The Duolingo English Test and the IELTS exam are two of the most widely recognized English language proficiency assessments accepted by universities, immigration authorities, and professional organizations around the world. While both tests measure English ability, they differ significantly in format, delivery, cost, scoring methodology, and the contexts in which they are most commonly accepted. Knowing the fundamental differences between these two exams is the first step toward making an informed decision about which one suits your specific goals and how scores from one relate to scores from the other.
IELTS, which stands for International English Language Testing System, has been in operation since 1989 and is jointly owned by the British Council, IDP: IELTS Australia, and Cambridge Assessment English. It is taken in person at authorized testing centers around the world and assesses four distinct language skills: listening, reading, writing, and speaking. The Duolingo English Test, launched commercially in 2016, is an entirely online assessment taken at home using a webcam and internet connection. Its lower cost and flexible scheduling have made it increasingly popular among international students and applicants who prefer a more accessible testing experience.
How Scoring Systems Differ
IELTS uses a nine-band scoring scale where each band corresponds to a specific level of English competence, ranging from Band 1, which represents non-user ability, all the way to Band 9, which indicates expert-level English proficiency. Scores are reported as an overall band score along with individual scores for each of the four tested skills. Most universities and immigration programs set their minimum requirements somewhere between Band 5.5 and Band 7.5, depending on the level of study and the nature of the program in question.
The Duolingo English Test uses a different scale entirely, reporting scores between 10 and 160 in increments of five points. It also provides four subscores covering literacy, comprehension, conversation, and production, giving institutions additional detail about a test-taker’s specific strengths and weaknesses. Because the two scales are constructed differently and measure slightly different combinations of skills, there is no perfectly precise mathematical conversion between them. However, Duolingo publishes an official comparison chart that provides a general guide for how scores on its test align with equivalent IELTS bands, and most institutions that accept both tests refer to this chart when evaluating applicants.
Official Score Comparison Chart
Duolingo has published an official score comparison table that maps its score ranges to approximate equivalent scores on other major English proficiency tests including IELTS, TOEFL, and the Cambridge suite of exams. According to this comparison, a Duolingo score of 90 corresponds roughly to an IELTS Band 5.5, a score of 100 aligns with approximately Band 6.0, a score of 110 corresponds to around Band 6.5, and a score of 120 maps to roughly Band 7.0. Scores of 130 and above on the Duolingo scale are generally considered equivalent to IELTS Band 7.5 or higher.
It is important to treat these conversions as approximations rather than exact equivalencies, because the two tests assess English ability through fundamentally different task types and testing conditions. A student who scores 110 on the Duolingo English Test may not perform identically to a student scoring Band 6.5 on IELTS, since the skills that each test rewards most heavily are not perfectly aligned. Institutions that accept both tests are generally aware of this limitation and evaluate scores in the context of a complete application rather than treating converted scores as interchangeable proof of the same level of English ability.
Validity Periods for Scores
Score validity is a practical consideration that affects when you need to take your test and how far in advance you can begin your application process. IELTS scores are valid for two years from the date of the test, after which most institutions will no longer accept them as evidence of current English proficiency. This two-year window is based on the assumption that language ability can change meaningfully over time, and that a score obtained more than two years ago may no longer accurately reflect a person’s current level of English communication skills.
Duolingo English Test scores are also valid for two years from the test date, placing them on equal footing with IELTS in terms of the period during which they can be used for application purposes. Both tests align on this standard because most major institutions set their own validity requirements around the two-year mark and would not accept scores older than this regardless of which test was taken. If you are planning well in advance of your intended start date, make sure to schedule your test so that your scores will still be within their validity window when the institution processes your application, since expired scores cannot typically be extended or renewed.
Institutional Acceptance Rates
IELTS has one of the broadest acceptance profiles of any English language test in the world and is recognized by over 11,000 organizations globally including universities, colleges, employers, professional licensing bodies, and immigration authorities in countries such as the United Kingdom, Australia, Canada, New Zealand, and many others. Its long history and widespread recognition make it the safest choice for applicants targeting institutions or countries where the test acceptance landscape is unclear or where specific requirements have not been recently verified.
Duolingo English Test acceptance changes as institutions update their policies. An admission applicant should verify that the exact program, country and intake accepts DET; being accepted at one university does not establish acceptance for licensing, immigration or all of its faculties.
IELTS is available in two formats: Academic and General Training. The Academic version is intended for students applying to undergraduate or postgraduate programs at universities and for professionals seeking registration in fields like medicine and nursing. The General Training version is designed for those applying for secondary education, work experience programs, or immigration to English-speaking countries. Both formats include listening, reading, writing, and speaking sections, but the content and complexity of the reading and writing tasks differ significantly between the two versions.
The Duolingo English Test does not offer different versions for different purposes. It consists of a single adaptive test format that adjusts question difficulty in real time based on the test-taker’s responses, similar to how some standardized testing platforms operate. The test includes reading, writing, listening, and speaking tasks presented in an integrated format rather than discrete sections, and the entire exam takes approximately one hour to complete. This shorter duration and single unified format make it more convenient for many applicants, though some institutions specifically require IELTS Academic and will not accept the Duolingo test as a substitute regardless of the score presented.
Costs and Accessibility Compared
Cost is one of the most significant practical differences between the two exams and a factor that influences many test-takers’ decisions. IELTS test fees vary by country but typically range from approximately $200 to $300 USD depending on the testing location and local pricing conditions. In addition to the registration fee, test-takers may incur travel costs to reach an authorized testing center, accommodation costs if the nearest center is far from their home, and preparation course fees if they choose to take formal coaching before their exam date.
Language-test prices and score-delivery policies vary by market and change over time. Compare the official current Duolingo English Test and IELTS booking information, including reschedule charges, retake restrictions and which scores a target institution accepts, before choosing a test.
Preparation Strategies for Both
Preparing for the IELTS exam requires a structured approach that addresses all four tested skills systematically over a period of several weeks or months, depending on your current proficiency level and target score. Official preparation materials published by Cambridge, the British Council, and IDP include practice tests that replicate the exact format and difficulty of the real exam and are invaluable for familiarizing yourself with the question types you will encounter. Specific preparation for the writing section is particularly important because many test-takers find that their writing band score pulls their overall result down even when their other skills are strong.
Preparing for the Duolingo English Test requires a different approach because the adaptive format means you cannot predict the exact sequence or difficulty of questions in advance. The best preparation strategy focuses on building broad English proficiency across reading, writing, listening, and speaking rather than memorizing specific question formats. Duolingo provides free official practice tests through its website that allow you to experience the real test interface before your exam date. Regular practice with the platform, combined with general English language exposure through reading, listening to podcasts, and engaging in spoken English conversations, tends to produce stronger Duolingo scores than narrow test-specific preparation alone.
Which Test Suits You
Choosing between the Duolingo English Test and IELTS depends on several personal factors that vary from one applicant to the next. If your target institutions all appear on Duolingo’s acceptance list and cost or convenience is a significant concern, the Duolingo test is a practical and legitimate choice that will meet your requirements at a fraction of the cost of IELTS. Many highly competitive universities in the United States and Canada now fully accept Duolingo scores for undergraduate and graduate admissions, and the two-day score turnaround makes it ideal for applicants working within tight application deadlines.
If you are applying for immigration purposes, targeting institutions in countries with conservative test acceptance policies, or applying to professional licensing bodies in fields like medicine, law, or engineering, IELTS remains the safer and more universally accepted option. Some countries’ immigration programs specifically list IELTS as an approved test while not yet including the Duolingo English Test in their accepted credentials. Checking the current requirements of every organization on your application list before registering for either test saves time and prevents the frustration of submitting scores that a key institution will not accept.
Flexibility in retaking and rescheduling your test is another area where the two exams differ meaningfully. IELTS can be taken as often as you wish but requires registering and paying the full fee for each attempt. Most testing centers offer test dates several times per month, though popular dates fill quickly in high-demand locations, meaning you may need to plan several weeks in advance to secure a spot at a time that works with your schedule. The waiting period between results and the availability of a new test date can stretch your overall timeline significantly if your first score does not meet your target.
The Duolingo English Test allows test-takers to retake the exam no more than twice per thirty-day period, which is a limitation designed to prevent gaming of the adaptive scoring system through rapid repeated attempts. However, because the test is available on demand every day including weekends and holidays, scheduling a retake is far more flexible than with IELTS. New scores are delivered within two days, so the turnaround between an unsatisfactory result and the receipt of an improved score from a retake can be completed in as little as a week, which is significantly faster than the typical IELTS cycle of test scheduling, sitting, and waiting for official results.
Score Sending Procedures
Once you have your scores in hand, the process for sending them to institutions differs between the two tests. IELTS provides a Test Report Form to the test-taker on the day results are released and also allows for official electronic score reports to be sent directly to institutions. Depending on when and where you took the test, additional score report copies may be available free or for a small administrative fee. The process for requesting official score delivery varies slightly between the British Council and IDP, so checking the procedure for your specific testing provider is advisable before your test date.
Duolingo sends scores directly to the institutions you designate through an entirely digital process integrated into the Duolingo English Test platform. You select the institutions you want to receive your scores during or after your test session and the reports are delivered electronically, typically within two days of your results being released. You can send scores to unlimited institutions, which is a notable advantage over IELTS where additional score reports beyond the initial allocation carry fees. This digital-first approach aligns well with the overall convenience orientation of the Duolingo test and reduces administrative friction for both applicants and receiving institutions.
Common Conversion Mistakes
Many applicants make the mistake of assuming that converted scores are accepted interchangeably by all institutions, which can lead to serious problems in the application process. An institution that requires a minimum IELTS Band 6.5 does not automatically accept a Duolingo score of 110 as equivalent, even though that is the approximate conversion suggested by Duolingo’s own comparison chart. Some institutions have independently set their own minimum Duolingo score thresholds that do not align precisely with the general conversion guide, and these institution-specific requirements take precedence over any generalized comparison table.
Another common error is applying score conversions to immigration requirements without verifying current government policy. Immigration authorities in countries like Canada, the United Kingdom, and Australia set their own specific test and score requirements and these can change with relatively little public notice. A conversion that appeared valid when you began your research may no longer reflect current official policy by the time you submit your application. Always consult the official government immigration website or an authorized immigration advisor to confirm the current English test requirements before making any decisions based on conversion charts or secondary sources.
University Requirements Vary Widely
Different universities and different programs within the same university can have significantly different English proficiency requirements, and this variation applies to both IELTS and Duolingo score thresholds. A general undergraduate admissions office may accept a lower overall score than a competitive graduate program within the same institution, and departments focused on intensive communication work such as journalism, law, or social work may set higher minimum scores than programs in technical fields. Checking requirements at the department or program level rather than only at the institutional level prevents unpleasant surprises late in the application process.
Some institutions also specify minimum subscores in addition to overall score minimums, which adds another layer of complexity to the score comparison process. An IELTS requirement might specify a minimum Band 6.0 in writing even if the overall requirement is only Band 6.5, and a Duolingo requirement might include a minimum production subscore alongside the overall score threshold. Because IELTS subscores and Duolingo subscores measure related but not identical constructs, there is no reliable way to convert subscore requirements between the two tests. The safest approach is to contact admissions offices directly when subscore requirements are not clearly stated on an institution’s official website.
