Rosin Press PSI Calculator: Platen Area vs True Bag Footprint Pressure
To calculate true rosin bag PSI, multiply your press ram force in tons by 2,000 to get pounds of force, then divide by the length times width of your micron filter bag in square inches rather than platen area.
Interactive Rosin Platen & Bag Footprint PSI Calculator
Calculate both Platen-Level PSI and True Bag-Level PSI. Hydraulic gauge pressure is NOT bag PSI: a 10-ton press on a 2x4 inch bag delivers 2,500 PSI at the mesh, which will cause an instant blowout unless throttled.
Standard Rosin Bag Footprint vs Hydraulic Tonnage Reference Table
| Bag Size (Inches) | Bag Footprint Area | Ideal Flower Force (850 PSI) | Ideal Dry Sift Force (550 PSI) | Ideal Bubble Hash Force (400 PSI) | Recommended Platen Size |
|---|---|---|---|---|---|
| 1.75 x 3.0 in (Bottle-Tech) | 5.25 sq in | 2.23 Tons (4,462 lbs) | 1.44 Tons (2,887 lbs) | 1.05 Tons (2,100 lbs) | 2.5x2.5 or 3x5 in |
| 2.0 x 4.0 in (Standard 7g) | 8.00 sq in | 3.40 Tons (6,800 lbs) | 2.20 Tons (4,400 lbs) | 1.60 Tons (3,200 lbs) | 3x5 in |
| 2.0 x 4.5 in (Standard 10g) | 9.00 sq in | 3.83 Tons (7,650 lbs) | 2.48 Tons (4,950 lbs) | 1.80 Tons (3,600 lbs) | 3x5 or 4x6 in |
| 2.5 x 4.5 in (Hash / 14g Flower) | 11.25 sq in | 4.78 Tons (9,562 lbs) | 3.09 Tons (6,187 lbs) | 2.25 Tons (4,500 lbs) | 3x5, 4x6, or 4x7 in |
| 3.0 x 6.0 in (Commercial 28g) | 18.00 sq in | 7.65 Tons (15,300 lbs) | 4.95 Tons (9,900 lbs) | 3.60 Tons (7,200 lbs) | 4x7 in (10T - 20T Press) |
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