Active Filter CalculatorDesign an Active Low Pass or High Pass Filter using an Operational Amplifier.

Battery Life CalculatorEstimate how long a battery will last for a given load.

Energy Storage CalculatorCalculate the energy stored in a Capacitor or an Inductor.

LED Resistor CalculatorCalculate the value of the series resistor needed for an LED.

Ohm's Law CalculatorCalculate Voltage, Current, Resistance, or Power using Ohm's Law.

Parallel Resistor CalculatorCalculate the total equivalent resistance of resistors connected in parallel.

Passive Filter CalculatorDesign a simple Passive RC Low Pass or High Pass Filter.

RC Time Constant CalculatorCalculate the RC time constant (τ) of a resistor-capacitor circuit.

Reactance CalculatorCalculate Inductive Reactance (XL) and Capacitive Reactance (XC) for a given frequency.

Resistor Color Code CalculatorDecode the color bands on 4-band and 5-band resistors to find their resistance.

Time-Frequency ConverterConvert between Frequency (Hertz) and Period (Seconds Measure).

Voltage Divider CalculatorCalculate the output voltage of a resistive voltage divider circuit.

Wheatstone Bridge CalculatorCalculate the unknown resistor value (Rx) in a balanced Wheatstone Bridge circuit.

dB to Power Ratio ConverterConvert between power ratios and decibels.

dB to Voltage Ratio ConverterConvert between voltage ratios and decibels.

dBm to Power ConverterConvert between dBm and Milliwatts (mW) with this converter.