Tapping Feed Rate Calculator

Inputs

Spindle speed (n)

rpm

Thread pitch (P)

Default result

Tapping feed rate(Vf)

500mm/min

Feed rate the tap (and Z axis) must run at — Vf = n × P.

Also computed

Feed per revolution(fr)1mm

equals pitch

Equals the thread pitch — the tap advances one pitch per rev.

Method notes 3 notes

Tapping feed rate Vf = spindle speed n × thread pitch P. The feed per revolution equals the pitch exactly — the tap cuts its own lead, so the feed is not chosen freely.
For inch taps, convert the pitch first: P = 25.4 ÷ TPI (e.g. 20 TPI → 1.27 mm pitch). Then Vf = n × P as usual.
On retract the tap reverses out at the same feed rate Vf, so the rapid-out feed must equal the feed-in — rigid tapping handles this automatically.