Engineering calculators and references
Free engineering tools for metal stock weight, grade lookup, hardness conversion, threads, and cutting parameters
Tools our shop technologists use every day, gathered in one place. No registration, public formulas. If you need parts machined after running the numbers — send us a drawing and we'll quote it.
Most popular
Metal weight calculator
Weight and volume of sheet, bar, tube, angle, channel and other profiles by material and dimensions.
CalculateReferenceSteel grade equivalents
GOST, AISI, DIN, EN, JIS cross-references — composition, properties, applications.
CalculateConverterHardness conversion
HRC ↔ HB ↔ HV ↔ HRA ↔ HRB plus approximate tensile strength.
CalculateChartThread + tap drill chart
Metric (M), unified inch (UN), pipe (G/BSPP) — tap drill and clearance hole sizes.
CalculateFor technologistsCutting parameters
Cutting speed, spindle RPM, feed rate — for turning, milling and drilling.
Calculate