Engineering Calculators & Technical Reference Tools

Look up American Wire Gauge diameter, cross-sectional area, resistance, and standard NEC ampacity values.

Estimate voltage drop, load voltage, and percentage drop for single-phase and three-phase circuits.

Estimate wire fill percentage for EMT and PVC conduits using NEC Chapter 9 tables and THHN/THWN-2 wire areas.

Estimate motor full-load current from freely entered voltage and power, with NEC table references for comparison.

Decode resistor color bands and SMD markings with interactive resistor visualization.

Cross-reference NEMA 250 and IEC 60529 enclosure ratings and review where the standards do not map directly.

Identify voltage, amperage, wiring layout, and physical pinouts for common US straight-blade and twist-lock plugs.

Convert among six common torque units, including N·m, kgf·cm, kgf·m, lbf·in, lbf·ft, and ozf·in.

Estimate equipment power draw, heat output in BTU/h, energy use, and operating cost for industrial or commercial devices.

Estimate internal and external PCB trace width from current, copper weight, and allowable temperature rise.

Estimate cable ampacity with temperature and grouping derating inputs using simplified IEC 60287-style assumptions.

Estimate three-phase apparent power, real power, reactive power, and current from volts, amps, and power factor.

Process BOM CSV files locally to flag hazardous substance values against configured thresholds.

Convert and estimate watts, kilowatts, volts, amps, and VA for single-phase and three-phase electrical loads.

Calculate PLC variable offsets, account for alignment and padding, and export tag-oriented output.

Estimate power factor, kVAR, and current impact from kW, kVA, and power-factor correction targets.

Estimate UPS or battery backup runtime from battery voltage, amp-hours, load watts, inverter efficiency, and usable depth of discharge.

Estimate required battery amp-hours and watt-hours from load, runtime target, system voltage, efficiency, and usable discharge depth.

Estimate daily, monthly, and annual solar energy output from system size, sun hours, and system efficiency assumptions.

Estimate IEC 61131-3 scalar, string, and array data type sizes in bits and bytes for PLC memory planning.

Scale 4-20mA and 0-10V analog signals to engineering units and back for PLC, HMI, and SCADA workflows.

Convert PLC timer presets, base time units, and scan-based counter targets for ladder logic, IEC timers, and practical machine control workflows.

Convert practical engineering units for pressure, torque, length/thickness, and power from a single input value.

Convert Modbus coils, discrete inputs, input registers, and holding registers between reference numbers and 0-based offsets.

Compare practical cable size options for industrial runs using load current, circuit length, material, and target voltage-drop limits.

Summarize multiple circuit loads into total panel demand, estimated current, and spare capacity for practical panel schedule planning.

Estimate motor full-load current from voltage, power, efficiency, and power factor for practical feeder and protection planning.

Convert Siemens I, Q, M, and DB bit addresses between byte.bit notation, byte offsets, and absolute bit positions.

Interpret Rockwell and Allen-Bradley style PLC addresses such as N7:0, B3:1/0, T4:0.PRE, and C5:0.ACC.