How do you calculate the cost of a custom machine option?

Multiply the number of machines carrying the option by the option cost per machine, scale by the adoption or quote share, then add the fixed design and validation cost. With 6 machines at $18,500 each, 75% adoption, and $22,000 fixed, that is $83,250 variable plus $22,000, for $105,250 total.

What is non-recurring engineering on a custom option?

It is the one-time cost to design, prototype, and validate the option — engineering hours, test fixtures, and safety or regulatory sign-off — captured here as the fixed design and validation cost of $22,000. It is spent once regardless of how many machines ship with the option.

Why use an adoption or quote share percentage?

Not every machine in a run takes the option, and not every quote closes. The 75% share scales the per-machine cost to the machines that realistically carry it, so you amortize the fixed cost over a believable volume rather than the best case.

How should I price a custom option to a customer?

Take the total cost — $105,250 in the example — divide by the machines actually carrying it, then add target margin. Pricing only on per-machine cost ignores the $22,000 design and validation and erodes margin on low-volume options.

When is a custom option not worth offering?

When adoption is low and per-machine cost is high, the fixed design and validation cost cannot be amortized, so the effective cost per machine balloons. Run the share down toward your worst-case adoption before committing to the engineering.

What is the effective option cost per machine in the example?

The calculator reports a loaded per-machine figure of about $17,542, which spreads the adoption-weighted variable cost and fixed design cost back across the six machines — a useful number for setting list price.

Industrial Equipment, Machinery & Capital Goods calculator

Custom Option Cost Calculator

Custom Option Cost prices an engineered add-on to a machine — a special feed system, a vision upgrade, a hygienic washdown package — across the machines that will carry it. Sales engineers and product managers at machine builders use it to decide whether a custom option is worth quoting and how to amortize its one-time design and validation cost. The trap with custom options is the non-recurring engineering: a clever feature can look cheap per machine until the design, prototyping, and safety validation are counted. By splitting recurring per-machine cost from fixed design and validation, and scaling by how many customers actually adopt it, this calculator shows the true cost to carry the option in a quote.

What this calculator does

Estimate custom option cost from optioned machines, option cost per machine, option adoption share, and fixed design or validation cost.
Use it when pricing nonstandard guards, controls, tooling, motors, drives, sensors, documentation, or customer requested features.
It computes the total cost of a custom machine option by combining adoption-weighted per-machine cost with the fixed design and validation spend.

Formula used

Variable custom option cost = machines with the custom option × option cost per machine × option adoption or quote share
Total custom option cost = variable custom option cost + fixed option design and validation cost

Inputs explained

Machines with the custom option:
Option cost per machine:
Option adoption or quote share:
Fixed option design and validation cost:

How to use the result

Use it when deciding whether to offer an engineered option, setting its price, or amortizing non-recurring engineering across a build run.
It assumes a single per-machine cost and one design-and-validation total, so it does not model learning-curve savings as build volume rises or recurring re-validation across revisions.

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.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate the cost of a custom machine option? Multiply the number of machines carrying the option by the option cost per machine, scale by the adoption or quote share, then add the fixed design and validation cost. With 6 machines at $18,500 each, 75% adoption, and $22,000 fixed, that is $83,250 variable plus $22,000, for $105,250 total.
What is non-recurring engineering on a custom option? It is the one-time cost to design, prototype, and validate the option — engineering hours, test fixtures, and safety or regulatory sign-off — captured here as the fixed design and validation cost of $22,000. It is spent once regardless of how many machines ship with the option.
Why use an adoption or quote share percentage? Not every machine in a run takes the option, and not every quote closes. The 75% share scales the per-machine cost to the machines that realistically carry it, so you amortize the fixed cost over a believable volume rather than the best case.
How should I price a custom option to a customer? Take the total cost — $105,250 in the example — divide by the machines actually carrying it, then add target margin. Pricing only on per-machine cost ignores the $22,000 design and validation and erodes margin on low-volume options.
When is a custom option not worth offering? When adoption is low and per-machine cost is high, the fixed design and validation cost cannot be amortized, so the effective cost per machine balloons. Run the share down toward your worst-case adoption before committing to the engineering.

Last reviewed 2026-05-12.