Machinist Calculators
Free, professional-grade tools for metalworking calculations. Based on Machinery's Handbook formulas and real-world shop experience.
MILLING & TURNING
Speeds & Feeds Calculator
The most comprehensive free S&F calculator online. 60+ materials, HSM chip thinning, tool deflection warnings, power requirements, and more.
- 60+ material presets with SFM ranges
- HSM chip thinning compensation
- Tool deflection warnings
- Spindle power requirements
- Shop rules integration
Stock Yield Calculator
Optimize blanks from bar stock. Minimize waste and maximize yield from your raw material.
- Calculate parts per bar
- Minimize material waste
- Cost per part analysis
Square Diameter Calculator
Calculate the largest square that fits in a round shaft, or required shaft diameter for a given square dimension.
- Round to square conversion
- Square to round conversion
- Visual diagram with waste area
- Inches and metric support
Hexagon Diameter Calculator
Calculate the largest hexagon that fits in a round shaft, or required shaft diameter for a given hexagon dimension.
- Round to hexagon conversion
- Hexagon to round conversion
- Visual diagram with waste area
- Inches and metric support
Bolt Circle Calculator
Calculate Cartesian coordinates for bolt circles with up to 100 holes. Can solve for unknown BC, HD, or MD.
- Up to 100 holes supported
- Solve for BC, HD, or MD
- Cartesian & D.R.O. modes
- Visual diagram & coordinates table
DRILLING & TAPPING
Drill Point Depth Calculator
Calculate blind hole depths accounting for drill point geometry. Never bottom out a drill again.
- Standard & split-point angles
- Visual drill diagram
- Common drill size presets
- Shop rules warnings
Thread Depth Calculator
Calculate minimum thread engagement for tapped holes. Based on Machinery's Handbook standards for bolt/hole material pairs and safety factors.
- UNC, UNF, Metric threads
- Material strength ratios
- Application type presets
- Visual engagement diagram
GEOMETRY & TRIGONOMETRY
Right Triangle Calculator
Solve right triangles from any two known values. Live visual diagram with hover tooltips shows all dimensions.
- Solves from any 2 inputs
- Imperial/Metric toggle
- Decimal & DMS angles
- Interactive SVG diagram
Sine-Bar Calculator
Calculate angle/height relationships for sine bar setups. Used for precision angle measurement in layout tables and milling vises.
- Solve for angle or height
- Inches/millimeters toggle
- Decimal & DMS angles
- Visual sine bar diagram
Chord Length Calculator
Calculate circle segment and chord relationships for keyways, circular features, and arc machining operations.
- Solve from R/D + one parameter
- Angle, chord, height, arc length
- Inches/millimeters toggle
- Visual circle segment diagram
MEASUREMENT & CONVERSION
Tolerance Stack-Up Calculator
Worst-case and statistical (RSS) tolerance analysis for assemblies with multiple dimensions.
- Worst-case analysis
- RSS statistical method
- Dynamic dimension list
- Visual stack diagram
Surface Finish Converter
Convert between Ra, Rz, RMS, and ISO N-grade surface finish specifications.
- Ra, Rz, RMS, N-grade
- Microinch/micrometer units
- ISO 1302 standards
- Surface profile diagram
REFERENCE & LEARNING
G-Code & M-Code Reference
Complete searchable reference for G-codes and M-codes. Includes usage examples, notes, and machine compatibility.
- 50+ G-codes and M-codes
- Search and filter functionality
- Mill and lathe compatibility
- Usage examples for each code
CNC Programming Basics
Complete beginner's guide to CNC programming. Learn G-code, M-code, coordinate systems, and program structure.
- Coordinate systems explained
- Canned cycles for drilling
- Complete program examples
- Safety and best practices
Need More Reference Data?
Machinery's Handbook has every formula, chart, and table a machinist needs. The 31st edition is the latest.