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Soil cone index (CI) is a mechanical property which affects soil compaction and plant root development. In this study, data reported in the literature relating CI to tillage practices were compiled. Two different tillage practices were included and they were no-tillage and conventional tillage. Based on the literature data, linear regression equations were proposed to estimate CI for each tillage system. Those equations incorporate basic soil variables such as texture and physical properties. Values of CI decrease with the increase in clay content, and increase with the increase in sand and silt contents. CI varies directly with bulk density and depth, and inversely with moisture content. The regression equations will be validated with field data from Manitoba.