What is a Progress 8 score?

At every parents’ evening, somewhere on the wall, there is a number written in small print under the school’s GCSE results. Sometimes it is positive, sometimes negative, often quite close to zero. Nobody at the meeting tends to explain it. That number is Progress 8, and it is arguably the most useful single line on the page.

What it is, in plain English

Progress 8 measures how much progress a secondary school made with its pupils between the end of primary (their Key Stage 2 results) and the end of Year 11 (their GCSEs), compared to other schools nationally that started with children at the same level. The Department for Education calculates it for each cohort once GCSE results are published.

Zero is the national average. A positive score means the school’s pupils did better at GCSE than would have been predicted from where they started. A negative score means they did less well than predicted. The number itself is in “GCSE grades per subject, averaged across eight subjects” — so a Progress 8 of +0.5 means the average pupil at this school got half a grade higher per subject than statistically-similar pupils elsewhere.

It is a measure of the school, not of any individual pupil. It says nothing about what a particular child would or would not achieve there.

Why it matters more than Attainment 8

Attainment 8 is the raw average GCSE grade across eight subjects. It is genuinely useful as a headline, but it has a problem: a school in a wealthy catchment will almost always show a higher Attainment 8 than a school in a less wealthy one, because the pupils arrive with stronger Key Stage 2 results in the first place. The headline rewards the intake, not the school.

Progress 8 corrects for that. By comparing each cohort to statistically-similar pupils nationally, it isolates what the school actually added. A grammar school with a Progress 8 of +0.1 is doing roughly what was already expected of those children. A non-selective school with a Progress 8 of +0.5 is doing something unusual — likely better teaching, better support, better culture. The latter, all else equal, is the more impressive result.

For parents comparing schools that draw from very different catchments, Progress 8 is the fairer ruler.

The confidence interval (please read this bit)

A single Progress 8 score comes from a single cohort, often only a couple of hundred pupils. That is not a huge sample. The Department for Education publishes a 95% confidence interval alongside the score — the range the “true” underlying value could plausibly sit within. It is the most honest part of the whole measure, and it is the part that gets ignored most often.

If a school’s Progress 8 is +0.4 with a confidence interval of +0.2 to +0.6, that is genuinely strong evidence. If it is +0.4 with a confidence interval of -0.1 to +0.9, the underlying truth could easily be anywhere from below-average to excellent, and the headline of +0.4 is more rounding than fact. Whenever an interval crosses zero, the safest read is “broadly average” — not the headline number on its own.

On every school page on NestScope, the confidence interval appears underneath the Progress 8 figure, with a plain-English band (above / broadly / below average) so the interval’s implication is visible without statistics.

How to read it as a parent

Three things keep Progress 8 useful rather than misleading. First, look at the band, not the headline number. “Broadly average” covers a wide range and is genuinely the most common honest answer. Second, look at the trend across years if the school page shows it — a school that has moved from -0.4 to +0.2 over three years is doing something different from a school that has been at -0.4 the whole time. Third, never let Progress 8 be the only thing. It tells you about academic value added; it tells you nothing about pastoral care, friendships, the music programme, or whether your child will be happy walking through the gates.

When Progress 8 disagrees with the Ofsted grade, both are worth taking seriously and the truth is usually that the school has shifted since one of them was measured. Pair the two with a visit and you have a fairer picture than either gives alone.

The DfE bands

The Department for Education uses these official descriptors:

• Above +0.5 — well above average
• +0.0 to +0.5 — above average
• -0.5 to 0 — below average
• Below -0.5 — well below average

Anything beyond ±1.0 is rare and almost always tells a specific story (a tiny cohort, a single year’s exam disruption, a school newly merged) that the headline number cannot capture. The DfE itself recommends not using Progress 8 to compare schools when their confidence intervals overlap meaningfully.

Frequently asked

Why does the score change year-to-year?

Because the cohort changes. The Progress 8 score is recalculated each year from that year’s Year 11 leavers. A strong cohort one year and a weaker one the next can move the score by 0.2 or 0.3 without anything changing about the teaching. That is partly why the trend matters more than the single most recent number.

Is Progress 8 fair to special needs pupils?

The model adjusts for prior attainment but not for additional educational needs, deprivation or disability. The Department for Education publishes a series of breakdowns alongside Progress 8 (disadvantaged pupils, EAL, SEN) that show how different groups within the same school progressed. A school’s headline Progress 8 can mask large differences between groups; for a parent of a child with specific needs, the breakdown is often more important than the headline.

Do primary schools have a Progress 8?

No. Progress 8 is a secondary-school measure. The equivalent at primary level is the Reading / Writing / Maths progress scores at Key Stage 2 — also calculated as the school’s value added compared to similar starting points, and also published with confidence intervals. The principle is the same; the subject and stage differ.

What about independent schools?

Most independent schools enter pupils for the IGCSE rather than the GCSE, and they do not appear in the Department for Education league tables in the same way. A Progress 8 figure is therefore usually unavailable for them. The schools themselves publish their own results — read them critically: comparing a selective independent to a non-selective state school on raw GCSE grades is not a like-for-like.

Related reading

• How to find a school’s Ofsted rating — the other headline number, and how to weigh the two together.
• Best free school finder tools in the UK — what each one is actually best at.
• Schools near me — finding UK schools by postcode — the practical walkthrough.
• Look up any England school on NestScope — Progress 8 + confidence interval shown on every secondary’s page.