Crusher Reduction Ratio
Enter feed size and product size to calculate crusher reduction ratio and classifier type.
Use the Crusher Reduction Ratio
Crusher Size Inputs
Top particle size entering the crusher
Target product size leaving the crusher
Typical Reduction Ratio Ranges
| Crusher Stage | Type | RR Range |
|---|---|---|
| Primary | Jaw / Gyratory | 3 – 8 |
| Secondary | Cone / Impact | 6 – 16 |
| Tertiary | Fine cone / VSI | 10 – 50 |
Enter feed and product sizes, then click Calculate.
Reduction Ratio
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Feed Size / Product Size
Crusher Stage Classification
Breakdown
Feed Size (F)
—
Product Size (P)
—
Reduction Ratio (RR = F/P)
—
Stage classification
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Bond Crushing Work Index Estimate
Uses W = Wi × 10 × (1/√P − 1/√F) with Wi = 10 kWh/t (generic hard rock). Replace Wi with your ore-specific value for design work.
Estimated energy (kWh/t)
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Note: feed and product sizes are treated as F80 and P80 for this estimate.
Summary
Enter feed size and product size to calculate crusher reduction ratio and classifier type.
How it works
- Enter the maximum feed particle size in millimeters or inches.
- Enter the target product size in the same unit.
- The tool divides feed size by product size to get the reduction ratio.
- It then classifies the ratio as primary (3–8), secondary (6–16), or tertiary (10–50) range.
- A Bond Work Index crushing estimate is shown as a supplemental reference.
Use cases
- Selecting the right crusher type for a given ore size reduction target.
- Verifying that a crusher circuit meets reduction ratio specifications.
- Estimating energy consumption via Bond crushing work index.
- Teaching mineral processing reduction ratio concepts.
Frequently Asked Questions
Last updated: 2026-09-20 ·
Reviewed by Nham Vu