ATAR to IB Converter 2025/2026: full guide for students, parents, counsellors and university applicants

The ATAR to IB Converter on this page is designed to answer one practical question: “What IB Diploma score, IB Admissions Score, or IB score range is roughly equivalent to my target ATAR?” In Australia, this question is more complicated than a simple percentage conversion because the ATAR is not a mark, and the IB Diploma is not built as a percentile rank. The ATAR is a ranking number used for tertiary selection. The IB Diploma is a points-based qualification with subject grades, core points, diploma conditions and school-based requirements. A fair converter must therefore distinguish between an Australian IB Admissions Score, usually called IBAS, and a whole-number IB Diploma score used for many students who completed the IB outside Australia.

For the 2025/26 selection cycle, Australian tertiary admissions centres use a published IBAS-to-ATAR-equivalent table. In New South Wales and the Australian Capital Territory, UAC calls the result a Combined Rank. In Victoria, VTAC calls the result a Notional ATAR. In practical university-selection language, both are ATAR-like values used to compare IB students with students who completed Australian Year 12 qualifications. This page lets you convert in both directions, estimate the minimum IBAS needed for a target ATAR, compare a whole IB score with a notional ATAR, and calculate a predicted IB Diploma total from six subject grades plus Theory of Knowledge and Extended Essay core points.

Important limitation: no website can calculate your official IBAS

The official IBAS is calculated using detailed performance information that is not available to the public through a normal calculator. Since November 2022, Australian IB students do not rely only on the whole number out of 45. Admissions centres can receive finer information about where the student sat inside each subject grade band, then use that data to create a decimal score in intervals of 0.25. For example, a student with a diploma score of 41 could receive an IBAS such as 41.00, 41.25, 41.50 or 41.75. These decimals can change the resulting ATAR-like rank. Because this website cannot access your private subject boundary data, it cannot reproduce the official admissions-centre calculation. Instead, it uses the current published conversion table and clearly labels the output as an estimate.

What is an ATAR?

ATAR means Australian Tertiary Admission Rank. It is presented from 0.00 to 99.95 and is used by universities to compare applicants who have completed different senior secondary subjects and qualifications. The most important idea is that an ATAR is a rank, not a raw percentage mark. An ATAR of 80.00 does not mean the student scored 80 percent in every subject. It means the student is placed around the top 20 percent of the relevant age cohort under that admissions system. Universities then use the ATAR, or an ATAR-like rank, as one selection tool. Many courses also use selection-rank adjustments, prerequisites, interviews, auditions, portfolios, admission tests, equity schemes, subject requirements or additional selection criteria.

This distinction matters because a student cannot accurately convert a school mark, a subject grade or a simple percentage into ATAR. A high IB grade in one subject is not automatically an ATAR. Likewise, a high ATAR does not tell a student which IB subjects were taken. Conversion tables exist only because admissions centres need a common scale for comparing different qualifications during university selection. The converter therefore focuses on admission equivalence, not curriculum equivalence.

What is the IB Diploma score?

The International Baccalaureate Diploma Programme is normally studied across two years. Full Diploma students study six subjects, usually across the six DP subject groups: studies in language and literature, language acquisition, individuals and societies, sciences, mathematics and the arts. Students may replace the arts group with an additional subject from another permitted group. Subjects are taken at Higher Level or Standard Level. Higher Level subjects involve greater depth, breadth and teaching time, but both HL and SL courses are graded on the same 1 to 7 scale.

The basic IB Diploma points formula is straightforward. Each of the six subjects contributes a grade from 1 to 7, so the maximum subject total is 42 points. Theory of Knowledge and the Extended Essay can contribute up to 3 additional core points. Creativity, Activity, Service is required for the award of the diploma but does not add numerical points. The maximum IB Diploma score is therefore 45 points.

To be awarded the full diploma, a student generally needs at least 24 points and must satisfy several additional requirements. These include meeting CAS requirements, receiving grades in all subjects and core components, avoiding certain failing conditions, having sufficient points across HL and SL subjects, and not having excessive low grades. This is why a calculator that only adds six grades can be misleading. A student with 24 or more points can still fail the diploma if a failing condition applies. The IB status checker in this tool includes the main published diploma conditions so students can see why the points total is not the entire story.

What is IBAS?

IBAS means IB Admissions Score. It is the fine-grained score used for Australian IB students in the current conversion system. Whole IB points remain important, but they do not always show the full distribution of performance. Two students may both receive a 39, but one student may have been near the lower boundary of several grade bands while another was close to the upper boundary. IBAS tries to reflect that additional information in a controlled admissions score. It adds decimal values in 0.25 steps, so a student might receive 39.00, 39.25, 39.50 or 39.75. The current national conversion table then maps the IBAS to a Combined Rank or Notional ATAR.

Why ATAR to IB conversion is not linear

A common mistake is to treat ATAR and IB as two normal test scores and divide one by the other. That does not work. An ATAR of 99.00 is not “99 percent”, and an IB score of 43 is not “43 out of 100”. The two scales measure different things. The IB score reflects subject and core achievement; the ATAR reflects relative senior-secondary ranking. Therefore, the conversion curve is not linear. Moving from IBAS 24.00 to 25.00 covers a different ATAR movement than moving from 44.00 to 45.00. Near the top of the scale, tiny changes in IBAS can matter because the table distinguishes very high ranks in narrow bands. In the middle of the scale, larger practical differences may be compressed differently.

For example, using the 2025/26 Australian IBAS table, an IBAS of 45.50 and 45.75 both map to 99.95. An IBAS of 45.00 maps to 99.85. An IBAS of 43.00 maps to 98.90, while 43.25 maps to 99.10. That means a student targeting an ATAR-equivalent of at least 99.00 would need 43.25 under the minimum-meeting-target rule, not merely 43.00. At lower bands, 30.25 maps to 80.40 while 30.00 maps to 79.90, so a target of 80.00 would require 30.25. The table method is therefore more accurate than a straight-line equation.

How to use this converter properly

Start by choosing your conversion mode. Use Australian IBAS mode if the student is completing the IB in Australia under the post-November-2022 system and wants an ATAR-like admissions comparison. Use whole IB score mode if the student completed the IB outside Australia and the admissions centre will use the whole score out of 45. Then enter the target ATAR. The converter will show the minimum IBAS or whole IB score that reaches the target, the nearest published conversion, the value immediately below the target if available, and a short interpretation.

For students planning results, the IB points calculator is often more useful than the converter alone. Enter six subject grades, mark each subject as HL or SL, choose TOK and EE grades, and confirm CAS completion. The calculator will add the subject total, calculate core points, check major diploma conditions and show the approximate ATAR-equivalent band. This is not a replacement for school advice, but it helps students see the scale of the goal. If your target ATAR requires around 38.75 IBAS, a predicted score of 35 means you likely need several subject-grade improvements, stronger TOK/EE outcomes, or both.

Australian IBAS mode versus whole IB score mode

The converter includes two conversion tables because students are assessed differently depending on where and when they completed the IB. For Australian IB students sitting from November 2022 onward, the fine-grained IBAS system is used. For many students who completed the IB outside Australia after November 2022, the admissions rank is based on the whole number reported on the official IB transcript. This matters because a whole score of 39 maps to 95.75 in the outside-Australia table, while an Australian student with an IBAS inside the 39 band could appear as 39.00, 39.25, 39.50 or 39.75 with ranks from 95.25 to 96.00. In other words, the whole-score table is simpler, while the Australian IBAS table spreads students more finely inside each IB score band.

When comparing offers, always read the university’s admission wording carefully. Some universities mention ATAR, some mention selection rank, some publish IB equivalent tables, and some courses use additional criteria. A selection rank may be higher than the ATAR or Combined Rank because it can include adjustment factors such as subject adjustments, equity adjustments or location-based schemes. A course with a listed selection rank of 95.00 does not always mean every successful student had an unadjusted ATAR of 95.00. This is especially relevant for students comparing IB conversion values with published course pages.

Score guidelines for common ATAR targets

As a quick guide, a target ATAR-equivalent of 99.95 sits at the very top of the published scale and corresponds to 45.50–45.75 in Australian IBAS mode or 45 in whole IB score mode. A target around 95.00 corresponds to approximately 38.75 IBAS, while whole IB score mode uses 39 as the nearest published score above that threshold. A target around 90.00 corresponds to approximately 35.25 IBAS, with 35 as the whole-score benchmark. A target around 80.00 corresponds to approximately 30.25 IBAS, with 30 as the whole-score benchmark. These are not personal guarantees. They are table lookups based on the published 2025/26 conversion schedule.

Students should also remember that an IB Diploma score is built gradually. Raising a result from 34 to 38 is not just “four points”; it might require one or more subject grades to move up, a stronger TOK essay or exhibition result, a better Extended Essay grade, stronger internal assessment marks, and improved final exam performance. The strongest planning strategy is to identify the highest-yield changes. For example, moving a subject from a 5 to a 6 adds one full IB point. Improving TOK/EE from a low core combination to a stronger one can add one or two points. However, students should not gamble the entire goal on the core because core points are capped at three.

IB course structure students should understand before converting scores

The IB Diploma is intentionally broad. A typical full Diploma student studies language and literature, a second language, a humanities or social science subject, a science, mathematics, and either an arts subject or a permitted alternative. Three or four subjects are normally taken at Higher Level, and the remaining subjects are taken at Standard Level. Higher Level courses require deeper engagement and are particularly important for some university prerequisites. For example, engineering, medicine, computer science, economics or mathematics-related degrees may specify particular mathematics or science subjects at a required level and minimum grade.

The DP core is also important. Theory of Knowledge asks students to think critically about knowledge, evidence, interpretation and the way disciplines construct claims. The Extended Essay is an independent research essay that develops academic writing and inquiry skills. Creativity, Activity, Service requires sustained participation and reflection beyond formal classroom assessment. Although CAS does not add numerical points, it is a requirement for the diploma. A student who treats CAS as “not counted” can create unnecessary risk. For university planning, students should build a calendar that includes final exams, internal assessment deadlines, TOK deadlines, Extended Essay milestones and application deadlines.

Next IB exam timetable snapshot for 2026

The official IB exam schedule page lists the Diploma Programme and Career-related Programme schedules for upcoming sessions. The May 2026 session is published as a final timetable for all exam zones A, B and C. The May 2026 examination schedule begins on Friday 24 April 2026 and runs to Wednesday 20 May 2026. The IB timetable notes that public, national and school holidays cannot generally all be considered because the programme is offered across many countries, although the May 2026 schedule notes no exams on 1 May. Students must check their own subjects, time zone and school instructions with their programme coordinator.

The November 2026 session is also published as a final timetable for all exam zones A, B and C. It begins on Friday 23 October 2026 and ends on Friday 13 November 2026. For students in the southern hemisphere, this November window is often the key examination session. The exact personal timetable depends on selected subjects, HL/SL levels, exam zone, school start times and whether any local arrangements apply. Students in regions affected by disruption should rely on direct instructions from their school and official IB communications because exceptional arrangements can vary by country, authority and school.

How to build a realistic ATAR-to-IB study goal

Step one is to define the target correctly. Do not only write “I need 95.” Decide whether the university lists an ATAR, a selection rank, an IB score, a Combined Rank, a Notional ATAR or a course-specific prerequisite. Step two is to identify the conversion mode. Australian IB students should think in terms of IBAS and possible ATAR-like range; international IB students applying through Australian admissions systems may need the whole-score conversion. Step three is to map the target to the minimum IB value using the converter. Step four is to compare the target with current predicted subject grades and core outcomes. Step five is to build a study plan based on the weakest high-impact components, not just the subjects that feel easiest.

A strong IB plan usually has three layers. The first layer is subject grade protection: keep strong subjects from slipping. The second layer is upgrade strategy: identify one or two subjects where a grade increase is genuinely realistic based on mark boundaries, teacher feedback and past-paper performance. The third layer is core control: complete the Extended Essay and TOK work early enough to avoid emergency work in the final exam period. Students who leave core work too late often lose revision time in their examination subjects. Since one subject grade can be worth a full IB point, and core points can be worth up to three, calendar discipline matters as much as raw intelligence.

Using the converter for university admissions decisions

When using this page for admissions planning, treat the output as a decision-support estimate. For example, if the converter says a target ATAR of 95.00 corresponds to 38.75 IBAS, a student predicted around 39 with strong subject prerequisites is in a reasonable conversation for courses around that threshold. But if a course requires a specific mathematics subject at a minimum grade, meeting the total score alone is not enough. Likewise, if a course uses interviews, auditions, portfolios or admission tests, the ATAR-like value may only be one part of the process.

Students should also be careful with historical cut-offs. A published lowest selection rank from a previous year is not a guaranteed future entry score. Demand, course capacity, applicant quality, institutional policy and adjustment schemes can change. Use previous scores as a planning signal, not a contract. For the most accurate decision, compare at least three sources: the university course page, the relevant tertiary admissions centre information, and your school counsellor’s guidance. Then use this converter to translate the rank target into an IB planning language you can act on.

Common mistakes when comparing ATAR and IB

The first mistake is assuming that 45 IB automatically means 99.95 in every context. The published whole-score table for outside-Australia IB students maps 45 to 99.95, but the Australian fine-grained IBAS table separates values such as 45.00, 45.25, 45.50 and 45.75. The second mistake is assuming that the same IB score is treated identically in every country. Australian admissions centres use a specific national table for Australian tertiary selection, but universities outside Australia may have their own policies. The third mistake is confusing ATAR with selection rank. If adjustments apply, a student’s selection rank may be higher than the ATAR-like value.

The fourth mistake is ignoring diploma conditions. A student can calculate a total but still miss a diploma condition if CAS is incomplete, an E grade appears in TOK or EE, HL points are too low, SL points are too low, or too many low subject grades occur. The fifth mistake is using predicted grades as final results. Predicted grades are helpful for planning and applications, but final IB grades depend on assessed performance, moderation, grade boundaries and official results. A good plan leaves margin. A student targeting 36 should not build a strategy that only works if every subject reaches the optimistic prediction.

Why this page includes both a converter and an IB score calculator

A pure ATAR-to-IB lookup table is useful, but it does not show students what actions to take. This page includes a subject-grade calculator because a target only becomes useful when translated into grade-level decisions. If the converter says a target ATAR requires a whole IB score around 39, the next question is: what combination of six subject grades and core points gets to 39? A student might reach 39 through six strong subject grades and modest core points, or through slightly lower subject grades and excellent TOK/EE performance. The best path depends on subject strengths, deadline pressure and realistic feedback from teachers.

For example, a student with subject grades 6, 6, 6, 6, 5, 5 and 2 core points has 36 points. To reach 39, the student might need three more points. That could mean raising three subjects by one grade, raising two subjects and improving the core, or another combination. The gap planner in this tool turns the conversion into a concrete improvement target. It does not replace a teacher’s grade-boundary analysis, but it creates a clean starting point for planning.

Recommended preparation timeline

Six to nine months before exams, students should confirm university prerequisites, identify HL and SL risk areas, and create a single assessment calendar. Four to six months before exams, the focus should shift to internal assessment quality, Extended Essay completion, TOK essay refinement and systematic past-paper practice. Two to three months before exams, students should work through timed exam components under realistic conditions and track recurring error patterns. In the final month, revision should become selective: protect high-yield concepts, practise full papers, revise command terms, strengthen weak topics and avoid starting large new resources unless they solve a specific gap.

Students applying to Australian universities should also track admissions-centre deadlines. Course preferences, document submission, scholarship applications, special consideration schemes and results-release processes all matter. A student may have an excellent IB score but lose opportunities by missing administrative deadlines. The safest approach is to maintain two calendars: one academic calendar for IB assessment and one admissions calendar for university applications. Parents and counsellors can support students by checking the calendar, not by adding pressure at the last minute.

Final interpretation

The best use of this ATAR to IB Converter is not to obsess over a single number. The best use is to convert a university target into an IB-specific plan. ATAR tells you the admission-rank language. IB points tell you the subject-and-core achievement language. IBAS connects those two languages for Australian IB students. Whole-score conversion connects them for many international IB students applying through Australian tertiary admissions systems. Use the result as a planning guide, then verify final admissions details with the relevant admissions centre, university and school coordinator.