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High-cis polybutadiene solutions were prepared in cyclohexane at 30 °C. Six different equations were used to calculate intrinsic viscosities and viscosimetric constant values from Huggins, Kraemer, Martin and Schulz-Blaschke equations by graphic extrapolation, and Solomon-Ciuta, Deb-Chantterjee and again Schulz-Blaschke equations, through a single point determination, which presents the advantage of being a faster method. The molecular mass of the polymers was determined applying Mark-Houwink-Sakurada equation. The values of intrinsic viscosity and viscosity-average molecular mass, obtained by both types of determination, were compared and the percentual differences between them were calculated in order to verify the validity of the single point determination for the system analyzed. The results suggest that the single point determination can be applied and Deb-Chantterjee equation …