Enter your spring id (inside diameter), wire size (wire diameter) and length of the spring and it will calculate the following.

• Max Turns

• IPPT: Inch Pounds Per Turn. Force spring exerts per 1 turn of the spring

• Active coils

• Total coils

• Weight: Total door weight spring can hold

• Cycles

To calculate replacement of your current spring, use the replaceent tab and enter the specs of the spring with which you want to replace your current or mismatched springs.