Machining Time Calculator
Enter cut length, feed rate and passes to get cutting time, total cycle and parts per hour — the basis of every machining quote.
Last updated: 2026-09-28
How the calculation works
- Cutting time is path length times passes divided by feed — with a 5-second approach allowance per pass.
- Setup/handling joins the cycle for the parts-per-hour figure quotes depend on.
- For batch jobs, amortize dedicated setup across the batch size before quoting.
Formula
t_cut = L × passes ÷ F (+ 5 s approach per pass)
| Symbol | Meaning | Unit |
|---|---|---|
t | Machining time | min |
F | Feed rate | mm/min |
Worked example
Interpreting the result
Cycle time is money in machining: at shop rates of $60–120/h, every minute is $1–2 per part. Optimize the longest cut first — a feed increase on the main pass beats micro-optimizing rapids. The parts-per-hour figure is the quoting unit: multiply by your hourly rate, add material and tooling amortization, and the estimate holds up against real invoices.
Assumptions
- Single continuous cut per pass — multiple features need per-feature summation.
- 5 s per pass for approach/retract; rapid traverses excluded.
Limitations
- Tool changes, indexing and multi-feature programs add time not captured here.
- Accelerated/decelerated motion slightly lengthens short-segment cycles.
Frequently asked questions
How do I calculate machining cycle time?
Cut length × passes ÷ feed rate, plus tool changes and handling. A 200 mm cut at 300 mm/min takes 0.67 min per pass.
How do I quote a machined part?
Cycle time × machine rate + material + setup amortized over the batch + tooling allowance. The parts-per-hour here feeds the first term.