Standards-Based Grading Calculator v2.2

grades = [0]
print("Input grades as 2-digit integers with a space between each entry, then press enter. Example: 32 32 32")
counter_gradenumber = 0
inputgrade = input("")
repeatcounter = inputgrade.count(" ")
rawgrade = inputgrade.replace(" ", "")
#if repeatcounter >= 1:
#    repeatcounter = repeatcounter + 1
charstart = 0
charend = 2
testvar = rawgrade[charstart:charend]
while repeatcounter >= 0:
    grades.append(int(rawgrade[charstart:charend]))
    charstart = charstart + 2
    charend = charend + 2
    counter_gradenumber = counter_gradenumber + 1
    repeatcounter = repeatcounter - 1
if grades[0] == 0:
    grades.pop(0)
countersave = counter_gradenumber
sumgrade = 0
counter_gradenumber = counter_gradenumber - 1
while counter_gradenumber >= 0:
    #since the end result is divided by countersave, which is base 10 starting at 1, but the list is modified by counter_gradenumber, which starts at 0, counter_gradenumber needs to be 1 smaller than countersave
    sumgrade = sumgrade + int(grades[int(counter_gradenumber)])
    counter_gradenumber = counter_gradenumber - 1
actualsumgrade = sumgrade/10
avggrade = actualsumgrade/countersave
finalgrade = (avggrade * 15) + 40
print("Average Standards-Based Grade:")
print(avggrade)
print("Converted to conventional grade:")
print(finalgrade)