Percentage To Letter Grade Converter

Percentage to letter grade converter to convert a numeric score or percentage into a letter grade using popular grading schemes like US (A–F), UK, ECTS, and AUS. The tool also normalizes scores from any scale (like 17/20 or 8.5/10) into a standard 0–100% percentage.

Primary letter scheme

Letter thresholds (minimum %)

A+ % A % A- % B+ % B % B- % C+ % C % C- % D+ % D % D- % F %

Primary conversion

88.00%

Letter grade

B+

Scheme

US Letters

Your grade converts to a mid-range letter (often B or C), but details depend on the institution’s exact thresholds.

Your grade & scale

Grade (numeric) Scale (max value) Examples: 85 / 100, 17 / 20, 8.5 / 10. The converter normalises everything to a 0–100% scale.

Normalised percentage (0–100%)

88.00%

This is your grade expressed on a 0–100% scale.

Letter grades across schemes

Scheme	Letter	Threshold
US Letters (A–F, +/-)	B+	At least 87.00%
UK Classes (First/2:1/2:2/Third)	First	At least 70.00%
ECTS (A–F/FX)	B	At least 80.00%
AUS (HD/D/CR/P/NN)	HD	At least 85.00%

Formula: Convert Marks to Percentage (Normalize Any Scale)

If your score is not already a percentage (for example, 18/25), the tool uses this normalization formula:

Normalization Formula

Normalized Percentage (%) = (Grade ÷ Scale) × 100

Example

If you scored 17 out of 20:
Normalized % = (17 ÷ 20) × 100 = 85%

Then the converter assigns a letter grade using the selected scheme’s thresholds.

Explore More Calculators on Grade Calculator Tools

If you want deeper calculations beyond a single conversion, try these related tools:

Grade Calculator – calculate overall course grades using weighted categories.
Percentage to GPA Converter – convert percentage into GPA on common scales.
5.0 Scale GPA Calculator – compute GPA across courses with a 5.0 max scale.