Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to compute the rest.
Resistor Color Code Calculator
Decode 4-band and 5-band resistor color codes. Select band colors to determine resistance value and tolerance.
PCB Trace Width Calculator
Calculate required PCB trace width for a given current, copper thickness, and temperature rise per IPC-2221 standards.
LED Resistor Calculator
Determine the correct current-limiting resistor value for your LED circuit based on supply voltage and LED forward voltage.
Voltage Divider Calculator
Calculate output voltage and resistor values for voltage divider circuits. Supports loaded and unloaded configurations.
RC Time Constant Calculator
Compute the time constant, cutoff frequency, and charge/discharge behavior of RC circuits.
Power Dissipation Calculator
Calculate power dissipation in resistors, transistors, and ICs. Estimate temperature rise and heatsink requirements.
Unit Converter
Convert between SI units commonly used in electronics: capacitance, inductance, frequency, resistance, and more.
Industry Standard
All calculators use industry-standard formulas (IPC-2221, IEEE, IEC) and are validated against professional tools.
Instant Results
Real-time calculations as you type. No page reloads — all processing happens in your browser.
Free to Use
All tools are completely free, no account required. Bookmark them for quick access during your design workflow.
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