What is Progress 8? A Parent's Guide to the School Performance Measure That Actually Matters
Progress 8 is the government's headline measure for secondary school performance - but most parents have never had it properly explained. Here is what the score actually means, how to read it, and why it tells you far more than a simple league table position.
What is Progress 8? A Parent's Guide to the School Performance Measure That Actually Matters
If you have ever tried to compare secondary schools and found yourself drowning in percentages, league tables and Ofsted grades, you are not alone. Progress 8 is the government's headline measure for secondary school performance, and once you understand it, it cuts through a lot of the noise. Here is what it means, how to read it, and why it is more useful than the raw results you might see in a newspaper league table.
What Progress 8 Actually Measures
Progress 8 was introduced by the Department for Education (DfE) as the main performance measure for secondary schools in 2016. The idea behind it is straightforward: rather than simply asking "how well did pupils do at GCSE?", it asks "how much did pupils improve between primary school and their GCSEs?"
Every pupil in England sits Key Stage 2 (KS2) assessments at the end of primary school, usually at age 10 or 11. Progress 8 takes those results as a baseline and then measures each pupil's GCSE outcomes against what pupils with the same KS2 starting point achieved nationally. In other words, it compares a child against their peers who arrived at secondary school at a similar level.
The measure looks at results across eight GCSEs - hence "8" - grouped into three buckets. English and Maths are double-weighted because they matter most. Then there is a slot for the EBacc subjects (sciences, languages, humanities), and finally a further slot for other approved GCSEs or vocational qualifications.
Reading the Numbers
The Progress 8 score for a school is expressed on a scale that runs roughly from -3 to +3. The national average is always set at 0, so:
- Above 0 means pupils at that school made more progress than pupils nationally with the same starting points. A score of +0.5, for example, suggests pupils did roughly half a grade better across those eight subjects than peers who arrived at secondary school at a similar level. - At or near 0 means progress was broadly in line with the national average. - Below 0 means pupils made less progress than expected, relative to peers with similar starting points elsewhere.
The DfE publishes confidence intervals alongside each score, because a school with a very small cohort could have a figure that looks dramatic but is statistically unreliable. A score that is not statistically significantly different from 0 is generally treated as average, regardless of whether it sits slightly above or below.
The DfE flags any school with a Progress 8 score below -0.5 as a school that may need additional support. Scores below -1 are serious.
Why Progress 8 Beats Raw Results
Here is the problem with headline percentages. If a school in an affluent area reports that 85% of pupils got grade 5 or above in English and Maths, that might sound impressive. But if those pupils arrived at secondary school already reading and working two years ahead of their peers, the school may not have added much at all. Conversely, a school serving a deprived community might report 55% and look much weaker - yet if those pupils started well behind the national average and the school moved them on significantly, that is a remarkable achievement.
Progress 8 accounts for intake. It does not penalise schools for taking on pupils who arrive at secondary school with lower attainment, and it does not reward schools simply for having a high-attaining cohort. This makes it a much fairer basis for comparing schools with very different catchment areas.
It is also worth knowing about the paired measure: Attainment 8. This is the raw version of the same calculation - it averages the actual GCSE grades across those same eight subjects, without the comparison to a pupil's starting point. Attainment 8 tells you about outcomes in absolute terms; Progress 8 tells you about what the school contributed. Both are published alongside each other, and together they give a fuller picture.
A Worked Example
Imagine two pupils, both with identical KS2 scores - let us say they both sat their Year 6 assessments at exactly the national average. Nationally, pupils with that starting point typically go on to achieve a set of GCSE grades that the DfE calculates in advance. Call that the expected outcome.
Pupil A goes to School X and ends up with grades that, when added up across the eight slots, come in one full grade higher than expected on average. That contributes a positive figure to School X's Progress 8 score.
Pupil B goes to School Y and ends up with grades that average one full grade lower than expected. That drags School Y's score down.
Progress 8 for a school is essentially the average of these individual pupil scores across the whole Year 11 cohort. A school with a score of +0.3 is doing genuinely better than average; a school with -0.4 is falling short - regardless of whether the raw grades look high or low.
How to Use Progress 8 in Your School Research
The most common mistake parents make is focusing only on the percentage passing English and Maths, or on headline Ofsted grades, and stopping there. Progress 8 is worth adding to your checklist for every secondary school you are seriously considering.
A few things to watch for:
Check the confidence interval. If the published range overlaps with 0, the school is not statistically distinguishable from average, whatever the headline figure says. A score of +0.2 with a wide interval is not evidence of anything.
Look at trends over time. A single year's figure can be affected by an unusual cohort. Three or four years of consistently positive scores tells you far more than one strong result.
Consider it alongside other measures. Progress 8 does not capture everything. Sixth-form provision, pastoral care, specific subject strengths, and your child's particular needs all matter. Use it as one lens, not the only one.
Do not overlook schools with modest absolute grades. A Progress 8 score of +0.5 at a school where Attainment 8 is lower than at a nearby school could mean pupils there genuinely thrive and leave better prepared, even if raw results look less glossy.
You can find Progress 8 scores for every state secondary school in England on School Signal school profiles, alongside Ofsted ratings, Attainment 8 figures, and other key data. The DfE also publishes the full tables each January for the previous academic year at the School Performance Tables on GOV.UK.
Progress 8 will not tell you everything about a school. But it will tell you something that raw league tables cannot: whether a school is actually moving its pupils forward.