Engineering Calculators, Done Right
Fast, accurate, and free calculators for electrical, mechanical, and civil engineers. No signup required.
Resistor Color Code
Decode 4-band and 5-band resistor color codes instantly. See resistance value, tolerance, and temperature coefficient.
Electrical ⚡Voltage Divider
Calculate output voltage, current, and power dissipation for resistive voltage divider circuits.
Electrical 🔌Cable Cross-Section
Size cables correctly based on current load, voltage drop, and installation method. Supports AWG and metric.
Electrical 📐Unit Conversion
Convert between engineering units: length, area, volume, pressure, temperature, and more.
General ⚙️Power Calculator
Calculate electrical power using Ohm's law. Find voltage, current, resistance, or power from any two values.
ElectricalWhy CoreCalx?
CoreCalx is built for engineers who need quick, reliable calculations without distractions. Every calculator is optimized for accuracy and speed — no bloated interfaces, no signup walls, no intrusive ads between you and your answer.
Whether you're sizing a cable, decoding a resistor, or converting units on the job site, CoreCalx gets you the answer in seconds. Built by engineers, for engineers.