While flexed mine is 13 inches and I work out more than the average 12 year old so probably 10-12 inches
The largest muscle of your calf is the gastrocnemius.
The gastrocnemius, the large muscle in the calf, flexes the knee and foot.
You will not find a pulse in your calf muscle.
I would spell this "calf" muscle - the plural is calves, but the singular is calf (in fact, calfs is coming into common usage in agriculture.) The large muscles at the top of the calf are the gastrocmenius, the muscles that extend the foot. The soleus are the flat, broader muscles that are underneath the gastrocnemius.
voluntary
The largest muscle in the frog is the gastrocnemius, which is like the calf muscle in the leg. It has to be large because of the way frogs locomote, i.e. the HOP.
well if your calf muscle constantly twitches you are probably having a muscle spasm
The heel raise exercise works your calf muscles, which are two separate muscles. The first is the gastrocnemius muscle, which is the outermost calf muscle on the back of your lower leg. Your soleus muscle is the second part of your calf muscle and rests underneath the gastrocnemius. However, the soleus is slightly wider than the gastrocnemius.
The gastrocnemius muscle is located with the soleus in the posterior (back) compartment of the leg. It is associated with the "bulge" in the calf muscle.
The calf muscles are the gastrocnemius and the soleus.
The term calf in calf muscle was derived from the Old Norse word, kaifi. It is closely related to the Irish Gaelic word calpa.
Calf muscle