Electrical & Electronics

Electronics work comes down to getting the right values every time. Using the wrong resistor, undersizing a wire, or misjudging a battery's capacity can damage components, create safety hazards, or simply mean your project does not work as intended. Our Electrical and Electronics calculator suite covers the most common circuit design and troubleshooting tasks in one straightforward location.

Ohm's Law and Basic Circuits

The Ohm's Law Calculator is the starting point for any electronics project. Enter any two of voltage (V), current (I), and resistance (R), and the tool instantly calculates the third. It also shows you the power in watts so you know whether your components are within their rated capacity before you connect anything.

This single calculation underpins all circuit analysis. Whether you are a student working through your first electronics lesson or a professional checking a design, this tool handles the arithmetic quickly and accurately.

Resistors and Color Codes

The Resistor Color Code Calculator reads the colored bands on any resistor and tells you its resistance value and tolerance. Just select the band colors in order and get the value instantly. The reverse function lets you enter a resistance value and see the corresponding band colors to look for in your component drawer.

Our tool supports 4-band, 5-band, and 6-band resistors, covering everything from basic hobbyist parts to precision resistors used in professional equipment. Color code specifications follow IEC international standards for consistent and reliable outputs.

Wiring, Power, and Battery Tools

The Voltage Drop Calculator helps you determine whether a wire run is long enough to cause a meaningful voltage loss. This matters in 12V systems, solar installations, and long cable runs in vehicles or buildings. Enter the wire gauge, current, and cable length to see the percentage drop and whether it is within safe limits for your application.

The Wire Gauge (AWG) Calculator recommends the correct wire size for a given current and distance. Undersized wire creates dangerous heat buildup over time. The Battery Life Calculator estimates runtime by dividing battery capacity (mAh) by your device's current draw (mA), giving you a reliable planning number for any battery-powered project.

LED and Capacitor Calculators

Adding an LED to a circuit always requires a current-limiting resistor. The LED Resistor Calculator determines the correct resistor value based on your supply voltage, the LED's forward voltage, and its rated current. Skipping this step burns out LEDs immediately, so this calculator is a basic safety check for any LED circuit.

The Capacitor Charge and Discharge Calculator helps you understand RC circuit timing for delay circuits, filters, and oscillators. Precise timing is important in these applications, and having the numbers right before building saves a lot of troubleshooting time later.