How big is a great tit bird?

The great tit (Parus major) is a medium-sized songbird, measuring approximately 12 to 14 centimeters (4.7 to 5.5 inches) in length. It typically weighs between 18 to 21 grams (0.63 to 0.74 ounces). With a wingspan of about 22 to 25 centimeters (8.7 to 9.8 inches), the great tit is easily recognizable by its vibrant yellow and black plumage.