Engineering calculators

Professional-grade engineering calculators for electrical circuits, structural loads, thermodynamics, and component sizing. Built to industry standards (IEEE, IEC) for students, makers, and working engineers.

Popular Engineering Calculators

• Ohm's Law Calculator — Calculate voltage, current, resistance, and power using Ohm's law.
• Power Calculator — Calculate electrical power using voltage and current.
• Voltage Drop Calculator — Calculate voltage drop in electrical wires and cables.
• Wire Size Calculator — Calculate the appropriate wire gauge for your electrical project.
• Solar Panel Calculator — Calculate solar panel requirements for your energy needs.
• Resistor Color Code Calculator — Decode resistor color bands to find resistance values.
• LED Resistor Calculator — Calculate the resistor value needed for LED circuits.
• Capacitor Calculator — Calculate capacitance, charge, and energy in capacitor circuits.
• Inductor Calculator — Calculate inductance and energy in inductor circuits.
• Transformer Calculator — Calculate transformer turns ratio and voltage conversions.

All calculators are accurate, require no signup, and run entirely in your browser. Browse all calculators →