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Bolt Torque Calculator
Estimate tightening torque from bolt diameter, target preload and nut factor.
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Tap Drill Calculator
Find an approximate metric tap drill from major diameter and thread pitch.
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Clearance Hole Calculator
Choose a practical clearance hole for a metric bolt.
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Thread Pitch Converter
Convert threads per inch into millimetres per thread.
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Steel Plate Weight Calculator
Calculate steel plate mass from length, width and thickness.
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Round Bar Weight Calculator
Calculate mass of solid steel round bar.
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Pipe Weight Calculator
Estimate steel pipe mass from OD, wall and length.
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Surface Speed Calculator
Calculate cutting surface speed from diameter and RPM.
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Spindle RPM Calculator
Find spindle RPM from cutting speed and diameter.
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Feed Rate Calculator
Calculate milling feed from RPM, flutes and chip load.
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Voltage Drop Calculator
Estimate DC copper cable voltage drop.
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Battery Runtime Calculator
Estimate battery runtime from Ah, voltage, load and efficiency.
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Hydraulic Cylinder Force Calculator
Calculate theoretical cylinder push force.
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Belt Length Calculator
Estimate open belt length for two pulleys.
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Gear Ratio Calculator
Calculate speed ratio for a simple gear pair.
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Concrete Volume Calculator
Calculate slab volume including waste allowance.
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Beam Deflection Calculator
Estimate midspan deflection for a simply supported beam with central point load.
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Welding Heat Input Calculator
Calculate nominal welding heat input per unit length.
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Pump Power Calculator
Estimate hydraulic pump shaft power.
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Air Changes Per Hour Calculator
Calculate room air changes from airflow and dimensions.
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Engineering Academy
Plain-English guides to preload, cutting speed, materials, hydraulics, voltage drop and tolerances.
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Metric threads, UNC/UNF, tapping drills, material densities and useful constants.
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