Free Online Electrical & Electronics Calculators

Electricity can be intimidating — but the math behind it doesn't have to be. Our electrical and electronics calculators are built for engineers, technicians, students, and hobbyists who need fast, accurate answers without digging through textbooks. Need to apply Ohm's law? Sizing a wire for safe ampacity? Trying to decode a resistor color band? Just plug in your values and get the answer. From voltage dividers and power consumption estimates to transformer ratios and RC timing circuits, these tools cover everything from home wiring projects to PCB design. Less time calculating, more time building.

ADC/DAC & Digital Calculators

16 tools

Attenuators Calculators

8 tools

Audio & Acoustics Calculators

9 tools

Basic Circuit Laws Calculators

8 tools

Batteries & Energy Storage Calculators

12 tools

Capacitors Calculators

12 tools

Communication & Networking Calculators

11 tools

Electrical Conversions Calculators

33 tools

Electrical Installation Calculators

10 tools

Electrical Safety & Protection Calculators

11 tools

Electromagnetism Calculators

38 tools

Filters Calculators

10 tools

Inductors Calculators

9 tools

Lighting Calculators

10 tools

Motors & Drives Calculators

14 tools

Op-Amps Calculators

16 tools

PCB Design Calculators

14 tools

Power Calculators

10 tools

Power Supply & Regulators Calculators

17 tools

RC/RL/RLC Circuits Calculators

11 tools

RF & Microwave Calculators

26 tools

Resistors Calculators

13 tools

Sensors & Measurement Calculators

10 tools

Signals & Waveforms Calculators

12 tools

Solar & Renewable Energy Calculators

12 tools

Thermal Management Calculators

7 tools

Three-Phase Systems Calculators

8 tools

Timer & Oscillator Circuits Calculators

13 tools

Transformers Calculators

10 tools

Transistors & Semiconductors Calculators

16 tools

Wiring & Cables Calculators

9 tools