Octa
Calc
Electronics calculators
Octa
Calc
A collection of simple, fast, and practical calculators for electronics and electrical engineering.
LED
LED Resistor Calculator
Find the correct current-limiting resistor for any LED
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V÷
Voltage Divider Calculator
Calculate output voltage from two resistors and an input voltage
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Ω
Ohm's Law Calculator
Solve for voltage, current, or resistance given any two values
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🔋
Battery Life Calculator
Estimate how long a battery will last at a given current draw
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W
Power Calculator
Calculate power in watts from voltage and current
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