Electrical Calculators
Fast, practical and easy-to-use electrical engineering calculators for electricians, technicians, engineers and students.
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3 Phase Motor Capacitor Calculator
Calculate the required capacitor size for 3-phase motor applications and capacitor conversion.
Calculate Now →Starting Capacitor Calculator
Estimate the starting capacitor size required for single-phase electric motor applications.
Calculate Now →Electrical Conduit Size Calculator
Determine the appropriate conduit size based on conductor quantity, size and conduit fill requirements.
Calculate Now →Voltage Drop Calculator
Calculate voltage drop for single-phase and three-phase electrical circuits.
Calculate Now →Lighting Calculator
Calculate lighting requirements using room dimensions, illuminance and lumens.
Calculate Now →Resistor Color Code Calculator
Decode resistor color bands and determine resistance, tolerance and resistor values.
Calculate Now →Power Factor Correction Calculator
Calculate the required capacitor kVAR to improve electrical power factor.
Calculate Now →Cable Size Calculator
Determine an appropriate electrical cable size based on load current and installation conditions.
Calculate Now →Load Current Calculator
Calculate electrical current from power, voltage and power factor for common electrical systems.
Calculate Now →Transformer Calculator
Calculate transformer current, apparent power and voltage relationships for electrical systems.
Coming Soon →Short-Circuit Current Calculator
Estimate fault current for electrical power system design and protection studies.
Coming Soon →Practical Tools for Electrical Professionals
Zoneleec combines practical electrical calculators with engineering explanations to help you work faster and make better technical decisions.
Easy to Use
Simple interfaces designed to get useful results quickly.
Clear Formulas
Understand the calculation instead of receiving only a number.
Practical Applications
Tools designed around real electrical engineering problems.
Technical Guides
Detailed explanations, examples and engineering resources.
Need More Than a Calculation?
Explore our electrical engineering guides for formulas, worked examples, design principles and practical applications.