How do you calculate material shrinkage throughput?

Divide finished output by runtime for the raw hourly rate, then multiply by the yield. With 1,200 units over 8 hours the raw rate is 150 units/hr, and at 90% yield the effective throughput is 135 units/hr.

What is a good shrinkage yield for foundry castings?

It depends heavily on alloy and geometry, but many stable production lines run 88-95% effective yield after solidification shrinkage and scrap. Below about 85% you likely have a gating, feeding, or drying problem worth investigating.

What is the difference between raw and effective throughput here?

Raw throughput is finished pieces divided by runtime before losses; effective throughput applies the shrinkage yield. The gap — 150 vs 135 units/hr in the example — is the capacity you should not promise to customers.

Does this account for solidification shrinkage in metal castings?

Indirectly. The yield percentage absorbs solidification and drying shrinkage plus dimensional-reject scrap. It quantifies the net effect on usable output rather than modelling the metallurgy of any single pour.

How does runtime affect the result?

Runtime is the divisor for raw throughput, so a longer run over the same finished output lowers the hourly rate. In the example, 1,200 units over 8 hours gives 150 units/hr; the same output over 10 hours would give 120 units/hr.

Why not just use finished output directly?

Finished output is a total, not a rate, and it does not separate the shrinkage loss you should exclude from capacity planning. This tool turns it into an hourly effective figure you can schedule against.

Refractories, Furnace Linings & Foundry Consumables calculator

Material Shrinkage Calculator

Material Shrinkage estimates the effective hourly throughput of a foundry or refractory casting line after accounting for the volume lost when a casting or a refractory shape shrinks and consolidates as it solidifies, dries, and sinters. It takes finished output over runtime to get a raw rate, then multiplies by a yield percentage that captures shrinkage-driven scrap and dimensional loss. Foundry planners and refractory shape producers use it to set realistic production commitments, because the pattern or mould always dispenses more material than ends up as a usable, dimensionally-sound part. Ignoring shrinkage overstates capacity and leads to missed delivery dates on precast shapes and metal castings alike.

What this calculator does

Material Shrinkage estimates the effective hourly throughput of a foundry or refractory casting line after accounting for the volume lost when a casting or a refractory shape shrinks and consolidates as it solidifies, dries, and sinters.
Use it when material shrinkage in refractories, furnace linings and foundry consumables is being committed and you need a throughput number you can defend.
It divides finished output by runtime for a raw hourly throughput, then multiplies by the shrinkage yield to give effective usable throughput per hour.

Formula used

Raw material shrinkage = completed output ÷ runtime
Effective material shrinkage = raw throughput × efficiency

Inputs explained

Finished castings or lining pieces produced:
Production or cure runtime:
Effective yield after shrinkage losses:

How to use the result

Use it when planning realistic output rates for a casting or precast refractory line where solidification and drying shrinkage reduce usable yield.
A single yield figure blends solidification shrinkage, drying loss, and reject scrap; it will not tell you which loss dominates or predict shrinkage on a part geometry you have not run before.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The U.S. has 3,569 primary metal manufacturing establishments employing about 354,911 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate material shrinkage throughput? Divide finished output by runtime for the raw hourly rate, then multiply by the yield. With 1,200 units over 8 hours the raw rate is 150 units/hr, and at 90% yield the effective throughput is 135 units/hr.
What is a good shrinkage yield for foundry castings? It depends heavily on alloy and geometry, but many stable production lines run 88-95% effective yield after solidification shrinkage and scrap. Below about 85% you likely have a gating, feeding, or drying problem worth investigating.
What is the difference between raw and effective throughput here? Raw throughput is finished pieces divided by runtime before losses; effective throughput applies the shrinkage yield. The gap — 150 vs 135 units/hr in the example — is the capacity you should not promise to customers.
Does this account for solidification shrinkage in metal castings? Indirectly. The yield percentage absorbs solidification and drying shrinkage plus dimensional-reject scrap. It quantifies the net effect on usable output rather than modelling the metallurgy of any single pour.
How does runtime affect the result? Runtime is the divisor for raw throughput, so a longer run over the same finished output lowers the hourly rate. In the example, 1,200 units over 8 hours gives 150 units/hr; the same output over 10 hours would give 120 units/hr.

Last reviewed 2026-05-12.