Viscosity decreases as temperature increases because the molecules vibrate more, and interact less. The viscosity index and peak pressure strongly correlated with the weight of the injection molded parts toward the materials of different viscosity. The viscosity of coconut oil is dependent upon temperature. The viscosity-temperature coefficient for coconut oil can vary by a factor of 10 depending on the temperature. The viscosity index obtained by the graphical method is much higher than that obtained by the other methods. Viscosity index obtained with the calculator program is 99,39% lower than that obtained by equation (1). The measurements were carried out at 40± 0.1 and 100± 0.1☌, according to the recommendation of ASTM D2270. Viscosity index of a coconut oil was determined using a set of Schott Ubbelohde-type viscometers selected according to the values of their constants, so that the margins of the uncertainty, inherent in the Hagebach-Couette correction, does not exceed the error allowed for the measurements. The viscosity-temperature coefficient was calculated from the measured viscosity at 40☌ and 100☌. Viscosity index calculation was performed with a computer program using kinematics viscosity at 40☌ and 100☌. Viscosity index was calculated from the measured viscosity at 40☌ and 100☌ using ASTM Method D 2270 and was graphically determined using ASTM D 341. The Viscosity Index Calculator simplifies the determination of the viscosity index, aiding engineers and researchers in selecting the most suitable fluids for various applications, such as automotive engines, industrial machinery, and hydraulic systems, where maintaining consistent lubrication properties is critical.In this paper viscosity index of coconut oil was determined using three methods. A higher VI indicates that the fluid’s viscosity changes less with temperature variations, which is often desirable for maintaining lubrication efficiency in a wide range of operating conditions. The viscosity index is a crucial parameter for evaluating the performance of lubricants and hydraulic fluids. H is the kinematic viscosity of the fluid at a higher reference temperature (typically 100☌).L is the kinematic viscosity of the fluid at a lower reference temperature (typically 40☌).VI represents the viscosity index, a dimensionless number used to quantify how the viscosity of a fluid changes with temperature.The formula for calculating the viscosity index (VI) is as follows: The Viscosity Index Calculator is a valuable tool used in fluid dynamics and engineering to assess the viscosity-temperature relationship of lubricating oils and fluids. About Viscosity Index Calculator (Formula)
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