Viscosity prediction of ionic liquids using NLR and SVM approaches

•A comprehensive database containing 15,251 data points for 1654 different ILs was compiled.•Two group contribution models, NLR-model and SVM-model, were developed.•A new group contribution scheme with two types of groups was proposed.•The performance of the SVM-model is better than both the NLR-model and those in the literature.•The proposed models were implemented as a simple MS Excel-based computer tool.