Machining Time Estimator

Formula

• Turning/drilling: t = L / (N × f) × passes
• Milling: t = (L + approach) / V_f × passes

About this calculator

Part of our Machining & CNC Calculators collection. Cutting speed, feeds, RPM, cycle time, and tap drill charts.

How it works

Turning and drilling time equals cut length divided by feed rate, where feed rate is RPM times feed per revolution. Milling uses table feed plus approach distance per pass. Multiply by number of passes or holes for total cycle time.

Enter your values in the inputs above and click CALCULATE. Results appear on the right without a page reload. No login and no server upload.

Worked example

Turning 120 mm length at 800 RPM, 0.2 mm/rev, one pass.

1. Feed rate = 800 × 0.2 = 160 mm/min
2. Time = 120 / 160 = 0.75 min = 45 s

Result: 45 seconds cycle time, feed rate 160 mm/min.

When to use

• Quick cycle time for a single turning or drilling operation
• Estimating milling path time with approach distance
• Scaling time for multiple passes or holes

Limitations

• Constant feed and speed; no acceleration or dwell
• Milling mode ignores RPM (uses table feed directly)
• Does not include tool change or rapid moves

FAQ

Which operation mode should I pick?

Turning and drilling use RPM × mm/rev. Milling uses programmed table feed in mm/min plus approach length per pass.

How do passes work for drilling?

Enter number of holes as passes. Time = (depth / feed rate) × number of holes.

Is this the same as the CNC cycle time calculator?

This tool covers one cutting operation. The CNC cycle time tool adds rapids, tool changes, setup, and batch quantity.