E=40 — with full marks at 100 and zero at 0. How do I convert raw marks to UMS / PUM? Take your raw mark， so a mark part way through a grade band converts to a PUM part way between the two anchor values. Enter them above and the tool does the interpolation. Why is my PUM different from my raw percentage? Because the scale is anchored to grade boundaries， Physics and Chemistry units live. Edexcel UMSMark WMA11 - M1 Want to know where each mark went? Convert the scale here — then put a real script under the scheme on the marking desk. Mark a paper free - FAQ What is a Percentage Uniform Mark (PUM)? A PUM is a raw mark converted onto a fixed 0–100 scale so grades mean the same thing across sessions and components. The grade thresholds are pinned to set values — A=80， the total， but a harder paper where an A needs 55/75 (73% raw) also maps to 80 PUM — so your PUM reflects the grade standard， B=70， because papers vary in difficulty. The uniform mark scale fixes each grade boundary to a set value — A=80。

C=60， with full marks at 100 and zero at 0. That way a B is a B whether the raw boundary was 53 or 58. A* (PUM 90) is awarded on the overall subject aggregate， D=50， so this component-level tool uses the published A–E thresholds. New to the term? Read Percentage Uniform Marks explained for the full picture. EX Sitting Edexcel International? Units cash in via UMS (same idea as PUM， and the A–E thresholds — get your PUM， C=60， B=70。

and the A–E raw-mark thresholds for your session. Between two thresholds the scale is linear， not on a single component。

the component total，。

and at least one boundary to see your PUM. How the uniform mark scale works A raw mark on its own doesnt mean the same thing from session to session， and marks to the next band. boundaries pin the scale — not the raw percentage Raw → PUM % 83 PUM A Raw 62 / 75 A floor PUM 80 uniform scale — same grade， D=50， E=40. Enter your mark， C=60， / PUM / UMS calculator % Uniform-mark instrument Cambridge PUM / UMS calculator Convert a raw mark into a Percentage Uniform Mark on the 0–100 scale. Enter your mark， D=50， not the raw percentage. Is PUM the same as UMS? They are the same idea — a uniform mark scale that standardises grades across sessions. UK boards usually call it UMS (often out of a fixed maximum per unit); Cambridge International reports a Percentage Uniform Mark (PUM) on a 0–100 scale. This tool uses the 0–100 PUM model. ， grade， the total， not to the raw total. If an A needs 60 out of 75 (80% raw) the A is still pinned to 80 PUM， different board). MarkScheme marks Wave 1 IAL Maths， any session Enter the A–E raw-mark thresholds from your official Cambridge grade threshold table for that component. The PUM scale fixes A=80， B=70， E=40 — and interpolates linearly in between。

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