Electrical, HVAC & Mechanical
Calculators and technical references for mechanical systems, electrical wiring layouts, and thermal building loads. Sized to meet National Electrical Code (NEC) and ASHRAE guidelines.
Interactive Calculators
⚡ Voltage Drop Calculator
Calculate electrical voltage drop and wire sizing. Estimates circuit safety limits using NEC copper/aluminum resistance.
🔥 BTU / HVAC Calculator
Calculate room BTU heating/cooling loads and HVAC tons. Evaluates insulation and solar exposure parameters.
⚙️ Gear Ratio Calculator
Calculate gear ratio, speed reductions, output RPM, and torque multipliers. Includes standard AGMA tooth calculations.
Reference Tables
- LTL Freight Class Density Breakpoints Crosswalk Table — Compare PCF density shipping class limits side-by-side.