Professional Electrical Calculators
For Electricians, Engineers, and Makers
Fast, accurate electrical calculations for Ohm's Law, voltage drop, wire sizing, and more. All calculations performed client-side with no external APIs required.
Popular Tools
Ohm's Law Calculator
Calculate voltage, current, resistance, and power with our comprehensive Ohm's Law calculator.
Watts to Amps Converter
Convert between watts and amps for DC and AC circuits with power factor support.
Electricity Cost Calculator
Calculate your electricity usage and costs with our appliance cost calculator.
All Calculators
Ohm's Law Calculator
Calculate voltage, current, resistance, and power with our comprehensive Ohm's Law calculator.
Voltage Drop Calculator
NEC-compliant voltage drop calculator for wire sizing and circuit design.
Watts to Amps Converter
Convert between watts and amps for DC and AC circuits with power factor support.
Wire Size Calculator
Determine the correct wire gauge for your electrical project based on current and length.
Electricity Cost Calculator
Calculate your electricity usage and costs with our appliance cost calculator.
Resistor Color Code
Decode resistor color bands and find resistance values instantly.
LED Resistor Calculator
Calculate the perfect current-limiting resistor for your LED circuits.
Parallel Resistor Calculator
Calculate equivalent resistance for resistors in series and parallel.
Fast & Accurate
Instant calculations with precision you can trust for professional work.
Mobile-First
Fully responsive design works perfectly on phones, tablets, and desktops.
Privacy First
All calculations happen in your browser. No data sent to servers.
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Visual Resource Performance Analysis Tool
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Important Disclaimer
All calculations are provided as-is for estimation purposes. Always verify with local electrical codes (NEC) and consult with a licensed electrician for final decisions. This tool is not a substitute for professional electrical engineering advice.