Electronics
Calculators for electronics and makers: Ohm’s law (voltage, current, resistance, power), resistor color code, LED series resistor, voltage divider and battery life. Exact formulas, instant results, 100% in your browser.
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Ohm’s law calculator
Enter any 2 of U, I, R → voltage, current, resistance and power.
Electronics Open
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Resistor color code
4 color bands → resistance value in ohms and tolerance.
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LED resistor calculator
Voltage, Vf and current → series resistor and power for your LED.
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Voltage divider calculator
Vin, R1 and R2 → output voltage Vout and divider current.
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Battery life calculator
Capacity (mAh) and current draw (mA) → estimated runtime in hours.
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Capacitor code calculator
Decode a 3-digit code into pF, nF and µF.
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Wire gauge (AWG)
Diameter, cross-section and max current of a wire by AWG.
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Series & parallel resistors
Equivalent resistance of several resistors in series or parallel.
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