Edexcel A-level Chemistry grade boundaries 2025: every grade

Edexcel A-level Chemistry (9CH0) boundaries, 2025

These are from Pearson's June 2025 GCE document. Chemistry is linear: all three papers are sat in one summer and the total is read against the line.

See the Edexcel A-level Chemistry guide for the course and the data sheet guide. For every subject, see Edexcel A-level grade boundaries 2025.

What the three papers are

Paper 1 leans on inorganic and physical chemistry, Paper 2 on organic and physical, and Paper 3 covers general and practical principles. Pearson says at least 20% of the marks across the papers are for mathematics at Level 2 or above.

A year of falling boundaries

Adding June 2024:

Chemistry was the one A level among our five where every A level line fell. The movement was A* −6, A −9, B −7, C −5, D −3, E −1. The A line fell furthest, by 9. AS moved the other way, with A going from 105 to 106.

Ofqual says if a question paper is more difficult, the grade boundaries will be lower. A fall like this is a signal about the 2025 papers, not about your ability.

A 2025 worked example

A student scores 80 on Paper 1, 70 on Paper 2 and 82 on Paper 3. The total is 80 + 70 + 82 = 232 out of 300. The 2025 lines are A* 246 and A 207, so 232 is an A, 14 marks short of an A*. Under the 2024 lines (A 216, A* 252) it would also have been an A, 20 short.

Paper 3 is the biggest paper, so the 82 there matters most: it is out of 120.

Practicals and the endorsement

The Science Practical Endorsement is assessed by your teacher and monitored by Pearson, and is reported as a pass separately from the grade. The 16 core practicals in the specification are also examined in the written papers, so practical work earns marks in the 300 as well. None of this alters where the boundaries sit.

The step between grades in 2025 was 39 from A* to A, 37 from A to B and 37 from B to C, so the bands are close to equal width, around 30 to 40 marks each.

What the shares tell you

• An A* needed 82% in 2025, against 84% in 2024.
• A grade C needed 44%.
• Calculation questions such as moles, equilibrium constants and energetics are where the mathematics marks are.

Try today's Chemistry Year 1 or Year 2 paper. It is 8 questions and 25 to 35 marks, not an Edexcel paper, so compare the share with the table.

Read next

UK · A-levelEdexcel A-level grade boundaries 2025: marks for every gradePearson's official June 2025 Edexcel A-level boundaries for Maths, Further Maths, Physics, Chemistry and Biology A and B, compared with 2024.