Calculators for manufacturing
Free, instantly usable calculators for engineers, work planners and buyers — from metal weight to machine hourly rate.
Metal weight calculator
Calculate the weight of steel, stainless, aluminium, copper and more — for plates, bars, tubes and profiles. Free and instant.
Metal weight calculator →
Cutting speed and RPM calculator
Convert cutting speed (vc) to spindle speed (rpm) and feed rate (vf) for milling, turning and drilling. Instant, for any diameter.
Cutting speed and RPM calculator →
Machine hourly rate calculator
Calculate the cost price and hourly rate of a machine from investment, depreciation, energy, maintenance and labour.
Machine hourly rate calculator →
Bolt tightening torque calculator
Find the correct tightening torque (Nm) for each bolt size and property class (8.8, 10.9, 12.9) — with a full table from M5 to M30.
Bolt tightening torque calculator →
ISO 2768 general tolerances
General linear tolerances per ISO 2768-1 (class f, m, c, v) — the tolerance for dimensions without an individual note on the drawing.
ISO 2768 general tolerances →
Metric thread and tap drill chart
Pitch, tap drill and clearance hole for each metric thread size, from M3 to M24.
Metric thread and tap drill chart →
Hardness conversion (HRC / HV / HB)
Convert hardness between Rockwell (HRC), Vickers (HV) and Brinell (HB), with a tensile strength estimate.
Hardness conversion (HRC / HV / HB) →
Material density table
Density of steel, stainless, aluminium, copper, brass and more — in g/cm³ and kg/m³.
Material density table →
ISO 286 fits table
Common fits (H7/g6, H7/k6, H7/s6…) with their character — clearance, transition or interference — and typical use.
ISO 286 fits table →