CNC Machining calculator

Setup Time per Part Calculator

Spread a measured setup across the parts in the batch. The per-part setup time falls as the batch grows, because the total setup stays the same.

What this calculator does

  • Setup time per part when the total setup is spread across the batch, with a target gap.

Formula used

  • Setup time per part = total setup time ÷ batch quantity
  • Setup time per part in seconds = setup time per part × 60
  • Setup hours per batch = total setup time ÷ 60
  • Gap to target = setup time per part − target setup time per part

Inputs explained

  • Total Setup Time: Total setup time for the batch, measured at the machine.
  • Batch Quantity: Parts in the batch that absorb the setup.
  • Target Setup Time per Part: Setup time per part you are planning to achieve.

How to use the result

  • Best suited to sizing a batch for setup economy, comparing setup across two machines, checking setup time against a target.
  • Setup time varies with fixture, tool count, and operator skill. First article inspection waiting time is not counted here.

Current U.S. benchmarks

  • 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

  • Why does setup time per part fall as the batch grows? The setup total is fixed, so more parts share it. Doubling the batch halves the setup time each part carries, which is why lot size changes unit cost even when the cut time does not.
  • What counts as total setup time? Everything from the last good part of the previous job to the first good part of this one. Fixture changes, tool presets, offsets, program prove-out, and first article all belong.
  • Does this include programming time? Only if programmers or setup staff spend it during this setup. Offline programming belongs in a one-time adder, not in the recurring setup per part.
  • Can setup time per part drop without a bigger batch? Yes. Quick-change workholding, preset tooling, and standard offsets cut the numerator. That lowers the per-part setup even at the same batch quantity.

Last reviewed 2026-10-01.