Caltech Grading Scale: All You Need to Know

Getting into Caltech means stepping into one of the most demanding classrooms anywhere. To do well, you need a solid grasp of how the grading system works. At Caltech, an A+ equals 4.3 and an F equals 0.0. Each course also carries units, and those units determine how much weight a grade adds to your GPA.

In this blog, you’ll learn how the Caltech grading scale works, what each letter grade means, and practical ways to keep your GPA in good shape.

• What Is the Caltech GPA Scale?
• Other Types of Grades at Caltech
• How to Get Good Grades at Caltech
• Frequently Asked Questions
• Takeaways

What Is the Caltech GPA Scale?

Caltech doesn’t follow the standard 4.0 scale that most American universities use. Instead, grades range from A+ at 4.3 down to F at 0.0, which means your GPA can rise slightly above the typical maximum at other schools.

Here’s how Caltech’s grading scale defines each letter grade and what it says about your work:

You’ll also see plus and minus grades (like B+ or A–), which let professors show finer differences in performance. The only exception is the D–, which Caltech doesn’t use. Both undergraduates and graduate students are graded using this same system.

At Caltech, grade point average (GPA) is calculated by dividing total grade points by total units. Since units reflect workload, heavier classes count more toward your average than lighter ones. For example, a three-unit class where you earn a B (3.0) affects your GPA more than a one-unit seminar. The same goes for a heavy nine-unit course—it can raise or lower your average far more than a small elective.

Pass/fail courses are handled differently. A Pass (P) gives you the units but no grade points, while an F makes you lose the units without lowering your GPA. We’ll go into more detail on this later when we cover the other types of grades at Caltech.

To make this clearer, here’s a chart showing how many grade points you earn at Caltech based on your letter grade and the number of units in a course:

This shows why unit-heavy courses matter so much in the Caltech grading scale. A strong grade in a nine- or twelve-unit class can lift your average significantly, while a weak grade can drag it down just as fast.

Sample calculation

Imagine you’re taking three classes in one term:

• 9-unit course: A (4.0) → 9 × 4.0 = 36 grade points
• 6-unit course: B+ (3.3) → 6 × 3.3 = 19.8 grade points
• 3-unit course: C (2.0) → 3 × 2.0 = 6 grade points

Step 1: Add them up → 36 + 19.8 + 6 = 61.8 total grade points.

Step 2: Divide by total units → 61.8 ÷ 18 = 3.43 GPA.

Your GPA for that term comes out to 3.43.

To stay in good standing, Caltech requires a minimum GPA of 1.9 each term in order to continue enrolling. An overall GPA of 1.9 is also required for graduation. That’s roughly equivalent to a C average, so keeping your grades steady across unit-heavy classes is key.

Finally, every Caltech course comes with an official unit count, which represents how much time you’re expected to spend each week. This includes lecture or lab hours plus outside preparation.

For example, a nine-unit class might mean three hours in lecture and six hours of homework or lab work per week. Since grade points are multiplied by units before being averaged, these numbers directly shape your GPA.

Other Types of Grades at Caltech

The Caltech grading scale also uses grades like P (Pass), E (Conditioned), and I (Incomplete) to mark special situations. These don’t always affect your GPA the same way, but they still matter for your academic record.

E grades

An “E” grade means you didn’t finish all the work for a class, but you’re allowed to make it up without retaking the course. By default, you have until Add Day of the next term to complete the work, unless your instructor sets an earlier deadline.

If you miss the deadline, the “E” automatically turns into an “F”. In some cases, especially if it affects your academic standing, the work may need to be done by the first day of classes in the following term.

You can request an extension with your instructor’s written permission, but every extension records an additional “E” grade on your transcript. It’s your responsibility to make sure the registrar has the updated terms and deadlines on file.

Grades of “E” are not considered in calculating your GPA.

I grades

An I (Incomplete) grade is given only when an unexpected illness or emergency near the end of the term prevents you from finishing a class. It’s not meant to cover missed work from most of the term. If you haven’t completed the majority of the course, you’ll likely be advised to late drop or take a leave instead.

An “I” grade is granted at the instructor’s discretion, but it also requires approval from the dean (or associate dean) of students, or the dean of graduate studies. If the reason is tied to a disability that worsened near the end of the term, you’ll need to work with Caltech Accessibility Services for Students (CASS).

The deadline for completing the work should be noted by your instructor. If not, you automatically have until Add Day of the next term. Make sure to check the Caltech academic calendar so you know exactly when Add Day falls each term.

Note that if the “I” affects your academic standing, you may need to finish the work by the first day of classes.

Similar to E grades, an Incomplete isn’t taken into account when calculating your GPA.

Pass/Fail grades

The Caltech grading scale uses Pass (P) and Fail (F) grades in several contexts.

For first-year students, all Core classes in the first two terms are graded on a pass/fail basis. Even if an instructor assigns letter grades, the registrar records a “P” for any passing work. This policy also applies to certain introductory courses, including:

• Bi 8
• Ma 2
• Ma 3
• Ph 2ab
• Ph 12ab
• Ch 41ab

These grades don’t count toward the GPA, which officially begins at the end of the third term of the first year. Pass grades are also used in many research and seminar courses where traditional letter grades don’t apply.

An “F” means you earn no credit for the course and must repeat it if you want the credit to count toward graduation. If you fail a class that was taken on a pass/fail basis, the grade will appear as “F*” on your transcript.

This type of failure doesn’t count toward your GPA, but you also don’t earn the units. One more detail to keep in mind is that if an instructor does not submit a grade for a pass/fail course, the registrar will automatically record an “F”.

How to Get Good Grades at Caltech

So now you know how Caltech’s grading scale works. Keeping a strong GPA, though, takes more than talent. With heavy unit loads and fast-paced classes, you’ll need solid study habits, effective stress management, and good use of campus resources.

1. Be aware of Caltech’s high academic standards.

They’ve said it themselves: Caltech is hard.

From the moment you arrive, you’ll dive into the core curriculum, which builds the foundation for every Caltech option (major). To prepare, first-years are expected to demonstrate mastery in several subjects:

• Four years of math, including one year of calculus*
• One year of physics*
• One year of chemistry*
• One year of biology (recommended)
• Four years of English
• Two years of history and/or social sciences (three or more years recommended)

Beyond the subject requirements, Caltech’s grading scale sets strict unit and GPA standards. All undergrads must complete a minimum of 27 units per term with a GPA of at least 1.9 to remain enrolled. First-year students get some leeway here, since the GPA rule doesn’t apply during the first two terms.

By the end of each year, students are expected to complete 108 units in total, averaging 36 units per term. This workload is heavy compared to many other schools, though special waivers may be granted when needed.

To graduate, you’ll also need to complete the required work in your chosen option or major with a passing grade in each subject and maintain a GPA of 1.9 or higher.

Put simply, earning a Caltech degree means completing four years of intense academic work (study abroad included!) that pushes you to explore your interests in a deep and rigorous way.

2. Cultivate good study habits.

Earning good grades at Caltech starts with mastering solid study habits. A heavy workload can quickly pile up if you don’t stay on top of it, so it helps to create a consistent routine. Set aside time each day to review class material. These short daily sessions will reinforce concepts and prevent any knowledge gaps.

How you study matters just as much as when you study. Use active learning techniques to engage with the material instead of just reading it. Summarize notes in your own words, quiz yourself with flashcards, or explain concepts to a peer. These strategies force you to recall information, which strengthens long-term memory.

And remember, your environment can make or break your focus. Choose a quiet, well-lit space and silence distractions like phone notifications so you can give your full attention to studying.

3. Manage stress.

Caltech is known for its rigorous workload, which makes stress management just as important as studying itself. Without enough rest, proper nutrition, and balance in your schedule, it becomes much harder to focus, retain information, and perform well.

Start with the basics. Aim for 8 to 10 hours of sleep each night so your brain can recharge. Pair that with healthy food and regular exercise, which improve focus, stabilize mood, and boost memory.

Schedule regular breaks and activities you enjoy, whether that’s a hobby, time with friends, or short pauses during study sessions. And if stress ever feels overwhelming, don’t wait until it hurts your academics! Reach out to a counselor or mental health professional who can help you manage it before it gets in the way of your success.

4. Maximize campus resources.

If you’re struggling to maintain your GPA under the strict Caltech grading scale, don’t try to power through it alone.

Many students hesitate to ask for help because they’re embarrassed, afraid of looking less capable, or want to stay independent. In reality, reaching out shows maturity and self-awareness.

Use office hours to go over confusing concepts, clarify expectations, or review assignments with your professors. Or, form a study group to make tough material more manageable. Explaining concepts to others helps you learn them more deeply, and hearing different perspectives can unlock new ways of thinking.

Caltech also provides formal academic support. The Undergraduate Deans’ Office and the Center for Teaching, Learning, and Outreach run the Peer Academic Coach (PAC) program, which connects you with students who’ve already succeeded in courses like Core math and science. A PAC can help you break down material, develop study strategies, and stay on track.

Finally, during your first term you’ll be assigned a first-year advisor, a faculty member who guides a small group of students through their initial year. Advisors are a valuable resource for academic planning and perspective when the workload feels overwhelming.

Frequently Asked Questions

1. What is Caltech’s average GPA?

There’s no Caltech average GPA, since the school doesn’t publish this information. However, under the Caltech grading scale, students must maintain at least a 1.9 GPA each term to stay enrolled, and the same 1.9 minimum is required overall to graduate.

2. What is the pass fail policy for Caltech?

Under Caltech’s grading scale, first-year students take all core classes on a pass/fail basis during their first two terms, and these grades don’t count toward GPA. Pass/fail grades are also used in many research and seminar courses, with F* grades showing failed attempts that don’t affect your GPA.

3. What GPA do you need to get into Caltech?

If you’re wondering what GPA you need to get into Caltech, most admitted students report an average around 4.2, boosted by weighted AP or IB courses that go beyond the standard 4.0 scale. Nearly 95% also rank in the top 10% of their class, which means Caltech only admits the cream of the crop.

Takeaways

• The Caltech grading scale uses a 4.3 system, with A+ equaling 4.3 and F equaling 0.0.
• To remain in good standing, you need at least a 1.9 GPA each term, and the same minimum is required overall to graduate.
• Other grade marks such as P, E, I, and F* don’t always factor into your GPA but still appear on your transcript and can affect academic standing.
• Strong grades at Caltech depend on consistent study habits, stress management, and using campus resources like Peer Academic Coaches and faculty office hours.
• If you plan on applying to Caltech, consider working with an admissions expert who can help you strengthen your application and stand out in an ultra-competitive applicant pool.