What is the approximate length of the Sistine Chapel’s interior?

The Sistine Chapel’s interior is approximately 41 metres long.

Published measurements commonly give the chapel an interior length of about 40.9 metres and a width of about 13.4 metres. Its proportions were designed to echo descriptions of Solomon’s Temple in the Old Testament, linking the Renaissance building to an important biblical architectural tradition.

The chapel’s height is approximately 20.7 metres. The long, relatively narrow space is covered by the famous barrel-vaulted ceiling, whose painted architecture makes the surface appear more complex than a simple vault. The altar wall rises at one short end and carries Michelangelo’s Last Judgment.

Measurements can vary slightly depending on whether a source describes the interior, exterior, or rounded architectural elements. The figure of about 41 metres is therefore the standard rounded answer for the interior length, rather than an exact claim that every measurement method produces the same result.