Professional engineering calculators designed for practicing engineers, technicians, and students. Each calculator declares the formula used, simplifying assumptions, applicability limits, and referenced standards. Six disciplines are covered: SI unit conversions, electrical engineering (Ohm's law, power, voltage drop), thermal engineering (U-value, thermal resistance), hydraulic engineering (flow rate, velocity, pressure), structural engineering (stress, strain, bending moment), and workplace safety (NIOSH, noise).
SI unit conversions for power, energy, pressure, illuminance, current, and voltage. Exact conversion factors from BIPM definitions with explicit formulas.
Calculators for low-voltage electrical installations: Ohm's law, single-phase and three-phase power, current from power, voltage drop, power factor correction, conductor resistance, and energy consumption. Formulas follow IEC sign conventions and steady-state assumptions.
Steady-state heat transfer calculators for building and HVAC applications: wall U-value (thermal transmittance), multi-layer thermal resistance, sensible thermal power for air handling units, and temperature conversions across all common scales.
Incompressible fluid mechanics calculators for pipes and tanks in steady-state: volumetric flow rate, fluid velocity in circular conduits via the continuity equation, and hydrostatic pressure via Stevin's law.
Mechanics of materials calculators: normal stress, strain, elastic modulus (Hooke's law), bending moment for simply supported beams, allowable stress verification, moment of inertia for rectangular sections, and average stress checks. All within the linear-elastic domain.
Workplace safety calculators: NIOSH lifting index for manual material handling (ISO 11228-1), contact pressure on surfaces, and logarithmic sound level summation for noise exposure assessment.