How do you calculate rare earth cost sensitivity?

Multiply rare earth mass by price per kilogram by the assumed price move percentage, then add the fixed non-RE material cost. With 1,200 kg at $75/kg, a 30% swing exposure, plus $15,000 base cost, the total exposure is $42,000.

What counts as the variable versus fixed portion?

The variable portion is the price-exposed rare earth spend — here $27,000, driven entirely by the 1,200 kg of RE at $75/kg times the 30% move. The fixed portion is the $15,000 non-RE bill of materials that does not track rare earth prices.

What is the cost per unit in this example?

The tool divides total exposure by the rare earth mass, giving $35 per kilogram of rare earth content ($42,000 / 1,200 kg). That per-unit figure is useful when you want to compare exposure across parts of different sizes.

Why use a price move percentage instead of a new price?

A percentage lets you stress-test symmetric best- and worst-case moves quickly. A 30% input models a plausible quarterly NdPr swing without you having to look up a specific future price, which is ideal for scenario planning.

Is a high rare earth cost sensitivity always bad?

Not inherently, but it means margin is fragile. If more than half your exposure is variable — as in this example where $27,000 of $42,000 is price-driven — a single price spike can erase your quote margin, so it is a strong signal to hedge or index the contract.

How can I reduce rare earth cost sensitivity?

Cut RE mass through grain-boundary diffusion to lower dysprosium loading, index the sales price to a published rare earth benchmark, hedge, or qualify a lower-RE grade. Each move shrinks the variable portion relative to the fixed non-RE cost.

Rare Earth Magnet & Motor Materials calculator

Rare Earth Cost Sensitivity Calculator

Rare earth cost sensitivity measures how much of your magnet or motor cost is exposed to a move in neodymium, praseodymium, or dysprosium prices. Sourcing managers and cost engineers at motor OEMs and magnet fabricators use it to size the dollar risk hiding in a spot-priced BOM before signing a fixed-price supply agreement. Because NdPr oxide can swing 30% or more in a single quarter, a magnet program that looks profitable at today's price can go underwater fast. This tool separates the price-exposed rare earth spend from the stable, non-RE portion of the build so you can see exactly where the volatility lives.

What this calculator does

Estimates how a rare earth price swing changes program material cost from RE mass, current price, and the modeled percentage move.
Use it to stress-test motor or magnet material budgets against neodymium or dysprosium price volatility.
It calculates the dollar cost exposure created when your rare earth mass is repriced by a given percentage move, then adds the fixed non-RE material cost to give a total.

Formula used

Cost exposure = rare earth mass x price per kg x price move% + base non-RE material cost
Exposure per kilogram of RE = cost exposure / rare earth mass

Inputs explained

Rare Earth Content per Batch:
NdPr Oxide Price per Kilogram:
Assumed Price Swing Exposure:
Base Non-RE Bill of Materials:

How to use the result

Use it during supplier negotiations, hedging decisions, or quarterly cost reviews when rare earth spot prices have shifted or a customer wants a firm quote.
It assumes a single blended rare earth price and a symmetric percentage move; it does not model separate Nd, Pr, and Dy price curves or hedged tranches, so treat it as a first-pass exposure screen, not a full mark-to-market.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
The U.S. has 5,397 electrical equipment and appliances establishments employing about 369,437 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate rare earth cost sensitivity? Multiply rare earth mass by price per kilogram by the assumed price move percentage, then add the fixed non-RE material cost. With 1,200 kg at $75/kg, a 30% swing exposure, plus $15,000 base cost, the total exposure is $42,000.
What counts as the variable versus fixed portion? The variable portion is the price-exposed rare earth spend — here $27,000, driven entirely by the 1,200 kg of RE at $75/kg times the 30% move. The fixed portion is the $15,000 non-RE bill of materials that does not track rare earth prices.
What is the cost per unit in this example? The tool divides total exposure by the rare earth mass, giving $35 per kilogram of rare earth content ($42,000 / 1,200 kg). That per-unit figure is useful when you want to compare exposure across parts of different sizes.
Why use a price move percentage instead of a new price? A percentage lets you stress-test symmetric best- and worst-case moves quickly. A 30% input models a plausible quarterly NdPr swing without you having to look up a specific future price, which is ideal for scenario planning.
Is a high rare earth cost sensitivity always bad? Not inherently, but it means margin is fragile. If more than half your exposure is variable — as in this example where $27,000 of $42,000 is price-driven — a single price spike can erase your quote margin, so it is a strong signal to hedge or index the contract.

Last reviewed 2026-05-12.