Electronics Calculators & Engineering Tools
Calculate resistor values, voltage dividers, battery life, power consumption, capacitance conversions and more with our free electronics engineering calculators.
Resistor Color Code Calculator
Instant resistor color code calculator with tolerance and PPM support.
Ohm's Law Calculator
Calculate Voltage, Current, Resistance, and Power instantly using Ohm’s Law.
Voltage Divider Calculator
Calculate output voltage using resistor divider circuits instantly.
Resistors in Series Calculator
Calculate total resistance of resistors connected in series instantly.
Resistors in Parallel Calculator
Instantly calculate equivalent resistance in parallel resistor circuits.
LED Resistor Calculator
Calculate the required resistor value for LEDs to prevent damage.
Battery Runtime Calculator
Estimate how long your battery will last based on load current & efficiency.
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