You can do the traditional standing calf raise machine or use a Smith machine. The goal here is to chase some progressive overload, so make sure you're tracking your sets, reps, and loading each week.
Also use an intensity technique called rest/pause. If you've never done rest/pause then get ready for some pain and gains.
After your warm-up sets, do an all-out set with a weight that causes you to fail at around 12-15 reps. Rest 20 seconds and go back at it for maximum reps. Rest 20 seconds and repeat that process one more time.
Between working 40-60 hours per week, carting the kids around, or being forced to take those swing dancing lessons you promised your girlfriend (we've all been there), the last thing on the "to do list" is going to the gym. Mr. G has the answer: the Two-Day Workout.