Speeds & Feeds.
CNC milling calculator. Compute spindle RPM, feed rate, chip load per tooth, material removal rate (MRR), and required spindle horsepower from cutting parameters.
Auto-loads typical SFM and chip load for HSS / carbide
mm — end mill diameter
m/min — auto-set by material; override if needed
mm/tooth — feed per tooth
mm — depth of cut
mm — width of cut
SPINDLE SPEED
—
RPM
FEED RATE
—
mm/min
MRR
—
Cutting force (Fc est.)
—
Spindle power (kW)
—
Spindle power (HP)
—
n (RPM) = 1000 × Vc / (π × D)
Vf (mm/min) = n × Z × fz
MRR (cm³/min) = ap × ae × Vf / 1000
P (kW) = MRR × Kc / 60000
Vf (mm/min) = n × Z × fz
MRR (cm³/min) = ap × ae × Vf / 1000
P (kW) = MRR × Kc / 60000
Typical surface speed reference (Vc, m/min)
| Material | HSS | Carbide | Coated carbide | Typical fz (mm) |
|---|---|---|---|---|
| Aluminium 6061 / 7075 | 120–180 | 400–700 | 500–1000 | 0.05–0.15 |
| Brass / bronze | 60–90 | 150–300 | 200–400 | 0.05–0.12 |
| Cast iron — gray | 20–35 | 80–150 | 120–200 | 0.10–0.20 |
| Mild steel (1018, EN8) | 25–35 | 100–180 | 150–280 | 0.05–0.15 |
| Alloy steel (4140, EN24) | 15–25 | 80–120 | 120–200 | 0.05–0.12 |
| Stainless 304 | 15–25 | 60–100 | 100–180 | 0.04–0.10 |
| Stainless 316 | 12–20 | 50–90 | 80–150 | 0.04–0.10 |
| Titanium Ti-6Al-4V | 8–15 | 30–60 | 50–100 | 0.03–0.08 |