313 centimeters is equivalent to 123.23 inches.
To put this into perspective, here are some comparisons to known objects of similar size:
1) The average height of an adult male in the United States is 176.1 cm (69.3 inches), so 313 cm is just over half the height of an adult male.
2) The length of a standard twin size bed is 99 cm (39 inches), so 313 cm is over three times the length of a twin size bed.
3) The length of a standard bowling lane is 60 feet (720 inches), so 313 cm is less than a sixth of the length of a bowling lane.
4) The diameter of a basketball is 24 cm (9.44 inches), so 313 cm is over 13 times the diameter of a basketball.
5) The length of a newborn baby is typically around 51 cm (20 inches), so 313 cm is over six times the length of a newborn baby.