How do you calculate an expected prototype quote value?

Multiply prototype cost per unit by units requested for the gross value, then multiply by quote confidence and expected build yield. At $420/unit for 12 units, 85% confidence and 75% yield, gross is $5,040 and expected value is $3,213.

Why discount a prototype quote for build yield?

Prototypes fail more than production parts, fixtures are not proven, processes are not dialed in. At 75% yield, $1,071 of the gross value is at risk from build fallout, meaning you may scrap and rebuild units the customer still expects delivered.

What is prototype quote confidence?

It reflects how well the scope is defined, drawings, tolerances, and acceptance criteria. At 85%, $756 of the $5,040 gross value is at risk from unclear scope, the work that may expand once the customer clarifies intent.

What is a typical prototype build yield?

Prototype yields commonly run 60-85% versus 95%+ in mature production, because the process is not yet stable. Using a production yield assumption on a prototype is the fastest way to underprice it.

How is a prototype quote different from a production quote?

A production quote assumes frozen scope and stable yield; a prototype quote must carry risk for both. This is why expected value ($3,213) sits well below gross ($5,040), the difference is the risk you would otherwise eat.

Should I quote prototypes at expected value or gross?

Quote at or above gross when the customer accepts time-and-materials or pays for iterations; quote nearer expected value only when you can absorb the risk. The split shows exactly how much risk a fixed price would force you to carry, $1,827 total here.

Contract Manufacturing, Job Shop Quoting & Make-to-Order calculator

Prototype Quote Calculator

Prototype Quote risk-adjusts the value of a prototype build by discounting the gross quote for two realities of first-article work, that the scope is rarely fully defined and that prototype yields run well below production yields. Estimators and NPI engineers in make-to-order shops use it to set a prototype price that survives unclear specs and build fallout without bleeding margin. The metric splits the gross quote into expected value and the value at risk from unclear scope and from build yield, so you can see where the exposure sits before you commit. On real prototype work, where a single iteration can consume a full build, this prevents quoting a prototype as if it were a production run.

What this calculator does

Estimate prototype quote cost for a low-volume development build.
quoting prototypes, samples, development lots, or first articles before production pricing is known
It computes the expected value of a prototype quote by scaling the gross quote down for scope confidence and expected build yield, and reports the value at risk from each.

Formula used

gross prototype quote value before risk = prototype cost per unit × prototype units requested
expected prototype quote value = gross prototype quote value before risk × prototype quote confidence × expected prototype build yield

Inputs explained

Prototype cost per unit:
Prototype units requested:
Prototype quote confidence:
Expected prototype build yield:

How to use the result

Use it when quoting a prototype or first-article build where the design is not frozen and yields are uncertain, before you commit a fixed price.
It models scope and yield as single factors; a multi-iteration prototype program with escalating learning is better handled as staged builds, each quoted separately.

Current U.S. benchmarks

The U.S. prime lending rate is 6.75% (Federal Reserve via FRED, 2026-07-02). Payback and financing math should start from today's rate, not a remembered one.

Common questions

How do you calculate an expected prototype quote value? Multiply prototype cost per unit by units requested for the gross value, then multiply by quote confidence and expected build yield. At $420/unit for 12 units, 85% confidence and 75% yield, gross is $5,040 and expected value is $3,213.
Why discount a prototype quote for build yield? Prototypes fail more than production parts, fixtures are not proven, processes are not dialed in. At 75% yield, $1,071 of the gross value is at risk from build fallout, meaning you may scrap and rebuild units the customer still expects delivered.
What is prototype quote confidence? It reflects how well the scope is defined, drawings, tolerances, and acceptance criteria. At 85%, $756 of the $5,040 gross value is at risk from unclear scope, the work that may expand once the customer clarifies intent.
What is a typical prototype build yield? Prototype yields commonly run 60-85% versus 95%+ in mature production, because the process is not yet stable. Using a production yield assumption on a prototype is the fastest way to underprice it.
How is a prototype quote different from a production quote? A production quote assumes frozen scope and stable yield; a prototype quote must carry risk for both. This is why expected value ($3,213) sits well below gross ($5,040), the difference is the risk you would otherwise eat.

Last reviewed 2026-05-12.