RESISTOR CALC
BBobop Tool #1875
Color Code
Ohm's Law
Series/Parallel
Voltage Divider
LED
Resistor Color Code
Band Count
4-Band
5-Band
6-Band
--
Resistance
Reverse Lookup
Resistance Value
Bands
4-Band
5-Band
Lookup
Supports values like 470, 4.7k, 1M, 2.2, 100k, 10R
Color Code Reference
Color
Digit
Multiplier
Tolerance
Temp Coeff
Ohm's Law Calculator
Enter any two values to calculate the other two.
V
I
R
V=IR P=IV P=I²R P=V²/R
Voltage (V)
Current (A)
Resistance (Ohm)
Power (W)
Calculate
Clear
Series / Parallel Calculator
Series
Parallel
Resistance Value
Add
--
Total Resistance
Voltage Divider
Vin (V)
R1 (Ohm)
R2 (Ohm)
Calculate
Vin
R1
Vout
R2
GND
LED Resistor Calculator
Supply Voltage (V)
LED Color Preset
Custom
Red (2.0V / 20mA)
Green (2.2V / 20mA)
Blue (3.3V / 20mA)
White (3.3V / 20mA)
Yellow (2.1V / 20mA)
IR (1.2V / 20mA)
LED Forward Voltage (V)
LED Forward Current (mA)
Calculate