CNC Machining calculator

Cutting Time vs Non-Cutting Time Calculator

Use this calculator to understand whether cycle time is dominated by cutting, rapids, tool changes, probing, pallet moves, or operator interaction. It helps teams decide whether optimization should focus on feeds and speeds or non-cutting losses.

What this calculator does

  • Compare cutting minutes with total CNC cycle minutes to show how much of the program is actually removing material.
  • measuring the cutting-time share of a CNC program or production cycle
  • The result shows whether improving feed rates alone will meaningfully improve cycle time.

Formula used

  • Cutting-time share = cutting time ÷ total CNC cycle time × 100
  • Gap to target = cutting-time share - target cutting-time share

Inputs explained

  • cutting time: Include only feed-controlled moves where the tool is removing material.
  • total CNC cycle time: Include cutting, rapids, tool changes, probing, pallet moves, dwell, load/unload, and other cycle elements in scope.
  • target cutting-time share: Use an internal target or benchmark for similar parts, machines, and setup complexity.

How to use the result

  • Use it when optimizing CNC programs, reducing non-cutting moves, or prioritizing setup and automation improvements.
  • Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.

Common questions

  • What is the cutting time vs non-cutting time calculator for? It measures the percent of cycle time spent cutting versus not cutting.
  • What information should I enter? Use cutting minutes, total cycle minutes, and a realistic target for comparable parts.
  • What does the result tell me? The result shows whether improving feed rates alone will meaningfully improve cycle time.
  • When is the result only an estimate? Treat the result as a planning estimate until it is verified against the actual CNC program, machine limits, toolholder rigidity, coolant delivery, workholding, material condition, inspection data, and shop-floor trial results.

Last reviewed 2026-05-12.