How GCSE grades work (2026): the 9-1 scale, old letter equivalents, and tiers

GCSE results in England come back as numbers, not letters, and the change still trips up parents, employers, and students who grew up with A* to G. This guide explains the 9 to 1 scale exactly as Ofqual defines it: what each number means, how it lines up with the old letters, where the "pass" actually sits, and why the grade boundary you needed is never announced until results day.

The 9 to 1 scale

GCSEs in England have been graded on a 9 to 1 scale since 2017, replacing the previous A* to G scale. The highest grade is 9, the lowest is 1, and U means "ungraded".

The reform did more than relabel grades. It spread the top of the scale over three numbers (7, 8, 9) where the old scale had two letters (A, A*), specifically to separate the strongest candidates more finely. So 9-1 is not just A*-G with numbers swapped; the boundaries fall in different places.

How 9 to 1 compares with A* to G

The most important thing Ofqual says about the two scales is that the number scale is not directly equivalent to the old letter one. You cannot simply translate a 6 into a "B" and be done. What Ofqual does provide is three fixed comparison points:

• the bottom of a grade 7 is comparable to the bottom of the old grade A
• the bottom of grade 4 is comparable to the bottom of the old grade C
• the bottom of grade 1 is comparable to the bottom of the old grade G

Everything else is interpolated between those anchors. A useful way to hold the top end in your head:

• Grade 9 is higher than the old A*. It is a new, more selective top grade; fewer students get a 9 than used to get an A*.
• Grade 8 is above an old A but below an old A*.
• Grade 7 is broadly the old A.
• Grades 7, 8 and 9 together cover roughly the territory of the old A and A*.

Standard pass and strong pass

There is no single official "pass/fail" line at GCSE, which is why people get confused about what counts as a pass. Two thresholds matter:

• Grade 4 is a "standard pass". A grade 4 or above marks a similar achievement to the old grade C or above. The Department for Education recognises grade 4 and above as a standard pass in all subjects.
• Grade 5 is a "strong pass". This sits in the middle of the old grade C / bottom of the old grade B region and is the threshold some sixth forms, colleges, and league-table measures use.

A consequence worth knowing in English and maths: DfE policy states that students who are awarded a grade 3 or below in maths and/or English must be offered support to make progress in those subjects if they continue into further education. In practice that usually means resitting (covered in our resits and remarks guide).

Foundation and higher tier

Some GCSE subjects, most notably maths, the sciences, and modern languages, are split into two tiers. You sit one or the other, and the tier caps the grades available to you:

• Foundation tier covers grades 1 to 5. The top grade you can achieve is a 5.
• Higher tier covers grades 4 to 9 (with a narrow safety-net allowance: a candidate who just misses grade 4 on higher tier can be awarded an "allowed grade 3" rather than a U).

The choice of tier is made by the school, usually after mocks, based on which tier gives you the best chance of your target grade. The trade-off is real:

• Higher tier is the only route to grades 6 to 9, so if you are aiming for a strong pass you generally must be entered for it.
• Foundation tier asks more accessible questions, so a borderline student can often secure a solid grade 4 or 5 on foundation rather than risk a low grade or a U by being stretched on higher.

Subjects that are not tiered (English language, English literature, history, geography, and most humanities) use a single set of papers across the whole 9 to 1 range.

The combined science "double grade"

Most students take combined science, which is worth two GCSEs and is reported as a double grade, for example 9-9, 9-8, 8-8, 8-7, and so on. The two digits can be the same or one apart. It is graded on a 17-point scale running from 9-9 down to 1-1. Students taking the three separate sciences (biology, chemistry, physics) instead receive three individual 9-1 grades.

Why grade boundaries move every year

As with A-levels, new grade boundaries are set each year for every paper. After exams are marked, grades are awarded using a combination of statistical data and senior examiner judgement, so that it is no easier or harder to get a grade in any given year, even though the papers differ in difficulty.

The mechanism is the same as at A-level: a harder paper gets lower boundaries, an easier paper gets higher ones, anchored by data on the prior attainment (in this case mainly Key Stage 2 results) of the cohort. This "comparable outcomes" approach keeps national grade distributions broadly stable from year to year.

A worked sense of the maths

Imagine a foundation-tier subject with two papers, each out of 80 (160 total):

• You score 58 and 62. Total: 120/160.
• The board sets this year's foundation boundaries (after marking) at, say, grade 5 = 116, grade 4 = 94, grade 3 = 72.
• Your 120 clears the grade 5 boundary (116). On foundation tier, 5 is the ceiling, so your grade is 5, the best available on that tier.

The same raw performance on higher tier might not have reached grade 5 at all, because higher-tier boundaries are positioned for a more demanding paper. This is exactly why tier choice matters: the grade you can realistically reach depends on which paper you sat.

Nations note

The 9 to 1 scale is an England system. Wales and Northern Ireland use different GCSE grading scales (Wales retains A*-G in many subjects through WJEC; Northern Ireland uses a 9-1 style scale with a C* and some letter reporting through CCEA). If you are sitting GCSEs in Wales or Northern Ireland, check your own board, because the numbers in this guide are the English convention.

What this means for you

• Aim for at least a 4 in English and maths. It is the standard pass, it is what most employers and colleges expect, and a 3 or below triggers a resit obligation in those two subjects.
• Know whether your subject is tiered, and have an honest conversation about which tier gives you the best shot at your target grade.
• Do not over-translate to old letters. Use Ofqual's three anchor points (7 = old A, 4 = old C, 1 = old G) and resist the urge to map every number to a letter.
• Ignore last year's boundaries as a target. They move every year. Maximise your total mark instead.

In summary

GCSEs in England run 9 (top) to 1 (bottom), anchored to the old letters at three points, with grade 4 as a standard pass and grade 5 as a strong pass. Tiered subjects cap your grade range by the paper you sit, and boundaries are reset every August to hold standards steady. Get those few facts straight and the number scale stops feeling like a code.