PhD Admission Guide

Gain Admission To Your Dream School

Guide to PhD Admission

While some students swear off further education after undergrad, some love the thrill of intellectual discovery and research. For these students, graduate school is a natural choice. Graduate degrees are separated into “professional” and “academic” categories. Professional degrees are JDs and MDs, while academic degrees are PhDs (literally “Doctorates of Philosophy” regardless of what field you actually study).

Whether or not you need to pursue a PhD depends entirely on what career you wish to have. Some require higher education, while many others do not. In this guide we’ll go over how to apply to PhD programs, what they are looking for, and how the application process works. This guide is focused on the US and Canada; Europe has a system which is simultaneously similar and very different.

What PhD Programs Look For

PhD programs want to make sure you are prepared academically for the rigors of the program, and that you have a concrete research goal in mind. PhD programs culminate with each student answering a research question they devise, contributing new knowledge to the world in the process. 

Thus these programs seek to evaluate your intellectual ability, research goals, previous research experience, and how you will contribute to their program. To determine this, they ask for the following:

  • GPA
  • GRE
  • CV
  • Essay
  • Letters of Recommendation
  • Interview

We’ll go through each of these in turn, and explain what graduate programs are looking for from each.


Your GPA in undergrad is the single most important factor in PhD admissions. If your GPA is too low your application will be dismissed out of hand. While there are no hard limits, we suggest a minimum GPA of 3.5 for serious contention, especially at top schools. If your GPA is below 3.0 then you will likely not get admitted into any PhD programs.

The reason for this is that PhD programs are a lot of work. Being intelligent is necessary, but is far from sufficient alone. Everyone in PhD programs is intelligent, and everyone is also willing to do the work. Your GPA is seen as the primary indicator of your willingness and ability to do academic work to a high standard, and your preparation for the rigors of a PhD program.

Along with your overall GPA, schools request your major GPA. This is your GPA when calculated only using courses in your major. This is usually expected to be higher than your overall GPA. Your major GPA should be over 3.5.

While taking harder courses in undergrad is a great experience, they can also harm your overall GPA. Of course, the best approach is to take very hard classes and do well in them, but this is not always possible. We recommend taking a blend of courses, so you are never overloaded, and able to give each the attention it needs to do well.

Your GPA and transcript is also used to judge your academic preparation for the program. You should have a solid grounding in the field, and have taken advanced courses as well. Taking graduate level courses in undergrad can exemplify this. 

Some PhD programs also require research languages. This is more common in the social sciences and humanities, but all students will benefit from knowing other languages well enough to do research in them. You should look up language requirements when researching programs to apply to.


The Graduate Record Examinations (GRE) is a standardized test meant for students who intend to apply to graduate programs. Both MA and PhD programs ask for GRE scores. Much like the SAT or ACT in college exams, the test is meant to be a standardized measure of academic preparation and logical skill.

The test consists of six sections. The first is writing, next are two on verbal reasoning, then two on quantitative reasoning, and finally a research or experimental section, meant to test new questions. The entire test is offered on the computer, with one minute breaks after each section, and a ten minute break after the third section. While there is also a paper-based test, almost all testing is now done on a computer. Due to the pandemic, both testing centers and at-home testing are offered. The GRE is a multi-stage test, and how well you do on earlier sections determines the difficulty of later sections and questions. 

The verbal sections each consist of 20 questions, to be answered over 30 minutes. The whole is scored on a scale of 130-170. The quantitative section is scored the same, and consists of two 20 question sections, each of which should be completed in 35 minutes. The writing section is scored from 0-6. For this section, you write an essay on a given issue in 30 minutes, and offer a response critiquing a provided argument for 30 minutes.

Your total score from the GRE is given from 130-170. While the exact scores you need to enter graduate school vary, higher is better. In addition, some programs only care about your verbal score, while others only care about your quantitative score. How much weight each program puts on GRE scores varies greatly.

We recommend studying for the GRE for some time before testing. You can take the GRE up to five times per year, but must wait at least 21 days between testing dates. Only scores from the past 5 years will be released or considered by graduate programs.

This is akin to a resume, but is dissimilar enough that the two cannot be used interchangeably. The purpose of a CV is, like a resume, to detail what you have accomplished academically and in your career. It is far more focused on academics however, and is widely used for academic careers.

We recommend finding a template for a CV online, or asking your college’s advisors for help in creating one. If you already have a resume, then you will easily be able to convert it into a CV.

What admissions officers are looking for in your activities is primarily signs of research. This should be in whatever field you intend to pursue a PhD in. Publications are also incredibly valuable. All of academia runs on publication, and getting an early start helps your career at every step.

You should try to do research while still in undergrad. What this looks like depends entirely on what field you are pursuing. While the research does not have to exactly line up with what you wish to pursue, it should teach you skills which are cross applicable. Higher level academic research has its own set of methods and language which must be learned, and students who are already familiar with the forms and structures of research have a leg up in graduate school. 

Publication is not required, but is nice to see. If you have completed a master’s degree, you should have some publication history; of your thesis if nothing else. Speak with your academic advisors about getting your work published.

Each graduate school you apply to will ask for an essay. You will be able to use the same basic form for each, but will need to edit it to be about the particular program you are applying to. Most schools only require a single essay, although some programs ask for a second on diversity.

The purpose of this essay is to explain your research interests, what you have studied, your intended area of specialization, and what your focus will be on. Every PhD student is asking and trying to answer a very specific research question. This question forms the basis of their dissertation, and will be the focus of your life for several years if you are accepted.

Thus the essay is the most important part of your application. Your grades and GRE are required to see if you are academically ready for graduate school, but the essay lets readers know if you are a match for their program, and serious about your research.

Your essay should begin by stating which program you are applying to, and why. Next, go through your previous academic experience in the field, both coursework and research. You don’t have to go through every class, but cover the ones most relevant to your desired research topic.

You should discuss any prior research you have done in the field. If you completed a thesis for your undergraduate degree or a master’s program, cover that here. If you have any publication credits, cover those as well. This should relate directly to the field you are trying to enter. If you wish to pursue lab work, discuss your previous experiences; if instead you are pursuing field work, talk about your experiences there.

Next you should talk about the research you specifically wish to pursue through a PhD. You don’t need to have an exact research question worked out, but it is helpful to have some idea; you should at least know the subfield you will be focusing on. The more specific you are, the better. Having some discussion of methodology can be nice, but is not always necessary.

If there are any ongoing research projects ongoing at the school you wish to work on, cover those next. You should discuss how these projects specifically relate to your own research interests. Finally, you should talk about which professors you wish to work with. Professors take on graduate students to advise, and you ideally want one with a specialization at least tangentially related to your field of interest. The more closely related the professor’s studies are to your own, the better.

You will be able to leave much of this essay the same for each school you apply to, changing only the name of the program, the research projects, and the professors you wish to work with. 

This essay should be a page and a half to two pages long, single spaced. You should go into sufficient detail for those reading it to understand the research you want to pursue. These essays are reviewed by the faculty who run the department, and they make the admissions decisions for PhD programs. There are many more applicants than there are spaces, and admissions rates are low. The more specific and detailed you are in this essay, the better the faculty will understand your research aims, and the better your chances will be.

Not all programs ask for these, but you will likely be able to reuse the same essay for those that do. The purpose of the diversity statement is to see what unique points of view and experiences you will be able to contribute to the program. PhDs are about learning, and the more viewpoints and ideas within a program, the broader the experience will be.

If you are a member of an underrepresented group, an immigrant, come from an underprivileged background, or come from an area which is generally underrepresented, we suggest discussing that in this essay. You should not write an essay about your interactions with members of these groups, or a study abroad experience.

Above all, this essay should be authentic to you and your experience. The goal is to show how your background has shaped you as a person, and how it impacts your view of the world.

As with college applications, letters of recommendation are required for PhD admissions. These tell admissions committees who you are as a student and researcher, and give their opinion on how you will perform when doing graduate level work. Academic fields are small and often insular, and the professors writing your letters will often be known by those reading them, either by reputation or in person.

Programs ask for two to four letters. These should primarily come from professors who know you and your work well. If you had a thesis advisor, they should write one of your letters. If you’ve worked doing research for some time, then a mentor or lab director can also be a good source of a letter, even if they haven’t taught you in class. Letters should not come from non-academic sources, unless you have worked professionally in that field. 

While you have the option to read the letters that are written for you, you should always waive that right. If you don’t trust your writers to craft good letters for you, then you shouldn’t be asking them for letters. Asking to see letters is considered a sign of lack of trust, and is gauche. Many professors will decline to write letters if you insist on seeing them.

You should ask for letters well in advance of when they are due; we recommend at least a month or two. If you are asking non-tenured faculty for a letter, more leeway is recommended, as they have more on their plate, and are often more stressed. You may need to send a reminder as deadlines approach. You should also share a copy of your essay with letter writers, so they know exactly what subfield you intend to pursue, and can discuss this in their letters.

Finally, you should be aware of politics when asking for letters. Some professors do not like each other at all. If you are seen as the protege of a professor who others detest, this can impact your admissions chances. Always discuss which schools and programs you are applying to with your letter writers. You should also discuss your choices of writers with an advisor (for example a thesis advisor) familiar with the field. Academic politics are incredibly petty, but if you plan to pursue a PhD you need to be aware of the game, and how it is played.

If your application passes the first review, you will be invited to do an interview. This will be with faculty in the program you are applying to. This is to further get to know you, and to understand your research objectives. 

You should be able to clearly explain what you want to research, and how this program will help you do so. The people talking to you will all be familiar with the field, though not necessarily your specific subfield. They are looking for your ability to communicate and explain your view. Be prepared to answer some questions about the specifics of your goals, though it’s ok if you don’t know everything right now.

Interviews are generally in person, though due to the pandemic, virtual interviews have become more common. This is also your chance to ask any questions you have about the program you were unable to find answers to online. You can practice for this interview with an advisor or mentor; many schools have career centers which hold mock grad school interviews as well.

When and How to Apply to Grad School

There is no unified platform for PhD applications. Instead you must apply to each program individually, through the school’s website. This will mean filling out information multiple times, but they fortunately don’t ask for much. Once you have your documents in order, the rest is personal, demographic, and contact information.

You will need to pay to have your GRE scores sent to each school you apply to. Even though this is all electronic, they still charge dearly for it. 

Applications are generally due in December or January, with interviews held over the next few months. Applications open in September or October. We recommend getting your applications in before the due date, though most programs don’t use rolling admissions. Each program sets their own deadlines, so you should track when each of your applications is due carefully to make sure nothing gets overlooked.

Paying for Grad School

PhD programs are for the most part fully funded. This means you will not be paying tuition, and will also get funding to live on. This funding is generally contingent on academic standing, and doing work TAing, teaching, or on ongoing research projects (or most commonly, all of the above). Many grad students also work full or part time to support themselves. 

While you will not need to take on additional debt to pay for graduate school, you will not be well paid either. While the exact amount graduate students receive varies by school and program, it is generally in the range of $20-30,000 annually. This goes towards food, housing, and supplies.

While you are in a PhD program, you will not have to make payments on any government loans you took out to pay for undergrad, though they will continue to accrue interest. Making payments on them during grad school is difficult, but will greatly cut down on the amount you need to pay back later.

There are also outside scholarships available to help pay for graduate studies. While the amounts offered by these vary, most are small. They can help greatly with paying for the necessities however, and applying to them is usually worth the time investment.

Grad School Admission FAQ

Now we’ll answer some of the most common questions about applying to PhD programs.

Can older students apply?

Yes. Many professionals return to school for a PhD long out of undergrad. We suggest taking some courses at a local university in the field you plan on entering before you do this however. Academic research advances quickly, and this will familiarize you with the latest developments. Further, this will introduce you to professors who can provide you with letters of recommendation.

What are my odds of acceptance?

This depends on both your field and program. Generally, however, it is quite difficult to gain admissions to a PhD program, and admission rates hover around 10%. Only the best students get accepted, and this is even more the case at the top schools and programs.

When should I start thinking about applications?

When you choose your major, you should decide what level you want to reach within that field. Some majors lend themselves to PhDs if you want to work in that field, while others allow employment at various levels.

Where should I apply?

You should find programs with professors who are dedicated to your particular subfield. A prestigious institution which does not focus on your area is far less useful, regardless of how famous its name is. You are looking for someone who will be able to advise you, and help you perform worthwhile research. Further, professors are looking for students studying fields similar to their own when they admit graduate students.

How long are PhD programs?

Generally programs last 4-5 years, though this can vary based on field. The exact structure of the programs also varies a lot based on field and program.

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