How can i rehab a torn calf muscle?

Depends on severity: If the muscle is severly torn and you can't lift your heel, you may need surgery and should see a physician. Regular exercise, starting with low impact activity such as cycling, may help a lot. A do, osteopathic physician, or a massage therapist or physical therapist may be helpful, as well.

Calf muscle: First make sure you have healed prior to rehab. Light stretching and muscle strengthening is indicated.

Torn Gastroc: Torn calf muscle happened because it could not absorb the load you placed on it and it failed. Therefore the goal of rehab is to make sure you are better than you were prior to the injury so you can return to that activity without injury. Just resting is not the answer, reconditioned. Need pain control, weight bearing protection, stretching, progressive strengthening to include eccentric loading.