Foundry & Forging calculator

Forging Tonnage Calculator

Estimate forging force from projected area and approved average die pressure, then check your press loading limit.

What this calculator does

  • Estimate forging force from projected area and approved average die pressure, then check your press loading limit.

Formula used

  • Forging force = projected contact area × approved average die pressure
  • US ton-force = forging force ÷ 2,000 lbf
  • Press load = forging tonnage ÷ available press force × 100
  • Planned force limit = available press force × maximum planned load ÷ 100
  • Headroom = planned force limit − estimated forging force

Inputs explained

  • Projected Contact Area: Peak-load projected contact area from the forging model.
  • Approved Average Die Pressure: Validated model or load-trial pressure including friction and geometry.
  • Available Press Force: Rated force at the planned working stroke position.
  • Maximum Planned Press Load: Approved operating fraction of available press force.

How to use the result

  • Best suited to a lower press loading limit is Exceeded, a higher approved limit adds headroom.
  • Does not qualify die stresses, eccentric loading, press energy or stroke capacity. A hammer energy rating cannot substitute for press force.

Current U.S. benchmarks

  • The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
  • The U.S. has 3,569 primary metal manufacturing establishments employing about 354,911 workers (Census County Business Patterns, 2023).

Common questions

  • Can I enter material flow stress as pressure? Only if your validated model establishes that effective pressure. Friction and shape constraints usually change the required average die pressure.
  • Does projected area include flash? Include every loaded region represented by your average pressure model, including flash when that model includes it.
  • Which press rating belongs here? Use the force available at the planned stroke position, after the applicable equipment restrictions.
  • Can I use this for a forging hammer? No. Hammer energy and impact behavior require a separate model; a nominal tonnage label is insufficient.

Last reviewed 2026-10-06.