CNC Machinist Calculator

CNC Machinist Calculator — speeds & feeds, power, fits, tool life and G-code in your pocket. Works offline.

Enter a tool and a material and get spindle RPM, feed rate, cut time and machine power in one second — metric or inch, with the formula and its source shown under every result.

Free, no limits, no ads

Milling, Drilling and Turning Speed & Feed
Drill size and tap drill charts (letter, number, metric, fractional)
G- and M-code reference with examples

Pro — 7-day free trial on the yearly plan

Milling, Drilling and Turning Power & Torque (MRR, kW/hp, N·m)
Tolerance & Fit — ISO 286 limits and deviations from the standard tables, with inch display per ANSI B4.2
Turning Surface Roughness, Thread Milling with centre-line feed compensation
Tool Life (Taylor), Coolant Flow & Nozzle, Ball-nose Step-over
Chip Load & Deflection — HSM chip thinning, cutting forces, bending stress, chatter risk
Cycle Time & Cost — cost per part from cutting time, setup, batch size, tool cost and shop rate
G-code generators: bolt circle, grid, linear pattern, 3-point arc — safe Fanuc-style header, Z clearance, G81/G82/G83
Machine profile — results capped to your spindle's RPM, power and feed
Tool library and your own materials with personal Vc, fz and kc
Setup-sheet history, export to CSV and PDF

Materials done properly
38 workpiece materials in ISO groups P/M/K/N/S/H — steels, stainless, cast iron, aluminium, brass, plastics, titanium, Inconel, hardened steel — each with separate starting values for HSS and carbide, specific cutting force kc, and coating factors (TiN, TiCN, TiAlN, AlCrN, DLC) with warnings when a coating does not suit the material.

Built on real formulas
Machinery's Handbook speeds and feeds, ISO 286-1/2 tolerance tables, ISO 68-1 thread geometry, Qu & Shih circular-cusp Ra, Taylor tool life, Bernoulli nozzle flow. The engine is covered by 200+ automated tests. Catalogue values are starting points — always confirm with your insert maker's data.

Pricing
Pro Monthly $1.99/month, Pro Yearly $7.99/year, or Lifetime $14.99 one-time. Subscriptions are charged to your Apple ID and renew automatically unless cancelled at least 24 hours before the end of the current period; manage them in Settings. Existing Remove Ads buyers keep full Pro.

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