Use a product-selling-price-to-raw-material-cost ratio of about 2:1 to 3:1 as an early feasibility screen. If the projected payback period for the total capital investment is longer than five years, the ratio should generally be at least 2.0. For a shorter payback target of approximately three years, a ratio closer to 3.0 is more appropriate.

The shorter the required payback period, the greater the price-to-raw-material-cost ratio should be: use 2.0 as a minimum long-payback screen and target approximately 3.0 for a three-year payback.

How to Apply the Ratio

Use the ratio as an early screening metric

Calculate:

[ \text{Price-to-raw-material-cost ratio}

\frac{\text{Product selling price}}{\text{Raw material purchasing cost}} ]

The comparison should be made on a consistent per-unit-of-product basis, using the raw material cost required to produce that unit.

Match the ratio to the payback objective

For a process with a projected payback period exceeding five years, a ratio of 2.0 or higher is a reasonable initial threshold.

For a process intended to achieve payback in approximately three years, the target should ideally be around 3.0.

Use it before detailed process design

This ratio is most useful during early feasibility analysis, before committing substantial effort to detailed unit-operation design and full profitability modeling.

It helps determine whether the process has enough initial economic headroom to justify further engineering work.

Why the Ratio Matters

It provides room for costs beyond raw materials

Raw materials are only one component of total manufacturing economics. The selling price must also support the process’s capital investment, operating expenses, utilities, labor, maintenance, and other costs.

A low ratio can indicate that the process may not generate sufficient margin to recover its investment within the desired period.

It supports purchasing constraints

The ratio can be converted into an early purchasing requirement. For example, if the product selling price is known, the raw material purchasing cost must remain below approximately one-half of that price for a 2.0 ratio, or roughly one-third for a 3.0 ratio.

These limits help engineers identify whether the process depends on unusually favorable feedstock pricing.

It highlights exposure to market volatility

A process that only meets its target at today’s raw material price may become unattractive if feedstock prices increase.

Setting the ratio during feasibility analysis therefore creates an early warning threshold for raw material price changes.

Understanding the Trade-offs

The ratio is a screen, not a profitability model

A ratio of 2.0 or 3.0 does not prove that a process is profitable. It does not replace a complete analysis of capital cost, operating cost, product yield, capacity, taxes, financing, or market conditions.

It is a go/no-go indicator for deciding whether more detailed analysis is justified.

A higher ratio does not guarantee feasibility

A strong selling-price-to-raw-material-cost ratio can still be undermined by high capital requirements, difficult processing conditions, low plant utilization, or unfavorable operating costs.

The ratio should therefore be interpreted alongside the projected payback period and total capital investment.

Price assumptions require discipline

Both product selling prices and raw material purchasing prices can vary significantly. Using an optimistic product price or an unusually low feedstock price can make the ratio appear stronger than it is.

The ratio should be tested against realistic commercial assumptions and relevant price volatility.

How to Apply This to Your Project

Use the ratio as an initial economic gate before developing a detailed process model.

• If your primary focus is a payback period longer than five years: Require a product-selling-price-to-raw-material-cost ratio of at least 2.0 before advancing the concept.
• If your primary focus is a payback period of approximately three years: Target a ratio of approximately 3.0 to provide greater economic headroom.
• If your primary focus is raw material price risk: Set purchasing-cost limits that preserve the target ratio under plausible feedstock price increases.
• If your primary focus is final investment approval: Treat the ratio as an early screen, then confirm feasibility with a complete capital, operating-cost, and profitability analysis.

Applying the ratio consistently helps identify promising chemical processes early while avoiding false confidence from incomplete economics.

Summary Table:

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