Engineering Calculators & Tools for Manufacturing

Use our free engineering calculators to estimate machining parameters, material weight, tolerances, and more. Designed for engineers, designers, and buyers working with CNC machining.

CATEGORY 1：Unit Conversion Tools

  • mm to inches
  • kg to lbs
  • mm ↔ cm ↔ m
  • Ra ↔ Rz
  • Hardness (HRC / HB / HV)

CATEGORY 2：Material & Weight Calculators

  • Metal Weight Calculator
  • Density Calculator
  • Round Bar Weight
  • Pipe Weight
  • Sheet Metal Weight
  • Coil Weight

CATEGORY 3：CNC Machining Calculators

  • Feeds & Speeds
  • RPM ↔ Cutting Speed
  • Chip Load
  • MRR
  • Machining Time
  • Surface Finish

CATEGORY 4：Design & Engineering Calculators

  • Tolerance / Fit
  • Press Fit
  • Tap Drill
  • Hole Size
  • GD&T

CATEGORY 5：Material Selection & Data Tools

  • Material Grade Finder
  • Alloy Comparison
  • PREN Calculator
  • Pipe Schedule