What this calculator does
The Letter Grade from Percentage Calculator converts a numeric percentage score into a letter grade — A, B, C, D, or F — using the widely used 10-point grading scale common in US schools and colleges. Enter your percentage (for example, 87.5%) and the tool returns the corresponding letter grade along with an approximate 4.0-scale GPA point value.
How to use it
Type your overall percentage score into the box and submit. The percentage can include decimals (such as 88.4). The calculator compares your score against the standard cutoffs and shows the matching letter. Note that grading scales vary by institution; this tool uses the most common thresholds and should be treated as a guide rather than an official record.
The formula explained
The conversion is a simple set of thresholds applied to the percentage p:
$$\text{Letter} = \begin{cases} A & \text{Percentage} \geq 90 \\ B & 80 \leq \text{Percentage} < 90 \\ C & 70 \leq \text{Percentage} < 80 \\ D & 60 \leq \text{Percentage} < 70 \\ F & \text{Percentage} < 60 \end{cases}$$90 and above is an A, 80–89 is a B, 70–79 is a C, 60–69 is a D, and anything below 60 is an F. Each letter is then mapped to standard GPA points: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0. Some schools add plus/minus modifiers, but the core letter boundaries remain the same.
Worked example
Suppose you scored 85%. Because \(85\) is at least \(80\) but below \(90\), it falls into the B band. The calculator returns a letter grade of B and an approximate GPA of 3.0. A score of exactly \(90\) would tip up to an A, while \(59.9\) would round down to an F.
FAQ
Is 89.5% an A or a B? Under the strict 10-point scale shown here, \(89.5\) is a B because it is below \(90\). Rounding policies differ by teacher.
What about plus and minus grades? This calculator returns whole letters only (A–F). Plus/minus systems use narrower sub-ranges that vary widely between institutions.
Does this scale apply everywhere? No. It reflects the common US 10-point scale. Other countries and even individual schools use different cutoffs, so check your syllabus.
