CPM to DPM Calculator
Convert CPM (counts per minute) to DPM (disintegrations per minute) using detector efficiency. Includes a copy-ready summary and optional AI insights.
This calculator uses CPM = counts per minute and DPM = disintegrations per minute (radiation counting). If you meant DPM = denier per meter (textiles), this is not the right tool. Background subtraction is not included by default.
Enter efficiency as a percentage (0–100). Efficiency is detector + isotope + geometry specific.
Mode
CPM → DPM
DPM
4,800
Formula
DPM = CPM / (efficiency/100)
Assumptions
Assumptions: Efficiency is a percent for your specific detector/isotope/setup. This calculator does not subtract background CPM. If needed: DPM = (CPM_sample − CPM_background) / (efficiency/100). Use as a calculation aid, not as safety guidance.
Get practical guidance based on your inputs and assumptions.
Authoritative explanations of CPM, DPM, efficiency, and background correction:
Explore other quick calculators on MDZ.ai.
Features
Two-way conversion
Convert CPM → DPM or DPM → CPM with the same efficiency input.
Efficiency-aware
Uses detector efficiency (%) and highlights why it must match your setup.
Copyable summary
Copy mode, inputs, result, formula, and assumptions for lab notes.
Optional AI insights
Get practical interpretation and pitfalls (with graceful fallback when AI is unavailable).
How it works
Pick a direction
Choose CPM → DPM (default) or reverse: DPM → CPM.
Enter efficiency
Provide detector efficiency as a percentage (0–100), measured for your isotope/setup.
Copy and document
Copy a clean summary and document assumptions (including background handling).
FAQ
Convert CPM and DPM in seconds
Enter CPM/DPM and your detector efficiency to get a quick, documented conversion.
Use calculatorDisclaimer: This page is a calculator, not radiation safety guidance. Results depend on correct detector efficiency and your lab SOP. Background subtraction is not applied by default.