Does a stopped spindle still cost money?

Yes. Labor, machine ownership, and overhead keep accruing while the machine waits, so every stopped minute carries the burden rate even though the tool is not cutting.

What belongs in the burden rate?

The machine-hour cost your quotes use, covering ownership, labor, overhead, and support. Using the same rate keeps the downtime figure comparable with production cost.

How does a tool presetter reduce this cost?

Presetting moves the touch-off work off the machine. If a change drops from 4.5 to 4 minutes, the saved half minute per change multiplies by the batch's tool changes and the burden rate.

Why is the per-change cost the same every time?

It depends only on the minutes a change takes and the burden rate. Total cost scales with the number of changes, which is why the batch count drives the headline.

CNC Machining calculator

Tool Change Time Cost Calculator

Price the downtime a batch spends changing tools. Enter the number of changes, the minutes each change takes, and the burden rate the stopped machine carries.

What this calculator does

Cost of the production time a batch loses to tool changes, priced at the machine and labor burden rate.

Formula used

Tool-change downtime = tool changes per batch × minutes per tool change
Tool-change time cost = downtime minutes ÷ 60 × machine and labor burden rate
Cost per tool change = minutes per tool change ÷ 60 × burden rate
Burden cost per minute = burden rate ÷ 60
Gap to target = downtime minutes − target downtime

Inputs explained

Tool Changes per Batch: Tool changes the batch program calls for.
Minutes per Tool Change: Minutes lost from the last cut to the next cut.
Machine and Labor Burden Rate: Hourly machine and labor cost while stopped.
Target Tool-Change Downtime: Downtime minutes the batch should stay under.

How to use the result

Best suited to costing a tool-heavy cycle, setting a tool-change target, justifying a tool presetter.
Rapid moves inside a tool change are already in the cycle. Tool life and the number of changes come from the program.

Current U.S. benchmarks

As of Sep 2026, average hourly earnings in U.S. manufacturing are $30.21 (BLS), up 3.4% from a year earlier. Burdened shop rates typically run 1.3 to 1.8 times earnings once benefits and overhead are loaded.
The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 17,154 machine shops establishments employing about 223,303 workers (Census County Business Patterns, 2023).

Common questions

Does a stopped spindle still cost money? Yes. Labor, machine ownership, and overhead keep accruing while the machine waits, so every stopped minute carries the burden rate even though the tool is not cutting.
What belongs in the burden rate? The machine-hour cost your quotes use, covering ownership, labor, overhead, and support. Using the same rate keeps the downtime figure comparable with production cost.
How does a tool presetter reduce this cost? Presetting moves the touch-off work off the machine. If a change drops from 4.5 to 4 minutes, the saved half minute per change multiplies by the batch's tool changes and the burden rate.
Why is the per-change cost the same every time? It depends only on the minutes a change takes and the burden rate. Total cost scales with the number of changes, which is why the batch count drives the headline.

Last reviewed 2026-10-02.