How many hours do you need to prepare for IELTS? A method, not a number
The only large study of IELTS score gain gives a rate, not a total. Here is how to turn your own four-skill gap into an hour budget, with worked examples.
Study timelineGeneralUpdated 7 min read
Search for this question and you will find answers from "two weeks" to "a year". They cannot all be right, and in fact none of them can be, because the question has no answer without two more numbers: where you are now, on each skill, and where you need to be. What research does give you is a rate: how many hours of study buy how much band, on average. Put your own gap into that rate and you get a budget instead of a guess. This article shows the arithmetic and then does it for four typical candidates.
The rate
The largest published study on this, Elder and O'Loughlin (2003), tracked 112 students through 10 to 12 weeks of intensive English, around 200 to 240 hours of instruction, testing them on IELTS Academic at the start and the end. The average gain was about half a band overall. Two qualifications from the same study matter for your budget:
- gains were larger for lower starting bands and smaller above band 6, where what remains to fix is precision rather than basics;
- the gain was an average across a wide spread. Some students gained a full band in the period; some gained nothing measurable.
So the planning rate is roughly 200 to 240 hours per half band of overall score, slower above 6, and it is a rate for instruction with feedback, not for hours spent alone with a book of past papers. The argument for why this makes a "6 to 7 in six weeks" promise dishonest is in how long band 6 to 7 takes; this article is about the budget itself.
Two kinds of hours
Not all preparation buys the same thing, and the study measured only one kind.
Technique hours teach you the test: the question types, the timing, the traps, how Task 1 is organised, what Part 2 of Speaking wants. These hours are cheap and finish quickly. A candidate who has never seen a matching-headings task can gain several raw marks on Reading in an afternoon. Technique is worth, at most, half a band on Reading and Listening for a candidate who has never prepared, and rather less on Writing and Speaking. It does not repeat: once you know the test, more technique buys nothing.
Language hours raise the English itself: the range of grammar you control, the vocabulary you can use precisely, the speed at which you read, the ability to follow a fast speaker. These are the 200-hours-per-half-band hours. They are slow, and they are the only thing that moves a band beyond the first technique gain.
The method
- Measure your four bands now. Not your feeling about them: a timed test of each skill, scored against the criteria. Candidates are usually wrong about their weakest skill by at least half a band.
- Work out the gap in half-band steps. Your overall band is the mean of the four, rounded to the nearest half (.25 rounds up). To be reported as a 7 you need a mean of 6.75; for a 6.5, a mean of 6.25. Count the half-band steps, across all four skills, that get you to that mean. If your institution sets a minimum per skill, count the steps that lift each skill to it, whichever is larger.
- Budget the technique hours. About 20 to 30 hours if you have never prepared, spread over the skills; near zero if you have taken the test before.
- Budget the language hours. Half-band steps in the overall mean cost 200 to 240 hours each; treat a half-band step in a single skill as roughly a quarter of that, because the overall mean moves by an eighth of a band when one skill moves by half. Add a quarter again for every step above band 6.
- Divide by your honest weekly hours, and compare the result with your exam date. If it does not fit, the choices are a later date, more hours, or a lower target, and the arithmetic will not change because you would prefer it to.
Four worked budgets
All four assume no previous attempt (so technique hours are included) and a target of 7 overall with no per-skill minimum.
| Candidate | Listening / Reading / Writing / Speaking now | Mean now | Half-band steps needed | Technique | Language | Total | At 10 hours a week |
|---|---|---|---|---|---|---|---|
| A | 7 / 7 / 6.5 / 6.5 | 6.75 | 0 (already at 6.75) | 25 h | 0 h, plus a margin because the mean sits exactly on the line | about 40 h | 4 weeks |
| B | 7 / 6.5 / 6 / 6.5 | 6.5 | 2 (mean up by 0.25) | 25 h | 2 steps in single skills at about 55 h each, plus a quarter for being above 6: about 140 h | about 165 h | 16 to 17 weeks |
| C | 6.5 / 6.5 / 5.5 / 6 | 6.125 | 5 (mean up by 0.625) | 25 h | the cheapest route is Writing +1.0, Speaking +0.5, Reading +0.5, Listening +0.5: 5 steps, two of them below 6 and cheaper, about 300 h | about 325 h | 32 to 33 weeks |
| D | 6 / 6 / 5.5 / 5.5 | 5.75 | 8 (mean up by 1.0) | 30 h | roughly two half-band steps in the overall mean at 200 to 240 h each, most of it below 6: about 450 h | about 480 h | 48 weeks |
Candidate A is the person the two-week advice is written for, and for them it is right: the language is there, and the test is the only thing to learn. Candidate D is the person that advice damages most. Forty-eight weeks at 10 hours a week is a real answer, and a candidate who is told "three months" will sit the exam three times and blame themselves.
Candidate C shows why the diagnostic comes first. Their instinct will be to work on Writing, which is their lowest band, and the arithmetic agrees that Writing is where the biggest step is. But the budget also says that three of the five steps are half-band gains in skills that are already at 6 or 6.5, and those are the slow, above-6 hours. If their institution accepted a 6.5 overall, the same candidate would need only two steps and about 130 language hours. Knowing the real target changes the plan more than any study technique.
What changes the rate for you
- Feedback on Writing and Speaking. The study measured instruction, meaning someone graded the students' work. Writing essays that nobody scores against the criteria is practice at your current band. If you are budgeting language hours for the productive skills, budget them as hours with feedback or double them.
- Where you start. Below band 6, hours buy more. A candidate at 5.0 should expect the study's average rate or better; a candidate at 7.0 chasing 7.5 should expect worse.
- Retakes. A previous attempt removes the technique hours and, more usefully, gives you four real bands to put into step 2 instead of an estimate.
What to do this week
Take one timed test per skill and write the four numbers down — a free Reading and Listening diagnostic covers two of them, scored by question type, with no account needed. Run steps 2 to 5 above with your real weekly hours. If the total fits before your exam date, you have a plan; if it does not, you have found out now rather than on results day, and that is what the arithmetic is for. And if the budget lands around three months, a 90-day plan that gives each month a different job is a ready-made way to spend it.