CNC Machinist Calculators

CNC Machinist Calculators is a practical machining calculator and formula reference app for CNC operators, machinists, programmers, apprentices, students, and shop professionals.

Use a collection of CNC machining calculators to work with feeds, speeds, drilling, tapping, turning, milling, machining time, surface finish, geometry, material removal, and common shop math. The app is designed to make everyday machining calculations faster and easier while keeping the underlying formulas available for reference.

Features include:
- Feeds and speeds calculators
- Milling, turning, drilling, and tapping calculations
- Material removal rate and machining power estimates
- Machining time calculations
- Thread, taper, chamfer, and geometry tools
- Surface finish and stepover calculations
- Built-in formula guide with practical explanations
- Imperial and metric unit support

The feeds and speeds tools can calculate spindle RPM from cutting speed and diameter, cutting speed from RPM, milling feed rate from chip load and flute count, chip load, feed per revolution, and turning feed rate.

Material removal tools include milling and turning MRR calculations plus machining power estimates based on removal rate and unit power. These tools are useful for comparing cuts, estimating machine load, and planning roughing operations.

The app also includes machining-time tools, drilling calculations, tapping and thread conversions, turning geometry, taper calculations, surface-finish tools, scallop-height calculations, stepover calculations, chamfer geometry, and other common CNC shop math.

Each calculator shows the formula used and includes supporting notes to help explain the result. Selected calculators also include diagrams for easier visual reference.

The built-in Guide/Formulas section provides practical explanations for the available calculators, including what each formula does, how to use it, and where it can be useful in real machining work. You can search formulas and jump directly from a guide to the matching calculator.

Useful for:
- CNC milling
- CNC turning
- Manual machining reference
- CNC programming
- Tool setup and parameter checks
- Shop math
- Machining training and study
- Feed and speed planning
- Cycle-time estimates
- Surface-finish planning

CNC Machinist Calculators is intended as a planning, calculation, training, and reference tool. Always verify tooling, material data, machine limits, workholding, coolant requirements, tolerances, manufacturer recommendations, and shop procedures before machining a part or changing a production setup.