Here is a summary of the Calvin Cycle-
The product of the cycle is a 3 carbon sugar (PGAL)
Cycle must occur 3 times to make a 3 carbo sugar
Cycle begins with CO2 added to RBP. - this produces a 6 carbon intermediate.
It splits into 2, 3-carbon molecules
These 3 carbon molecules are phosphorylated by ATP and reduced by NADPH to give glyceraldehyde 3- phosphate (PGAL)
2 PGAL are converted to glucose
In short,
In 6 turns of the cycle, 12 PGAL for 6 RBP and 1 molecule of glucose
Does this help?
Best,
dantheman2007