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Gradebook Calculator

Gradebook calculator works out Score and Letter grade from Points earned, Points possible and Questions answered wrong. The default figures on this page give score of 84.00 %; change any entry and the result, the working and the sources update together.

Score
84.00 %
Test Grade Calculator
Letter grade
B
Grade points (4.0 scale)
3.00
Points earned
42
Points possible
50
Points lost
8
Score before the curve
84.0000 %
Passing?
Yes
Grading scale used
10-point scale with plus/minus
Worked out from University of California - Admissions, GPA requirement: how to calculate your UC GPA and 5 other sources.

Your figures

Updates as you type
Used when entering points earned out of points possible.
In wrong-answer mode this is the number of questions on the test.
Used only in wrong-answer mode.
One item per line as "Name: score, weight". The weight may be a percentage of the course, a point value, or anything proportional. A score may be written 88, 88% or 44/50. Leave the weight off for an item that counts once. In average mode every weight is taken as 1.
Answer-key mode: the marks each correct question is worth.
Answer-key mode: marks deducted for each wrong answer. Take this from the official notification for your exam - it is not the same for every paper.
Answer-key mode: unattempted questions score nothing and are not penalised.
Answer-key mode: extra marks for partly correct answers, added after the negative marking.
Percentage points added to the raw score before the letter is assigned.
Letter:minimum percent pairs, e.g. "A:93, A-:90, B+:87, B:83, F:0".
The rounded percentage is what the letter grade is assigned from, matching gradebook practice.

How this is worked out

4 steps
  1. Points earned = 42 of 50 possible
  2. Percentage = 42 / 50 x 100 = 84%
  3. Rounded to 0 decimal place(s): 84%
  4. On the 10-point scale with plus/minus, 84% is a B.
Score needed for each gradetable
letterminPercentminPoints
A+9748.5
A9346.5
A-9045
B+8743.5
B8341.5
B-8040
C+7738.5
C7336.5
C-7035
D+6733.5
D6331.5
D-6030
F00

Figures from grade point scales, checked 31 August 2026. Its 10 worked examples are re-run on every release, last on 15 September 2026. What changed · how reference data is kept current

Sources and references

6 sources
University of California - Admissions, GPA requirement: how to calculate your UC GPA
Source for the UC scale: A=4, B=3, C=2, D=1, pluses and minuses do not count; one extra point per semester of a UC-approved honors course, D and F earn no honors point; at most 8 honors points between 10th and 11th grade and at most 4 of them from 10th grade; only a-g courses taken from the summer after 9th grade through the summer after 11th grade count.
US Department of Education, National Center for Education Statistics - High School Transcript Study methodology, standard grade-point conversion
Source for the conventional unweighted 4.0 scale used to convert transcript letter grades to grade points (A=4.0, B=3.0, C=2.0, D=1.0, F=0.0).
College Board - How to Convert Your GPA to a 4.0 Scale
Source for the plus/minus 4.0 scale (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) and the letter-to-percentage bands used with it.
National Association of Secondary School Principals / common US district practice - the 10-point and 7-point percentage grading scales
The 10-point scale (A 90-100, B 80-89, C 70-79, D 60-69, F below 60) is the dominant US convention; the 7-point scale (A 93-100, B 85-92, C 77-84, D 70-76, F below 70) is used by a minority of districts. Both are published district policy rather than a national standard, so the engine lets the user edit the cut-offs.
Weighted arithmetic mean: weighted_mean = sum(value x weight) / sum(weight)
The standard definition used for a weighted gradebook, matching the WEIGHTED-MEAN contract in the research corpus.
GED Testing Service, Understanding Your Scores: 100-200 score scale, 145 passing, 165 GED College Ready, 175 GED College Ready + Credit
Used only by the GED preset, expressed as percentages of the 200-point scale (145/200 = 72.5%, 165/200 = 82.5%, 175/200 = 87.5%).

What the gradebook calculator calculates

Converts a test or assignment score into a percentage and a letter grade on the grading scale you choose, averages a gradebook with or without category weights, scores an answer key with negative marking, and shows the score needed for every other letter.

How to use this gradebook calculator

Enter Points earned, Points possible, Questions answered wrong and Graded items. Score updates as you type. Change one figure at a time to see what drives the result.

How the result is worked out

Open “How this is worked out” beside the result for the step-by-step calculation behind Score, Letter grade and Grade points (4.0 scale).

The method follows University of California - Admissions, GPA requirement: how to calculate your UC GPA, US Department of Education, National Center for Education Statistics - High School Transcript Study methodology, standard grade-point conversion, College Board - How to Convert Your GPA to a 4.0 Scale, National Association of Secondary School Principals / common US district practice - the 10-point and 7-point percentage grading scales and Weighted arithmetic mean: weighted_mean = sum(value x weight) / sum(weight).

What you can compare

Change one input at a time to see how it affects Score, Letter grade and Grade points (4.0 scale). The inputs you can vary are Points earned, Points possible, Questions answered wrong, Graded items, Marks per correct answer and Negative marking per wrong answer.

Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.

Embed this calculator on your website

Copy this code into any page. The calculator appears with the figures currently entered, sizes itself to fit, and a small credit line links back here. Free, no account, no ads inside it, no tracking of your readers. Set your own figures and fixed fields; Personal removes the credit line, sets your colour and shows you which sites use it.

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Frequently asked questions

How to calculate gradebook?

Converts a test or assignment score into a percentage and a letter grade on the grading scale you choose, averages a gradebook with or without category weights, scores an answer key with negative marking. Open “How this is worked out” beside the result to see each step for your own figures.

What information do I need for the gradebook calculator?

You need Points earned, Points possible, Questions answered wrong, Graded items, Marks per correct answer, Negative marking per wrong answer, Questions left unattempted and Partial credit awarded. The page opens with default figures that give score of 84.00 %, so you can see the scale before entering your own.

What does this gradebook calculator show?

It shows Score, Letter grade, Grade points (4.0 scale), Points earned, Points possible, Points lost, Score before the curve and Passing?, with the working and any warnings for your entries.

Can I check how the gradebook calculator result was calculated?

Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.

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