Resources Learn More Home /Cord Length Calculator Cord Length CalculatorCalculated O-ring Cord Cut Length ( ( OD + ID ) / 2 ) x Pi = length Pi=3.14159 Pi=3.14159 Input values in any two fields then press CalculateUse either millimeters or inches for input. Result should be interpreted in your input unit - mm or inch.Outside Diameter (OD)Inside Diameter (ID)Cross Section (CS)Cord Length (CL)Press to reset all fieldsPress to calculate and display results belowCalculated ResultsOD ResultID ResultCross Section ResultCord Length ResultID with OD and CLID with OD and CSID with CS and CLOD with ID and CLOD with CS and CLCS with ID and CLCS with OD and IDCS with OD and CLCL with OD and IDCL with OD and CSCL with ID and CSOD with ID and CSCross Section (CS) Learn about COR Manufacturing's Custom O-Rings.