Is a 70 a C?
A 70% is a C− with plus/minus grading and a C on a whole-letter scale — passing for credit at most schools, but often below what a major requires.
On the standard US scale, 70% is the bottom of the C range. Whether it shows as a C or a C− depends on which scale your course uses.
Whole-letter vs plus/minus
On a whole-letter scale, a C covers 70–79%, so a 70 is a C. On a plus/minus scale, 70–72% is a C−, 73–76% is a C, and 77–79% is a C+. So a 70 is a C− there. Either way it is a C-range grade, worth about 1.7–2.0 grade points.
Does a 70 pass?
For course credit, usually yes — most schools pass at 60% (a D) or 70% (a C). But “passing the class” and “counting toward your major” are different bars. Many programs require a full C (73%) or better in required courses, and a C− may not transfer or satisfy a prerequisite. The rule lives in your program handbook. See what is a passing grade.
Where 70 sits
A 70% is 10 points above a failing 60% and 3 points below a solid C (73%). If your course needs a C to count, a 70 clears a whole-letter scale but falls just short on a plus/minus one.
Check your course’s scale
Your syllabus sets the exact cutoffs — some start a C at 73, some at 70. Enter any score in the percentage to letter grade tool to see its letter on the standard scale, then apply your course’s lines.