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Electronics calculators
Bookmark-worthy tools for every breadboard moment. Instant answers, formulas shown, no signup.
Resistors
Resistor Color Code Calculator
Decode 4-band and 5-band resistors instantly
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Resistors
Voltage Divider Calculator
Pick R1 and R2 for any target output voltage
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Fundamentals
Ohm's Law Calculator
Solve for V, I, R, or P from any two values
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LEDs
LED Resistor Calculator
Pick the right current-limiting resistor for any LED
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