Injection Molding Clamping Force & Tonnage Calculator

Determine machine press clamping tonnage (US tons and metric tonnes), total projected parting line area, cavity pressure, and flash prevention margins.

Part Geometry & Mold Cavitation

Single Part Projected Area (in² or cm²):

Area Units:

Number of Mold Cavities (N):

Runner System Allowance (%): Hot runner = 0%; Cold runner = 10-20%

Polymer Resin & Average Cavity Pressure

Thermoplastic Material Preset:

Cavity Pressure P_cav (psi):

Tonnage Safety Factor (SF %): Standard practice: 10% to 20%

Required Machine Clamping Tonnage

Required Clamping Force (US Tons):

—

— Metric Tonnes (kN)

Recommended Machine Class:

—

With —% safety margin

Total Projected Mold Area:

— in²

—

Specific Clamping Index:

— tons/in²

Parting Line Flash Assessment:

—

Recommended Tools & Equipment

Tested hardware and components for high reliability

100% Free Tool Zero Sign-Up

Injection Molding Clamping Force & Tonnage Calculator

Part Geometry & Mold Cavitation

Polymer Resin & Average Cavity Pressure

Required Machine Clamping Tonnage

Frequently Asked Questions