Metalworking Calculators
Free metalworking calculators for welding rod estimates, metal weight, cutting speeds, and more.
Tools for welders, machinists, and fabricators.
Weld Filler Metal Weight Calculator
Estimate the weight of filler metal needed for a weld joint by joint type, plate thickness, and weld length. Accounts for process efficiency and material ordering.
Rivet Size and Length Calculator
Calculate rivet diameter and grip length from material thickness. Covers solid, blind, and structural rivets with drill bit sizes for aluminum and steel.
Drill Press Speed (RPM) Calculator
Calculate correct drill press RPM from bit diameter, material type, and surface cutting speed. Returns optimal RPM for steel, aluminum, wood, and plastics.
Grinding Wheel Surface Speed Calculator
Calculate grinding wheel surface speed in m/s and SFM from wheel diameter and RPM. Compares result to wheel max speed rating to ensure safe grinding operation.
Metal Annealing Temperature Calculator
Find annealing temperature, soak time, and cooling method for steel, copper, aluminum, brass, and titanium. Covers full, process anneal, and stress relief.
Plasma Cutter Amperage Calculator
Calculate plasma cutter amperage and travel speed for mild steel, stainless, and aluminum from material thickness. Helps select machine and consumables.
Sheet Metal Bending Allowance Calculator
Calculate bend allowance, bend deduction, and flat blank length for sheet metal. Enter material thickness, bend angle, inside radius, and K-factor.
Tap Drill Size Calculator
Find correct tap drill size for metric (M2-M30) and imperial (to 1-8 UNC/UNF) threads. Returns drill diameter in mm and inches at 75% thread engagement.
Thread Pitch Diameter Calculator
Calculate pitch diameter, minor diameter, and tap drill size for metric (M2-M36) and UNC/UNF threads. Returns bit size for 75% thread engagement in steel.
Lathe Cutting Speed (RPM) Calculator
Calculate the correct lathe RPM for any material and cutting tool diameter. Avoid burning tools or damaging workpieces with the wrong spindle speed.
Metal Weight Calculator
Calculate the weight of metal stock by shape — flat bar, round bar, tube, and sheet — for steel, aluminum, brass, and copper.
Welding Rod Calculator
Calculate welding rods or filler wire needed by joint type, metal thickness, and weld length. Covers stick (SMAW), MIG (GMAW), and TIG (GTAW) welding processes.