How long is 685 feet?
The physical scale of 685 feet becomes clearer when it is compared with recognizable things whose dimensions have been published.
685-Foot Distance Comparisons
685 feet is about 8.8 times the length of a regulation tennis court.
The International Tennis Federation sets the court at 78 feet from baseline to baseline for both singles and doubles play. Its published measurement is 78 feet; the comparison comes from placing that figure against 685 feet.
Source: International Tennis Federation
A 685-foot distance works out to about 257 times the minimum clear width of an accessible doorway.
U.S. accessibility standards generally require at least 32 inches of clear passage width when an accessible door is opened. Using its published size of 2.67 feet, dividing 685 by that reference gives 257 of those measurements.
Source: U.S. Access Board
Measured against the length of a large Tyrannosaurus rex, 685 feet is about 17.1 times that reference length.
Smithsonian fossil information places a large adult Tyrannosaurus rex at roughly 40 feet from snout to tail. At 40 feet, this familiar reference provides a direct scale comparison: the target distance covers 17.1 of those measurements.
Compared with the wingspan of an Airbus A380, 685 feet is about 2.6 times that measurement.
The Airbus A380's enormous wings span 79.75 metres, equal to approximately 260.3 feet from tip to tip. The source measurement converts to 260.33 feet, so the proportional comparison with 685 feet is 2.6 of those measurements.
Source: Airbus
A distance of 685 feet is almost exactly the same length as the height of Hoover Dam.
Hoover Dam rises 726 feet from its foundation in Black Canyon and holds back the Colorado River to form Lake Mead. Its published measurement is 726 feet; the comparison comes from placing that figure against 685 feet.
Source: U.S. Bureau of Reclamation
Measured against the height of Elizabeth Tower at Big Ben, 685 feet is about 2.2 times that reference length.
The clock tower commonly called Big Ben stands approximately 316 feet above the Palace of Westminster. Using its published size of 316 feet, dividing 685 by that reference gives 2.2 of those measurements.
Source: UK Parliament
685 feet is about 25% of the height of the Burj Khalifa.
Dubai's Burj Khalifa rises 828 metres, or approximately 2,717 feet, from its base to architectural top. The source measurement converts to 2,717 feet, so the proportional comparison with 685 feet is 25% of that measurement.
Source: Burj Khalifa
685 feet is approximately 208.8 meters.
Using the exact conversion that 1 foot equals exactly 0.3048 meters, the unrounded result is 208.788 meters.
Reference measurements are rounded where appropriate, and naturally variable objects are described as approximate, typical, or maximum sizes.
