GPA Scale Converter

About this converter

Compare the same relative position on three numeric scales. This is a normalized scale conversion for general comparison. It does not determine the GPA a school or admissions office would assign to your transcript.

How to use

Enter your value, select its From scale, then select a To scale. The primary result updates immediately; the comparison panel shows all three equivalents. No school, course list, credits or account is required.

Copy Result copies the visible conversion with its percentage and context. Reset restores the example: 3.72, from 4.0 to 5.0. Invalid values clear all numeric results until corrected. Changing the source scale keeps your entered value and checks it against the new maximum.

The initial example, formula, explanations and FAQs are server-rendered. JavaScript is required for interactive conversion and Copy Result.

How this conversion works

converted = (value / source scale maximum) × target scale maximum

First divide by 4, 5 or 100 to find the fraction of the source scale. Multiply that fraction by the target maximum. This preserves relative position: a value at 90% of one scale remains at 90% of another.

For 3.72 on a 4.0 scale: 3.72 ÷ 4 = 0.93. Then 0.93 × 5 = 4.65 on the 5.0 scale, and 0.93 × 100 = 93% of the selected scale. Same-scale conversion returns the input value unchanged. We retain full calculation precision and display at most four decimal places.

4.0 vs 5.0 GPA

A 4.0 scale is common for unweighted GPA. Some weighted systems award extra points for advanced courses and may use values up to 5.0. The maximum alone does not explain a school’s grading rules. See the College Board GPA guide (opens in a new tab).

This converter treats 4 and 5 as numeric maxima. Multiplying a 4.0-scale value by 1.25 preserves its proportion; it does not apply course-specific weighting.

Is GPA-to-percentage conversion exact?

There is no universal GPA-to-course-percentage mapping. Here, normalized percentage = value ÷ source maximum × 100. A 3.72 / 4.0 input therefore produces 93% of the selected GPA scale.

This percentage is a mathematical rescaling of the GPA scale, not an official course-grade percentage. Schools may map percentages and GPA differently.

Letter-grade bands, plus/minus systems and different cutoffs can produce non-linear mappings. The College Board example (opens in a new tab) describes one grading system and advises checking school policy. We do not turn that example into a universal conversion table.

Percentage to GPA

Choose Percentage / 100 as the source. For the 4.0 scale, calculate percentage ÷ 100 × 4; for 5.0, calculate percentage ÷ 100 × 5. Thus 93% becomes 3.72 / 4.0 or 4.65 / 5.0 under this normalization.

If your input is an actual course-grade percentage, a school’s official GPA mapping may give a different result. This operation only expresses that number on a different maximum; it does not look up institutional grade bands.

Weighted vs unweighted GPA

Unweighted GPA generally treats course levels alike; weighted GPA may give advanced coursework additional points. The College Board glossary’s weighted GPA entry (opens in a new tab) explains the distinction.

This calculator rescales between maximum values. It does not reconstruct a school’s weighted GPA. That would require course-level grades, credits, grade mappings and weighting rules. A course-by-course GPA calculator is outside this tool’s scope.

Colleges may recalculate GPA using their own course selections and weighting criteria; consult the receiving institution before reporting a converted value.

Assumptions and limitations

All scales start at zero and end at the selected maximum. Supported ranges are 0–4, 0–5 and 0–100, including both endpoints. Values above the maximum are rejected rather than clamped; for example, a GPA above 5 cannot be represented by this MVP.

Use digits and a decimal point. Empty values, negatives, scientific notation, commas, nonfinite numbers and mixed text are rejected. Spaces alone are not a number. Surrounding whitespace is ignored, following the site’s input convention.

These are normalized equivalents, not institution-specific GPA recalculations. No letter-grade or academic-range judgment is assigned. For official reporting, follow your school or admissions office’s instructions.

Calculation happens locally in this browser tab. Inputs are not saved, sent to a calculation service or placed in the URL. Copy exports only the visible input, result, normalized percentage and explanatory context when you press the button.

Worked examples

3.72 on a 4.0 scale

3.72 ÷ 4 = 0.93; 0.93 × 5 = 4.65. Normalized percentage: 93%. Reversing from 4.65 / 5.0 returns 3.72 / 4.0.

3.6 on a 4.0 scale

3.6 ÷ 4 = 0.9; 0.9 × 5 = 4.5. Both values represent 90% of their respective scale maxima.

Endpoints and unchanged scales

Zero converts to zero on every scale. The maxima 4 / 4.0, 5 / 5.0 and 100% are normalized equivalents. Selecting the same source and target leaves the underlying value unchanged.

GPA conversion FAQ

How do I convert a 4.0 GPA to a 5.0 scale?

Divide by 4 and multiply by 5. This gives a normalized comparison, not a school-specific weighted GPA.

Is 3.6 on a 4.0 scale equal to 4.5 on a 5.0 scale?

Yes, under linear normalization: 3.6 ÷ 4 × 5 = 4.5. Both are 90% of the chosen maximum.

How do I convert GPA to percentage?

Divide by the GPA scale maximum and multiply by 100. Label the result a normalized percentage or percentage of the selected scale.

Is GPA-to-percentage conversion universal?

No. This arithmetic is defined for the selected maxima; official grade mappings depend on the institution.

What is the difference between a 4.0 and 5.0 GPA?

In this tool, they are scales with different maxima. At a school, the difference can also involve course weighting and grading policies.

Is a 5.0 GPA always weighted?

The scale label alone is insufficient. Read the school’s policy to learn what its numbers mean and whether courses receive extra weight.

Can colleges recalculate my GPA?

Yes. Their criteria may differ from your school’s. Ask the admissions office what to report.

Is this calculator official for admissions?

No. It offers an estimated scale conversion. Use your transcript and the institution’s reporting instructions for applications.

Why might my school show a different result?

Its grade bands, course credits, plus/minus rules or advanced-course weighting may differ from this simple proportional model.

Can I convert percentage back to GPA?

Yes. Divide the percentage by 100, then multiply by 4 or 5. This reverses normalization, but does not establish an official course-grade equivalence.

Sources and methodology review

Methodology checked September 30, 2026. These sources explain grading-policy context. The linear normalization, input limits and display precision are this tool’s stated implementation choices. College Board does not endorse this calculator.

• College Board / BigFuture: How to Calculate Your GPA on a 4.0 Scale (opens in a new tab)
• College Board / BigFuture: College Admission Glossary (Weighted GPA) (opens in a new tab)