How to Use the GPA Calculator

The Tooldit GPA Calculator works entirely in your browser — type in your courses and grades, and the GPA updates instantly. There is no "Calculate" button to hunt for and nothing is ever sent to a server.

Pick a mode at the top: Unweighted (standard 4.0 scale used by most US colleges) or Weighted (5.0 scale, common in US high schools that boost AP, IB, and Honors classes).
Type a course name — this is optional and only used to keep the list readable for you.
Choose the letter grade from the dropdown. The GPA points are shown next to each letter (A = 4.0, B+ = 3.3, etc.).
Enter credit hours — typically 3 or 4 for a full course, or 1 for a lab. The input accepts half-credit values like 1.5.
Hit + Add Course to add more rows. Your GPA, total credits, classification badge, and the visual scale bar all update live as you type.

What is GPA?

GPA, or Grade Point Average, is the standard measure of academic performance used by US schools, colleges, and universities. Each letter grade is mapped to a number on a 4.0 scale — an A is worth 4.0, a B is worth 3.0, and so on — and your GPA is simply the credit-weighted average of those numbers across all the courses you've taken.

The system was first introduced at Cambridge in the late 1700s by tutor William Farish, who needed a quicker way to grade large lecture classes than reading every essay end-to-end. American schools adopted variations of the same idea throughout the 1800s and 1900s, eventually settling on the modern 4.0 scale.

Your GPA matters in a lot of practical decisions: college admissions committees use it as a baseline filter, scholarship boards require minimums (often 3.0+ or 3.5+), employers check it on resumes for entry-level roles, internships have GPA cutoffs, and graduate school applications often require a minimum 3.0 cumulative GPA. Maintaining academic standing — and avoiding probation — also comes down to GPA.

How GPA is Calculated

The formula looks like this:

GPA = Σ(grade points × credit hours) ÷ Σ(credit hours)

In plain English: multiply each course's GPA value by its credit hours to get its "grade points", sum the grade points across all courses, then divide by the total credit hours. Bigger courses (4 credits) move the average more than smaller ones (1 credit) — which is exactly what you want.

Here's a worked example for a typical four-course semester:

Course	Grade	Credits	Grade Points
English Lit	A (4.0)	3	12.0
Calculus	B+ (3.3)	4	13.2
Chemistry	B (3.0)	4	12.0
History	A- (3.7)	3	11.1
Totals		14	48.3

GPA = 48.3 ÷ 14 = 3.45. That's a solid "Good" semester — above average, just below the typical "very good" cutoff at 3.5.

Standard GPA Grading Scale

This calculator uses the most widely accepted US grading scale. Some schools tweak the boundaries — particularly whether A+ counts as 4.0 or 4.3 — but the table below covers the overwhelming majority:

Letter Grade	Percentage Range	GPA Points
A+	97–100	4.0 (some schools 4.3)
A	93–96	4.0
A-	90–92	3.7
B+	87–89	3.3
B	83–86	3.0
B-	80–82	2.7
C+	77–79	2.3
C	73–76	2.0
C-	70–72	1.7
D+	67–69	1.3
D	65–66	1.0
F	Below 65	0.0

Weighted vs Unweighted GPA

The big distinction in US high school GPA reporting is between unweighted and weighted GPA.

Unweighted GPA treats every class the same way: an A is 4.0 whether the course is regular biology or AP Chemistry. The maximum possible unweighted GPA is 4.0. This is how almost all colleges calculate GPA internally — it lets admissions teams compare students from very different schools on a fair scale.

Weighted GPA gives extra credit for harder classes, typically +0.5 for Honors and +1.0 for AP or IB courses. So an A in an AP class could be worth 5.0, and the maximum possible weighted GPA in a 5.0-scale system is 5.0. Some districts use a 4.5 ceiling for Honors and a 5.0 ceiling for AP/IB; the calculator above uses the most common scheme.

Why does the difference matter? Two reasons. First, your high school transcript usually shows both numbers, so applications and scholarship forms ask for one specifically — read carefully. Second, weighted GPAs reward you for taking harder classes, which is exactly the signal admissions teams look for: a 4.5 weighted GPA from a schedule full of AP classes typically beats a 4.0 unweighted GPA from an easier schedule.

GPA by Education Level

Elementary & middle school: Most US schools at this level don't calculate a formal GPA. Report cards typically use letter grades or 1–4 standards-based scores.
High school: Standard 4.0 unweighted scale, with a parallel weighted GPA up to 5.0. Both are reported on transcripts.
College / undergrad: Standard 4.0 scale, almost always unweighted. Most schools require a 2.0 cumulative GPA to graduate; below 2.0 puts you on academic probation.
Graduate school: Same 4.0 scale, but the bar is higher — most master's and doctoral programs require a 3.0 minimum cumulative GPA to stay in good standing.
Professional schools (med, law, business): Top-tier programs typically expect a 3.5+ cumulative GPA from undergrad, alongside competitive standardised test scores (MCAT, LSAT, GMAT, GRE).

What is a Good GPA?

A "good" GPA is contextual — your school's competitiveness, the difficulty of your courses, and your chosen field all factor in — but here's a useful baseline:

4.0: A perfect record. At most schools this is rare and usually means top of the graduating class.
3.7 – 3.9: Excellent. Roughly the top 10%. Very competitive for selective colleges, scholarships, and graduate programs.
3.5 – 3.69: Very good. Roughly the top 20%. Strong for most college applications, dean's list at many schools.
3.0 – 3.49: Good — clearly above average. Meets the minimum for most internships and graduate programs.
2.5 – 2.99: Average. You'll meet the bar for graduation almost everywhere, but selective programs and scholarships will be a stretch.
2.0 – 2.49: Below average. Most colleges require a 2.0 minimum to graduate; you're close to the line.
Below 2.0: Academic warning at most US schools. Talk to your advisor — there are usually clear paths to recover.

Keep in mind: GPA is one signal among many. Course rigour, the competitiveness of your school, your major, and what you do outside of class — research, internships, projects, leadership — all weigh into how admissions and employers read your record. A 3.4 in an honours engineering programme can be more impressive than a 3.9 in an easier major.

Frequently Asked Questions

+What's the difference between cumulative and semester GPA?

Semester GPA is the average for a single term — your grades from one fall or spring semester. Cumulative GPA is the running average across every semester you've completed so far, weighted by credits. The cumulative number is what appears on your transcript and what colleges and employers actually look at. Use the "Add previous GPA" section above to combine your existing cumulative with this semester's GPA.

+How do I calculate weighted GPA?

Same formula as unweighted — sum of (grade points × credits) divided by total credits — but Honors classes get a +0.5 bonus on the grade points and AP/IB classes get +1.0. So an A in an AP class is worth 5.0 instead of 4.0. Toggle to "Weighted" mode at the top to get the class-type dropdown for each course.

+Do colleges look at weighted or unweighted GPA?

Both, but unweighted is usually the number they care about. Most college applications report your unweighted GPA so they can compare you fairly against students from schools with different weighting policies. That said, your transcript shows both — and the rigour of your course schedule (lots of AP, IB, or Honors) is what makes a weighted GPA meaningful to admissions readers.

+How can I raise my GPA?

The math is unforgiving once you have a lot of credits behind you — every new course pulls the average a smaller amount. Practical tactics: pick up extra credits in courses where you'll do well, retake courses where your school's policy lets the new grade replace the old (not all schools allow this), use office hours and tutoring early in the semester, and when allowed, take a Pass/Fail option for courses outside your major where a bad grade would do real damage.

+What grading scale does this calculator use?

The standard US 4.0 scale — A/A+ = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, and so on down to F = 0.0. In Weighted mode, Honors classes add +0.5 and AP/IB classes add +1.0 (capped to non-failing grades — failing an AP class doesn't earn a bonus).

+Can I save my calculation?

You can use the Copy button to copy a clean text summary to your clipboard, or the Print button to print or save to PDF via your browser's print dialog. There's no account or cloud save — by design, nothing leaves your browser.

+Is my data private?

Yes. The calculator runs entirely on your device — no courses, grades, or credit hours are ever sent to a server. There's no logging, no analytics tied to the values you enter, and refreshing the page wipes the inputs.

+Does this work for international grading systems (10-point, percentage)?

The calculator uses the US 4.0 scale, so it works directly for most American high schools, colleges, and universities. For 10-point Indian university scales, percentage-based systems, or European grading like the German 1.0–5.0 scale, you'll need to convert your grades to US letter equivalents first. As a rough guide: 90%+ = A, 80–89% = B, 70–79% = C, 60–69% = D. Your school's registrar or international admissions office can give you the official conversion they recognise.