Grade Scale Converter

Introduction

Letter grades, percentage cutoffs, and GPA points describe the same performance in different formats — yet schools, scholarship applications, and transfer credit evaluations rarely use just one. A student might know they earned 87% but need the letter equivalent for a form, or hold a 3.3 GPA and wonder what percentage range that represents on their institution's scale.

Certoflow's Grade Scale Converter bridges these formats on the standard US 4.0 scale with plus/minus letter grades. Convert letter to percentage, percentage to letter, letter to GPA, or GPA to letter — all in your browser with no sign-up and no data stored.

What this tool does

Four conversion modes cover the most common grading translation tasks:

Mode	Input	Output
Letter → Percentage	Letter grade (A+ through F)	Approximate percentage and GPA
Percentage → Letter	Score 0–100	Letter grade and GPA
Letter → GPA	Letter grade	Grade points on 4.0 scale
GPA → Letter	GPA 0–4.0	Letter grade and approximate percentage

Results update live as you change inputs or switch modes.

How it works

Letter grades map to grade points on the US 4.0 scale:

Letter	Grade points
A+ / A	4.0
A−	3.7
B+	3.3
B	3.0
B−	2.7
C+	2.3
C	2.0
C−	1.7
D+	1.3
D	1.0
D−	0.7
F	0.0

Percentage conversions use the same letter-grade bands as Easy Grader (A ≥ 93%, B ≥ 83%, etc.). GPA-to-percentage uses a linear mapping: (GPA ÷ 4) × 100.

Real-world examples

Scholarship form asks for GPA but you only know your percentage. Enter 91% in Percentage → Letter mode to see A− (3.7 GPA).

Transfer student comparing scales. Convert each course letter to GPA points, then use GPA Calculator to model cumulative standing.

Teacher explaining cutoffs. Show students that 83% maps to B on the standard scale used by this converter.

Common mistakes

Assuming your school's cutoffs match exactly. Some institutions use A at 90% instead of 93%. Verify against your official grading policy.

Treating GPA-to-percentage as official transcript data. The linear mapping is an approximation for quick reference, not a registrar-certified conversion.

Mixing weighted and unweighted GPA. This tool uses standard 4.0 grade points — weighted honors scales may differ.

Practical use cases

• Parents helping students interpret report card percentages
• Advisors translating between high school and college grading cultures
• Students completing applications that request different grade formats
• Teachers standardizing quiz scores before entering gradebooks

Frequently asked questions

Does this use my school's exact grade scale?

It uses a common US 4.0 scale with standard letter bands. Your institution may differ — verify against official policy.

Can I convert a percentage to GPA?

Yes. Use Percentage → Letter mode to see the letter grade and corresponding GPA points.

Is this the same as the GPA Calculator?

No. GPA Calculator computes weighted averages across multiple courses. This tool converts single values between formats.