Progress 8 vs Attainment 8: which one should you actually care about?

Look at any secondary school's GCSE results and you'll see two numbers sitting side by side: Attainment 8 and Progress 8. They sound similar, they're both derived from the same GCSE results, and it's easy to assume they're measuring roughly the same thing. They're not — and knowing the difference matters more than either number on its own.

Attainment 8: how well pupils actually did

Attainment 8 is the simpler of the two. It takes a pupil's best 8 GCSE results (with English and maths counted twice, since they're considered especially important), converts each grade to points, and averages them out across the year group. The maximum possible score is 90, though in practice no school gets anywhere close to that — national averages typically sit somewhere in the mid-40s.

Attainment 8 tells you one thing clearly: how strong pupils' actual GCSE results were. What it doesn't tell you is anything about where those pupils started from.

Progress 8: how much a school helped pupils improve

Progress 8 asks a different question entirely: given where a pupil started (based on their Key Stage 2 results in primary school), how much better or worse did they do than similar pupils nationally? A Progress 8 score of `+0.3` means pupils did noticeably better than expected; `-0.5` means they did noticeably worse.

This is why Progress 8 is often considered the fairer measure. A school in an area with a lot of pupils starting from a lower academic baseline could have a modest Attainment 8 score, but still be doing an excellent job — if its Progress 8 score is strongly positive, it means it's getting significantly more out of its pupils than a typical school would. The reverse is also true: a school with high raw Attainment 8 might simply be benefiting from an already high-achieving intake, without necessarily adding much value along the way.

The number that's easy to miss: the confidence interval

Progress 8 scores come with a confidence range — shown as an upper and lower bound around the headline number. This matters more than it might seem. If that range spans zero, the school's Progress 8 score isn't actually statistically distinguishable from the national average, even if the headline number looks impressively positive or worryingly negative. Small schools especially can show dramatic-looking Progress 8 swings that are really just statistical noise from a small cohort — worth reading alongside our piece on why small year groups can be misleading.

So which one should you look at?

Use them for different questions:

• Want to know how academically strong the current pupils are, in absolute terms? Look at Attainment 8.
• Want to know how much a school actually helps pupils improve, regardless of their starting point? Look at Progress 8 — and check the confidence range before reading too much into it.

Ideally, look at both together. A school with high Attainment 8 and strongly positive Progress 8 is doing well by any measure. A school with modest Attainment 8 but strong Progress 8 might be quietly doing an excellent job with a challenging intake — often more impressive than the raw numbers suggest at first glance.

One important caveat right now: Progress 8 isn't available at all for the two most recent GCSE cohorts, due to a data gap caused by the pandemic. We've explained exactly why in a separate piece, since it affects how you should read almost every secondary school's current results.