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Crusher Reduction Ratio Calculator
Calculate F80/P80 reduction ratio and particle-size reduction from consistent feed and product size measures.
Crusher Reduction Ratio Calculator
FREE ONLINE TOOLSTEP BY STEP
How to use crusher reduction ratio calculator
- Check the input units and assumptions.
- Review the result and example.
IN PRACTICE
Example
F80 = 150 mm; P80 = 25 mm → RR = 6:1; size reduction = 83.33%.
GOOD TO KNOW
Is P80 the closed-side setting?
No. P80 is a measured product-size statistic. Closed-side setting is a machine adjustment and may influence the distribution without equaling P80.
Formula and worked example
RR = F80/P80; size reduction (%) = 100(1 − P80/F80).
F80 = 150 mm; P80 = 25 mm → RR = 6:1; size reduction = 83.33%.
How to interpret the result
A 6:1 ratio describes this pair of size statistics. It does not imply every particle becomes six times smaller or that the machine will maintain the same ratio under every feed condition.
Changing ore hardness, moisture or feed distribution can alter product size. Compare ratios with throughput and product specification rather than using the highest ratio as a goal.
Frequently asked questions
Is P80 the closed-side setting?
No. P80 is a measured product-size statistic. Closed-side setting is a machine adjustment and may influence the distribution without equaling P80.
What assumptions limit this calculation?
A size-ratio calculation, not equipment selection or power prediction. F80 must be at least P80 for a reduction process. Maximum-lump ratios use a different basis and should not be compared directly.
How to Calculate Crusher Reduction Ratio: Formula & Example