CNC Machining calculator

Drilling Cycle Time Calculator

Use this calculator to estimate machining minutes for drilling cycle time before releasing a CNC route, quote, or schedule. It separates cutting distance from feed rate and allowance so programmers can see whether time is driven by the toolpath, feed choice, or non-cutting motion.

What this calculator does

  • Estimate drilling cycle time from total drilled depth, feed rate, and allowance for pecking, retracts, spot drilling, or chip clearing.
  • estimating drilling cycle time for quoting, routing, capacity planning, or comparing alternate CNC programs
  • The result is the estimated minutes for that machining operation, including the selected allowance.

Formula used

  • Base drilling cycle time = total drilled depth ÷ drilling feed rate
  • Estimated drilling cycle time = base time × allowance factor

Inputs explained

  • total drilled depth: Use the total distance actually traveled in the cutting or feed-controlled portion of the operation.
  • drilling feed rate: Use the programmed feed for the operation after any process derating or override assumptions.
  • peck, retract, and chip-clearance allowance: Add allowance for entry, exit, tool changes tied to the operation, chip clearing, positioning, and minor machine delays.

How to use the result

  • Use it when quoting, programming, scheduling, or comparing alternate drilling strategies.
  • 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 drilling cycle time calculator for? It estimates operation time for drilling cycle time from distance, feed, and allowance.
  • What information should I enter? Use the relevant cut length or depth, feed rate in matching units, and an allowance that reflects the machine and program strategy.
  • What does the result tell me? The result is the estimated minutes for that machining operation, including the selected allowance.
  • 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.