Sialolithiasis means the formation of calcified structure in salivary gland and at the salivary duct ranging from tiny particle to several centimeters in size. Sialolithiasis often occur at any age, but it is most common in middle-aged adults in the submandibular gland with 80-90 % occurrence, followed by parotid, accounting for 5-15 % and about 2-5 % in sublingual gland. Majority of salivary stones are asymptomatic or cause minimal discomfort, large stones may interfere with the flow of saliva and cause pain and swelling. In this case report, a 40-year-old male with a large calculus in the submandibular gland duct is presented. The calculus was roughly oval and it was remarkable for its size.