ToriCalc is an advanced contact lens over-refraction calculator engineered for eye care professionals fitting soft contact lenses. Utilizing proven formulas along with a fast and easy to use interface on a mobile device, practitioners are able to increase lens fitting success rates and reduce fitting time. ToriCalc includes both spectacle to contact lens prescription conversion, and lens on eye crossed cylinder calculations. The practitioner can use ToriCalc to calculate the theoretical correct lens power based on sphero cylinder over refraction and subjective input. Combining both subjective and objective data points leads to greater accuracy and fitting options. Unlike other calculators, ToriCalc provides contact lens specialists with a tool providing resultant lens powers based on any combination of measured data or observed data.