Definition
An estimator (calculator) is the role responsible for pre-calculation: turning a part's requirements, routing and factory rates into a cost estimate and, typically, a quoted price. In many shops this role overlaps with or is closely paired with a work preparer, since an accurate estimate depends on a realistic routing.
Why estimating and work preparation are closely linked
An estimator's accuracy depends heavily on the quality of the underlying routing and rate data they work from, which is why estimating and work preparation are often done by the same person or in close coordination, rather than in isolation.
Where an estimator's output goes
Not on the drawing; the estimator reads the drawing, requirements and routing to produce a cost estimate and quote, rather than appearing in the technical documentation.
Common mistakes
Estimating a part's cost without a realistic routing behind it, producing a price based on optimistic or generic assumptions that post-calculation later reveals to be wrong.
An estimator's accuracy depends heavily on the quality of the underlying routing and rate data they work from, which is why estimating and work preparation are often done by the same person or in close coordination, rather than in isolation.
See how Blake reviews a partFrequently asked questions
Is an estimator the same as a work preparer?
Roles often overlap, especially in smaller shops; an estimator focuses on cost and price, a work preparer on the concrete routing those numbers depend on.
What does an estimator need from a work preparer?
A realistic routing: which operations, machines and setups the part actually requires, which the cost estimate is built on.
How does an estimator's work get checked?
Through post-calculation, comparing the original estimate against what a part actually cost to produce.