Understanding Progress 8: What the Numbers Actually Mean

If you're researching secondary schools, you'll encounter Progress 8 everywhere — in league tables, on school profiles, and in Ofsted reports. It's arguably the single most important metric for judging a secondary school. But it's also widely misunderstood.

What Progress 8 measures

Progress 8 compares a school's GCSE results against what was predicted based on pupils' KS2 (age 11) results. It answers one question: did this school add more value than the average school with similar pupils?

• 0 = exactly average progress
• +0.5 = pupils achieved about half a grade higher per subject than predicted
• -0.5 = pupils achieved about half a grade lower than predicted (“well below average”)

Why it matters more than raw results

A grammar school with 70+ Attainment 8 might have Progress 8 near zero — their pupils were already high-achievers at age 11, so the school merely maintained that trajectory. Meanwhile, a comprehensive with Attainment 8 of 45 might have Progress 8 of +0.8, meaning it dramatically improved outcomes for its intake.

Progress 8 tells you what the school did for its pupils. Attainment 8 tells you what the pupils achieved. Both matter, but Progress 8 reveals the school's quality more fairly.

What's a “good” score?

Context matters, but as a rough guide:

• Above +0.5: Significantly above average — the school is adding exceptional value
• +0.2 to +0.5: Above average — solid progress
• -0.2 to +0.2: Average — in line with national expectations
• -0.5 to -0.2: Below average — worth investigating why
• Below -0.5: Well below average — likely to trigger Ofsted concern

The confidence interval caveat

Every Progress 8 score comes with a confidence interval. A school scoring +0.1 with a confidence interval of -0.2 to +0.4 might not be meaningfully different from zero. Small schools (under 100 pupils in Year 11) tend to have wide confidence intervals, so their scores are less reliable.

How to use Progress 8 on School Atlas

On every secondary school profile, the Performance tab shows Progress 8 with historical trends. On league tables, you can sort by Progress 8 to find schools adding the most value in your area.

Pro users can see 15 years of Progress 8 trends, which reveals whether a school is consistently strong or riding a one-year anomaly.

The bottom line

When comparing secondary schools, check Progress 8 first to understand quality, then Attainment 8 to understand outcomes. A school with positive Progress 8 is more likely to get the best out of your child — whatever their starting point.