It depends on the school. Usually:

A range = 80-100
B range = 70-80
C range = 60-70
D range = 50-60
F range = 0-50

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-Stringer

Isn't every school different?

http://www.ouac.on.ca/omsas/pdf/c_omsas_b.pdf
has conversion from lettr to 4.0 scale to % for like.. med students

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lol anything below a C is a fail?
Are there also bell curves?

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Actually a C is 55-60. We essentially use percentages in course, but at the end of the course its translated into letters and thats all that shows up on the transcript. From there the gpa number system is used to calc GPA.

85-100 A 4
80-84 A- 3.7
75-79 B+ 3.3
70-74 B 3.0
65-69 B- 2.7
60-64 C+ 2.3
55-59 C 2.0
50-54 D 1.0
< 49 F 0

Oh and the profs here will never lower class marks to fit a curve. Worst case scenario: you have a really bittter prof who will make an impossible exam and then adjust the grades to match the avgs of previous years( if the prof has been teaching the same course for a while its usually the lowest acceptable avg mcgill will tolerate, like a c/c+ ). In other cases like with newer profs, a few will make an unreasonable exam and realize it afterwards and they'll adjust it give fair and reasonable outcomes . The harder courses in first year science will be curved up, while the easier ones wont. In arts, dont quote me though, Ive been told the whole thing revolves around curving.

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Mcgill BSc 2010

The OMSAS chart is a standard thing used to convert everyone to the same GPA scale. It does not reflect all the intricacies of different marking schemes (e.g. the column applicable for a school may include grades that they don't give out), and just because a percentage grade range from the column covering most of the school using percentages matches up with a letter grade for the column covering most of the schools with letter grades doesn't mean that's the exact grade range used by all the schools.

Most schools fall into the ranges that Stringer posted with slight differences in the cutoffs for +/- grades particularly in the A range, with - representing the low end, unmodified representing the middle, and + the high end of the range. Not all schools use + and/or - grades although most if not all use at least one.

At Acadia, D- is a pass but often you need at least C- in courses to take courses that require it or if it's a degree requirement and not an elective - if you got a D in first semester calculus, you'd have to re-take it in order to be able to take second semester calculus, but you did get the credit for it so if you switched to a program that didn't require calculus you wouldn't need to pick up an extra credit like you would if you got an F.


Ottawa's Scale (Weird 10 point GPA system)
A+ 90 - 100% 10 points
A 85 - 89% 9 points
A- 80 - 84% 8 points
B+ 75 - 79% 7 points
B 70 - 74% 6 points
C+ 66 - 69% 5 points
C 60 - 65% 4 points
D+ 55 - 59% 3 points
D 50 - 54% 2 points
E 40 - 49% 1 point
F 0 - 39% 0 point

Acadia's Scale (More typical 4 point GPA system)
A+ 4.00 94 - 100
A 4.00 87 - 93 Excellent
A- 3.67 80 - 86

B+ 3.33 77 - 79
B 3.00 73 - 76 Good
B- 2.67 70 - 72

C+ 2.33 67 - 69
C 2.00 63 - 66 Average
C- 1.67 60 - 62

D+ 1.33 57 - 59
D 1.00 53 - 56 Pass
D- 0.67 50 - 52

F 0.00 0 - 49 Failure

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Remember that it often takes just as long to do a search or two on Google to try and find the answer to your question as it takes to type it in a post here, let alone the time waiting for a reply.
If your question is "What mark does it take to get into University X", or "What are the requirements to get into University X", it's on their website and/or electronicinfo.ca (for Ontario schools). Particularly for Ontario schools, those ranges are a pretty good picture of what kind of mark will get you into the program, and if you're more than a couple percent higher it's practically guaranteed unless it requires a supplementary form.