Admissions·United States· 10 min read

How to Get Into the University of Illinois Urbana-Champaign (UIUC)

A focused guide to UIUC admission: applying directly to a major and college, why Grainger Engineering (especially Computer Science) is far more selective, first-choice-only majors, and second-choice strategy.

Last updated 7 July 2026

Key facts

Application systems: myIllini or Common App (no preference)
Admission basis: Direct to a major within a specific college
Selectivity note: Admit rates vary by major; Grainger CS is among the most competitive
First-choice-only (first-year): Recently CS/CS+X, Computer Engineering, Mechanical Engineering — verify current list
Verify at: UIUC Admissions (admissions.illinois.edu) and Grainger Engineering

The one thing to understand about UIUC admission

The University of Illinois Urbana-Champaign (UIUC) is a large public research university and a major target for students aiming at computer science and engineering. The single most important thing to understand is that you apply directly to a major within a specific college, and your odds depend heavily on which major you choose.

At UIUC, admission is not just "get into the university." Admit rates vary by major, and a program like Computer Science in The Grainger College of Engineering is among the most competitive in the country. Two applicants with similar records can get different outcomes purely because of the major they applied to.

You can apply through myIllini (UIUC's own application) or the Common App, and the university states no preference between them. Confirm current requirements on UIUC's official admissions website, since major-level rules change.

You apply to a specific major within a specific college
Admit rates vary by major; selective majors (e.g., Grainger CS) are much harder
Apply via myIllini or the Common App — no preference

Why major choice drives your odds

Because UIUC admits by major, the competitiveness of your chosen program is a core variable. Within Grainger, Computer Science and other high-demand majors (such as Aerospace and Computer Engineering) carry lower acceptance rates than less-subscribed programs.

This means your first strategic decision is honest self-placement. If your record strongly supports a highly selective major, apply to it — but understand the bar. If it is a stretch, consider whether a related but less oversubscribed major is a better primary choice, since being admitted to UIUC in an adjacent field can beat a low-probability shot at the most competitive one.

UIUC recommends strong STEM preparation for engineering applicants: calculus is preferred and physics is expected where offered, with advanced (honors/AP) STEM coursework where available. Match your intended major to a record that genuinely supports it.

Within Grainger, CS and other high-demand majors have lower acceptance rates
Choose a primary major your record honestly supports
Engineering applicants: calculus preferred and physics expected, plus strong science coursework

First-choice-only majors and the undeclared trap

UIUC lets many applicants list a first-choice and a second-choice major, but some programs are first-choice-only. For first-year applicants, Grainger's Computer Science (including CS+X blended degrees), Computer Engineering, and Mechanical Engineering are described as first-choice-only — you must rank them as your primary selection to be considered.

There is also a critical restriction to know: you cannot declare Computer Science, CS+Bioengineering, or CS+Physics if you begin as an Engineering Undeclared student. In other words, you cannot enter undeclared and then switch into CS. If CS is your goal, you must apply directly to it.

This is exactly where applicants go wrong. Read the current first-choice-only list and undeclared restrictions on the official Grainger admissions pages before you lock in your choices.

Some Grainger majors (CS/CS+X, Computer Engineering, Mechanical Engineering) are first-choice-only for first-year applicants
You cannot switch into CS/CS+X after starting as Engineering Undeclared
If CS is your goal, apply directly to CS — verify the current rules on the official site

Using your second-choice major well

When a major lets you add a second choice, use it deliberately. UIUC recommends selecting a second choice closely related to your first, though you may pick an unrelated major if you have genuine interest. Listing a strong, plausible second choice can improve your overall chance of being admitted to UIUC.

Within Grainger, signaling commitment to engineering matters: choosing two engineering majors tells the admissions team you are serious about engineering, and they will look to admit you into one of them where possible. But your writing must reflect real interest in each — UIUC explicitly warns that your response to the second-choice writing prompt should not be identical to your first-choice response.

So treat the second choice as a real decision, not a throwaway. Pick something you would genuinely attend, and write about it distinctly.

A strong, related second choice can improve your odds
Two engineering choices signal commitment to Grainger
Write distinct essays for each major — do not copy your first-choice response

Essays, testing, and what UIUC reviews

UIUC's application includes short-answer prompts (recently two to three, around 150 words each) plus an essay, with the exact prompts depending on whether you apply to a declared major or an undeclared program and which application system you use. These short answers are where you make the case for your specific major.

Admission review considers your academic record and rigor, your fit and preparation for the chosen major, and your writing. Because testing policies at U.S. universities change frequently, verify UIUC's current SAT/ACT requirement on the official admissions page rather than assuming.

Applying early can matter for the most competitive majors. Plan your testing and writing so a complete, strong application is ready in time, and verify the current deadlines on the official site.

Short-answer prompts (recently ~2–3, ~150 words) plus an essay, tailored to your major
Review weighs record, rigor, and fit for the chosen major
Verify testing policy and deadlines on the official site; apply early for selective majors

Your UIUC application plan

Begin by choosing your primary major honestly and checking whether it is first-choice-only or has undeclared restrictions — this is decisive for CS and other Grainger programs. Then pick a genuine, well-matched second choice where allowed.

Build the rest of your file to support that major: rigorous STEM coursework for engineering, distinct short-answer responses for each major, and any test scores the current policy calls for. Aim to submit ahead of the deadline for competitive programs.

International applicants should additionally complete English-proficiency requirements and any credential documentation UIUC requires. Confirm the current major lists, deadlines, essay prompts, and testing policy on UIUC's official admissions and Grainger pages before you apply.

Pick your primary major honestly; check first-choice-only and undeclared rules
Choose a real second choice and write distinct essays
Submit early for selective majors; international applicants add English-proficiency steps

Frequently asked questions

Do you apply to a specific major at UIUC?

Yes. At UIUC you apply directly to a major within a specific college, and admission decisions are made at that level. This is why a program like Grainger Computer Science can be among the most competitive options while admit rates vary widely by major. You can apply through myIllini or the Common App. Confirm current major-level rules on UIUC's official admissions site.

Can I start undeclared and switch into Computer Science at UIUC?

No. UIUC states you cannot declare Computer Science, CS+Bioengineering, or CS+Physics if you begin as an Engineering Undeclared student. If CS is your goal, you must apply directly to it as a first-year applicant. Verify the current undeclared restrictions on the official Grainger admissions pages.

What are first-choice-only majors at Grainger Engineering?

For first-year applicants, Grainger lists certain programs — recently Computer Science (including CS+X), Computer Engineering, and Mechanical Engineering — as first-choice-only, meaning you must rank them as your primary selection to be considered. Because these lists can change, check the current first-choice-only majors on the official Grainger admissions page.

How should I choose my second-choice major?

UIUC recommends a second choice closely related to your first, though an unrelated major is allowed if you genuinely want it. A strong second choice can improve your overall odds, and two engineering choices signal commitment to Grainger. Importantly, write a distinct response for each major — UIUC warns against identical essays for your first and second choices.

Does UIUC require the SAT or ACT?

Standardized-testing policies at U.S. universities change frequently, so UIUC's current SAT/ACT requirement should be confirmed directly on its official admissions page rather than assumed. Whatever the policy, applying early is advised for the most competitive majors, so plan any testing so your application is complete in time.

Official sources

This guide explains the process and is for guidance only. Eligibility, dates, fees and rules change every year — always confirm the current details on the official site before you act.

Verified against: UIUC Grainger — Choosing a Major; UIUC Grainger — First-Year Admissions; UIUC Grainger — Admissions FAQ; UIUC Grainger — Undergraduate Admissions.

Last verified: 7 July 2026.