How many centimeters is the 30-inch photo frame in the photography building?

6 1×76.2 cm, the default size of photo frame industry is inches, and 1 inch is about 2.54cm..

The size of a photo frame refers to the inner diameter of the photo frame, that is, how big a photo can be put as a size, regardless of the outer diameter of the photo frame. Different photo frames may have different lines, widths and thicknesses. The inner diameter is measured from the back of the photo frame, because the photo is put in from the back.

30-inch photo frames are divided into 20×30 inches (50.8×76.2cm) and 24×30 inches (6176.2 cm).

Extended data:

Conversion relationship between inches and centimeters:

1 inch =2.54 cm, 1 cm =0.3937008 inch.

One inch is the width of the average person's thumb at the bottom of the nail. Of course, people's thumb width is also different. /kloc-In the 4th century, King Edward II of England promulgated the "standard legal inch". Its regulation is: choose three largest grains from the middle of barley ears, and the length from head to head is one inch.

The centimeter is the unit of length measurement, which is equal to one hundredth of a meter.1cm =1100m. 1 cm = 10/0mm =0. 1 decimeter =0.0 1 meter. Centimeter is not an international unit.

Baidu encyclopedia -cm