Engineering Calculators
Browse one canonical library of traceable engineering calculations. Live tools retain their inputs, formulas, assumptions and review notices.
Fundamental Engineering
Units, statics, mechanics of materials and engineering fundamentals.
Machine Design
Shafts, joints, component sizing and mechanical design checks.
Available calculators
Shaft Diameter CalculatorPreliminary torsional sizing for solid and hollow shafts.Open →Shaft Diameter - SolidSize a solid circular shaft from transmitted torque and allowable shear stress.Open →Shaft Diameter - HollowSize the outside diameter of a hollow circular shaft from torque, inner diameter and allowable stress.Open →Shaft under TorsionCalculate maximum torsional shear stress in a solid circular shaft.Open →Shaft under BendingCalculate nominal maximum bending stress in a solid circular shaft.Open →Combined Bending + TorsionEstimate maximum shear stress from simultaneous bending moment and torque.Open →Shaft Critical SpeedEstimate first critical speed from known static deflection at a concentrated rotating mass.Open →Shaft DeflectionCalculate mid-span deflection of a simply supported solid shaft under a central load.Open →Shaft Angle of TwistCalculate angular twist of a solid circular shaft under torque.Open →Shaft Power TransmissionCalculate transmitted mechanical power from torque and rotational speed.Open →Shaft TorqueCalculate shaft torque from transmitted power and rotational speed.Open →Shaft StabilityScreen a shaft for Euler axial buckling under compressive load.Open →Shaft FatigueEstimate a torsional Goodman fatigue safety factor for a shaft.Open →Keyway Shaft DesignCalculate key shear and bearing stress from transmitted torque.Open →Gears
Ratios, tooth geometry, loads, efficiency and gear-train design.
Bearings
Bearing selection, life, lubrication and load analysis.
Available calculators
Bearing Life CalculatorEstimate basic rating life for a radial ball bearing.Open →Springs
Helical, leaf and torsion spring geometry, stress and rate.
Bolts & Fasteners
Preload, joint strength, thread engagement and bolted-joint design.
Welded Joints
Weld sizing, weld groups and static or fatigue loading.
Pressure Vessels & Piping
Pressure containment, piping geometry and flow support calculations.
Beams & Structural Mechanics
Bending, shear, deflection, section properties and structural response.
Fatigue & Failure
Fatigue criteria, stress concentration and failure theories.
Fluid Mechanics
Flow, pressure loss, velocity, head and hydraulic behavior.
Pumps
Pump power, system curves, operating points and pump selection.
Available calculators
Pump Power CalculatorEstimate hydraulic and input power for a pump.Open →Motors & Power Transmission
Torque, speed, motor sizing and power-flow calculations.
Available calculators
Torque CalculatorCalculate transmitted torque from power and rotational speed.Open →Heat Transfer
Conduction, convection, radiation and heat-exchanger calculations.
Thermodynamics
Energy balance, properties, cycles and state-change calculations.
HVAC & Refrigeration
Cooling loads, psychrometrics, air systems and refrigeration cycles.
Machining
Cutting speed, feeds, power, material removal and tool-life estimates.
Sheet Metal
Bend allowance, flat pattern, forming and press-brake calculations.
Available calculators
Sheet Metal Flat Pattern CalculatorDevelop a sheet-metal blank from bend geometry and folded-part dimensions.Open →Press Brake Bending Tonnage CalculatorEstimate bending force, press tonnage and preliminary machine capacity.Open →Sheet Metal Bend Allowance CalculatorCalculate bend allowance using bend angle, radius and K-factor.Open →Welding & Fabrication
Fabrication mass, weld processes, layouts and workshop estimates.
Available calculators
Plate Weight CalculatorCalculate plate mass from dimensions and density.Open →Unit Conversion & Manufacturing Economics
Unit conversion, mass estimates, rates and manufacturing cost drivers.