all temperatures, even in mixtures!
Viscosity Index (VI) Calculation
Calculation of Viscosity with Known VI
Calculating the mixed viscosity of two oils
Please wait a moment... the calculation may take a few seconds...
Your inputs:
Viscosity of the first mixed component: mm²/s
Viscosity of the second mixed component: mm²/s
Target viscosity: mm²/s
Percentage of the more viscous component
Percentage of the less viscous component
Calculation of Viscosity in Case of Accidental Mixing of Two Oils
Your inputs:
Viscosity of the first mixed component: mm²/s
Viscosity of the second mixed component: mm²/s
Total filling quantity of the system in liters:
Quantity of the refilled oil in liters:
Viscosity to be expected after mixing
Participation in the competition
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Utilize the OilDoc Viscosity Calculator…
to determine the kinematic viscosity of your lubricant for the specific operating temperature of your system!
In most cases, the product data sheet provided by the oil manufacturer typically offers the value at 40 °C, occasionally also providing the viscosity at 100 °C. However, since the temperature-dependent behavior of viscosity in mineral oils and related products does not follow a linear relationship, linear interpolation/regression is not feasible.
The DIN (German Institute for Standardization) has established a foundation where the viscosity index can be calculated through a formula, along with viscosity-dependent correction values. This index value describes the temperature behavior of the oil and can also be used to calculate the viscosity at a specific temperature, such as the regular operating temperature of the system or that in direct tribological contact. To calculate the VI, you can freely use an appropriate calculation tool available here.
After entering the kinematic viscosity at 40 °C and 100 °C, the corresponding VI (Viscosity Index) is calculated, and the corresponding VT diagram (Viscosity-Temperature diagram) is displayed, allowing you to read the viscosity of your oil at all temperatures .
Soon, we will provide you with additional calculation tools related to viscosity at this location. Just check back here again!
Disclaimer
We would like to point out that OilDoc GmbH assumes no warranty and/or liability for the accuracy or completeness of the displayed calculation results obtained through the provided online calculator. They serve only as a computational approximation; for detailed data, measurement series or low-temperature measurements are required.