About This UMS to Raw Mark Converter

This free, fast UMS to raw mark converter helps students, teachers, and tutors translate between exam Uniform Mark Scale (UMS) scores and underlying raw marks. Many exam boards scale raw marks to a consistent UMS range so papers of different difficulty remain comparable. However, official converters are often slow to access or hidden inside PDF grade boundary documents. This sleek single‑page tool removes friction by letting you set your own grade boundaries and instantly perform bi‑directional conversion with piece‑wise linear interpolation.

Unlike simplistic calculators that only apply a straight proportional formula, this version lets you enter custom raw and UMS values for grades (A*, A, B, C, etc.). The calculator then estimates intermediate marks using locally relevant slopes, giving more realistic approximations when grade spacing is uneven. It is purposely lightweight, privacy‑friendly (no data is sent anywhere), mobile responsive, and compatible with WordPress or Kadence theme embeds.

How to Use

1. Enter the Max Raw Marks for the paper and the Max UMS (often 100 or 80).
2. Optionally add or adjust grade boundaries: type the raw mark that yields each grade and its official UMS value.
3. Type either a UMS score or a raw mark (leave the other blank) then press Convert.
4. The result panel shows the estimated converted value plus the method used (boundary segment or proportional).
5. Use Copy Link to generate a sharable URL containing your settings so others can replicate the calculation.

Swap quickly toggles directions. Reset restores a clean grade boundary list. Empty boundary rows are ignored to keep calculations exact.

Tips & Good Practice

Always verify high‑stakes results with official board documentation; this tool provides informed estimates only. Add more boundary points (e.g., every grade) to increase local accuracy. If you lack full grade data, entering just the top, midpoint, and pass threshold still improves realism versus naive global scaling. Watch for unrealistic slopes: if one boundary pair is reversed or equal, correct it to avoid zero or negative gradients. You can bookmark or share a preconfigured link before an exam session so students can experiment with “what if” scenarios without editing numbers repeatedly. Finally, remember that boundaries shift every session—update them as soon as new tables are published.

This tool is meant to be friendly and simple. You do not need to be a data expert. Type numbers you know; leave out what you do not. The calculator quietly ignores blank rows so you stay focused. If a result looks strange, read across your rows and check that raw marks rise as UMS rises. That simple scan catches most mistakes. You can clear and start again at any point without refreshing the page. Share the link with classmates so everyone works from the same assumed boundaries. This reduces confusion during revision chats. Because everything runs in your browser, nothing is stored on a server. You keep control of your data and can use the page offline after the first load. Treat the output as a guide, not a promise, and you will get the best value from it.