When you do strength training, your calf muscles (specifically the two parts of the gastrocnemius) get bigger, and they grow about as much as your chest muscles do.

When you do strength training, your calf muscle (specifically the inner part of the gastrocnemius) grows just as much as your thigh muscles (quadriceps) do.

When you do strength training, your calf muscle (gastrocnemius) grows just as much in size as your thigh muscle (quadriceps), both in absolute terms and compared to how big they were before.

If you're new to working out, both parts of your chest muscle might grow about the same when you lift weights.

Doing calf raises with your knees bent for 12 weeks doesn't seem to build much calf muscle, even if you train just as hard as you would for other muscles. This suggests that working your calves while they're shortened might not be the best way to make them grow.

Whether you're working your quads, calves, or biceps, stretching them fully during exercises helps them grow bigger — this works for many different muscles, not just one.