Electronics Tools
Ohm's Law Calculator
Calculate for:
Voltage (V)
Current (I)
Resistance (R)
Calculate
Resistor Color Code Tool
Select 4 or 5 bands:
4 Bands
5 Bands
Calculate Value
Voltage Divider Calculator
Input Voltage (Vin) [Volts]
Resistor R1 [Ohms]
Resistor R2 [Ohms]
Calculate Vout
LED Resistor Finder
Supply Voltage (Vs) [Volts]
LED Forward Voltage (Vf) [Volts]
LED Current (If) [mA]
Find Resistor
555 Timer Calculator (Astable Mode)
Calculate frequency and timing based on resistor and capacitor values.
Resistor R1 [Ohms]
Resistor R2 [Ohms]
Capacitor C [Microfarads (µF)]
Calculate