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Electronics Calculators
Free online electronics calculators for resistors, LEDs, capacitors, and circuit design.
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Resistor Color Code
Decode 4-band and 5-band resistor color codes.
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LED Resistor
Calculate LED current-limiting resistors.
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Capacitor Charge
Calculate RC time constants and charge times.
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Resistor Color Code
Decode 4-band and 5-band resistor color codes to find resistance and tolerance
Resistance
1.0 kΩ ±5%
Min: 950 Ω · Max: 1.05 kΩ
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LED Resistor Calculator
Calculate the current-limiting resistor value and power dissipation for LEDs
Required Resistor
R = 160 Ω
Power: 0.064 W
Resistor (Ω)
160
Nearest E12
180 Ω
Nearest E24
150 Ω
Power (W)
0.064
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Capacitor Charge Calculator
Calculate charge time, voltage, and time constant for RC circuits
τ = RC Time Constant
τ = 0.100 s
Time to reach 63.2%: 0.100 s
τ (τ = RC)
0.10 s
5τ (Full Charge)
0.50 s
Target Time
0.10 s
C·R Product
0.100