Circuit Board Design Tool

Electronics Calculators

Enter any two values to calculate the others (V=IR, P=VI).

Voltage (V):

Current (I):

Resistance (R):

Power (P):

Number of Bands:

Band 1 Band 2 Multiplier Tolerance Tolerance

Resistance Value:

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Resistor Values (enter one per line or separated by comma/space):

Units (Ω, kΩ, MΩ) can be included, e.g., 10k, 0.5M, 470. Default is Ω.

Total Series Resistance:

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Total Parallel Resistance:

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Calculates the required resistor (R) to limit current through an LED.

Source Voltage (Vs):

LED Forward Voltage (Vf):

LED Forward Current (If):

Required Resistance (R):

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Resistor Power Dissipation (P):

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Converts standard 3-digit ceramic/film capacitor codes (e.g., 104) to capacitance values.

Enter 3-Digit Code:

Capacitance Value:

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