If you are looking for clear information on Edexcel IGCSE Chemistry grade boundaries, this guide covers the paper structure for syllabus 4CH1, the grade thresholds Pearson Edexcel has published in recent years, the patterns they follow, and the most-asked question for any IGCSE Chemistry candidate: what raw mark do I need for an A* in Edexcel International GCSE Chemistry?

Pearson Edexcel publishes official grade boundaries for every subject after each series. The published documents are authoritative — but they are dense and rarely give a student the answer they need quickly. Below we summarise how Edexcel IGCSE Chemistry 4CH1 is graded, what the boundaries usually look like, and how to use them while you revise.

Free tool: Use Tutopiya’s Edexcel IGCSE Chemistry grade boundary tracker (4CH1) to enter your raw mark and instantly see the most likely grade band based on published Edexcel thresholds.

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How Edexcel IGCSE Chemistry grade boundaries work

A grade boundary is the minimum total raw mark required for a particular grade. For Pearson Edexcel International GCSE Chemistry (syllabus code 4CH1), grades range from A* down to G, with anything below G ungraded.

Three points to remember:

1. Boundaries are set after marking. Edexcel looks at the difficulty of the actual papers sat and the cohort’s performance, then sets thresholds so that comparable candidates receive comparable grades.
2. Thresholds change every series. A May/June boundary is not the same as a January boundary. They cluster within a band, but the exact mark moves up or down each session.
3. Boundaries are total marks, not percentages. Edexcel publishes them as raw marks out of the total available across both papers.

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Edexcel IGCSE Chemistry paper structure (4CH1)

Pearson Edexcel International GCSE Chemistry (4CH1) is assessed across two written papers:

Paper	Title	Marks	Duration
1C	Chemistry Paper 1	110	2 h
2C	Chemistry Paper 2	70	1 h 15 min

A candidate sitting 4CH1 takes both papers for a combined total of 180 marks. There is no Internal Assessment for Edexcel IGCSE Chemistry; the qualification is fully assessed by external written examination.

Edexcel publishes a single set of A*–G thresholds per series, applied to the combined raw mark.

For full details, refer to the Edexcel International GCSE Chemistry specification and your school’s exam officer.

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What raw mark do I need for an A* in Edexcel IGCSE Chemistry?

Across recent series, the A* threshold for Edexcel IGCSE Chemistry 4CH1 has typically required somewhere in the 80–90% range of total marks — but the exact figure shifts each session.

Representative bands from published Edexcel thresholds:

• A* has commonly required around 82–88% of total marks (around 148–158 out of 180).
• A has commonly required around 70–76%.
• B has commonly required around 58–64%.
• C has commonly required around 46–52%.
• D has commonly required around 34–40%.
• G (the pass mark) has commonly sat around 18–24%.

Two caveats apply:

1. These are typical bands, not predictions. A particular series might sit a few marks above or below.
2. Edexcel publishes thresholds as raw marks, not percentages. Always work from the published raw-mark threshold for the specific series.

The Tutopiya grade boundary tracker for Edexcel IGCSE Chemistry stores published threshold data and converts your raw mark into a likely grade band.

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Why Edexcel IGCSE Chemistry boundaries move each series

Three factors drive most of the year-to-year variation:

• Paper 1C difficulty. Paper 1C carries 110 marks and decides much of the final grade. A particularly demanding question on equilibrium, organic chemistry, electrolysis or moles will see Edexcel lower the threshold slightly.
• Paper 2C variation. Paper 2C carries 70 marks and includes more demanding extended-response questions. Variations between series can move the overall threshold by a few marks.
• Cohort performance. If the global cohort performs unusually well or poorly, thresholds adjust to maintain fair comparison with previous years.

This is why Edexcel does not publish boundaries before the series.

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How to use Edexcel IGCSE Chemistry boundaries while you revise

Grade boundaries are most useful before results day. Three practical applications:

1. Convert past-paper marks into a target grade

When you sit a past Paper 1C under timed conditions and score 82/110, that number alone tells you little. Cross-reference with the published threshold for that series and you immediately know whether you are tracking at A, B or C standard. The Edexcel IGCSE Chemistry tracker does this conversion automatically.

2. Identify the gap to your next grade

If you are scoring 70% combined and the historical A* boundary is 84%, you know you need to pick up around fourteen percentage points to be on the A* border. Combine the gap with a confidence-rated revision checklist to choose where those marks come from — typically moles calculations, organic chemistry, equilibrium and electrolysis.

3. Sanity-check your predicted grade

Schools issue predicted grades for sixth-form, A Level and IB applications based on mock performance. If your predicted grade looks higher or lower than the boundary maths suggests, raise it with your teacher early.

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Edexcel IGCSE Chemistry grade boundaries by paper component

Edexcel publishes component-level thresholds alongside overall thresholds. Component thresholds are useful when you want to know what an “A standard” performance on Paper 1C specifically looked like in previous series. For most students, the overall combined threshold is the number that decides the final grade.

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Edexcel IGCSE Chemistry grade thresholds: where to find the official numbers

Pearson Edexcel publishes a grade boundaries document for each series shortly after results day. Three reliable routes:

1. Pearson Qualifications website → Support → Marking and grade boundaries → International GCSE.
2. Your school’s exam officer receives the document as part of the results pack.
3. Tutopiya’s grade boundary tracker stores recent published thresholds for reference.

A note on data freshness: the 2026 thresholds for the May/June 2026 series have not been set at the time of writing — they are released on results day in August 2026.

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Common mistakes students make with Edexcel IGCSE Chemistry grade boundaries

• Using last year’s threshold as a target without margin. Aim for a buffer of 8–10 marks above the historical threshold.
• Mixing 4CH1 (Edexcel International GCSE) with 1CH0 (Edexcel UK GCSE). They are different qualifications with different paper structures and different threshold tables.
• Comparing 4CH1 thresholds to Cambridge IGCSE Chemistry (0620). Edexcel and Cambridge International grade independently.
• Forgetting the grade is set per-series. January and May/June within the same year have separate thresholds.

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Edexcel IGCSE Chemistry revision: from threshold to grade

Published thresholds tell you the destination. The route is the same set of evidence-based revision habits:

• Past-paper Paper 1C timing practice. Sit a full Paper 1C in 2 hours, marked against the official mark scheme, at least once a fortnight in the final eight weeks. Use the past paper exam timer to enforce timing.
• Topic-by-topic confidence rating. Use the Edexcel IGCSE Chemistry revision checklist to mark your confidence in each syllabus topic.
• Mathematical fluency. A high proportion of Chemistry marks are arithmetic — moles, percentage yield, electrolysis calculations, energy changes. Drill full calculations rather than checking method only.
• Definition and command-word precision. Examiners reward exact wording. Revise the Edexcel command words — describe, explain, calculate, suggest — and the keyword definitions Edexcel expects.

For broader Edexcel IGCSE Chemistry preparation, see our Edexcel IGCSE Chemistry common mistakes guide.

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Frequently asked questions

What are Edexcel IGCSE Chemistry grade boundaries?

Grade boundaries are the minimum total raw marks required for each grade (A* to G) in Pearson Edexcel International GCSE Chemistry 4CH1. Edexcel publishes a table after each series with the overall threshold and component-level thresholds.

What raw mark do I need for an A* in Edexcel IGCSE Chemistry 4CH1?

The A* threshold has typically required around 82–88% of total marks across recent series, but the exact figure changes every session. Use the Tutopiya grade boundary tracker to check the latest published threshold and convert your raw mark.

Are 2026 Edexcel IGCSE Chemistry grade boundaries published yet?

No — Edexcel publishes grade thresholds on results day. For the May/June 2026 series, thresholds will be released in August 2026.

Where can I find the official Edexcel grade boundaries document?

On the Pearson Qualifications website, under Support → Marking and grade boundaries → International GCSE. Your school’s exam officer also holds the document.

Are Edexcel IGCSE Chemistry and UK GCSE Chemistry the same qualification?

No. Edexcel International GCSE Chemistry (4CH1, A*–G) and Edexcel UK GCSE Chemistry (1CH0, 9–1) are separate qualifications with different paper structures and grade scales.

Why do Edexcel IGCSE Chemistry boundaries change every series?

Boundaries are adjusted for paper difficulty and cohort performance so that comparable candidates receive comparable grades across series.

Are Edexcel IGCSE boundaries the same as Cambridge IGCSE Chemistry boundaries?

No. Edexcel (4CH1) and Cambridge International (0620) IGCSE Chemistry have separate thresholds, separate paper structures and separate mark totals.

Does Paper 1C or Paper 2C matter more for the A*?

Paper 1C carries 110 marks (61% weight) and Paper 2C carries 70 marks (39% weight). The A* is decided largely by Paper 1C performance, but a strong Paper 2C can lift a borderline A candidate into A*.

What happens if I miss the A* boundary by one mark?

Edexcel does not round up. A candidate one mark below the A* threshold is awarded A. Reviews of marking can be requested through your school exam officer if you believe a paper has been mis-marked.

How accurate is the Tutopiya grade boundary tracker?

The tracker uses published Pearson Edexcel grade thresholds for past series and is for reference only. The 2026 thresholds will be set after the May/June 2026 series.

Does the January series have different boundaries from May/June?

Yes — Edexcel sets separate thresholds for each series. January cohorts and May/June cohorts can differ in size and ability profile, which can shift the threshold by a few marks.

Does my calculator usage affect grade boundaries?

The supplied permissions do not directly affect boundaries — Edexcel sets the same paper for every candidate. However, candidates who use their calculator efficiently typically gain a few marks per paper on calculation-heavy questions, which over a 180-mark total moves them up a grade band.

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Last reviewed: 29 April 2026. Pearson Edexcel grade thresholds are released on results day for each series. Always verify current boundaries on the official Pearson Qualifications website or with your school exam officer.

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