Electrical & Electronics Calculators

Ohm's law, resistor codes, power, and electronics calculators. Free online electrical & electronics calculators.

🔧 6 Free Calculators Available

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the others.

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Decode 4-band and 5-band resistor color codes to find resistance values. Visual color band selector.

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Calculate the correct resistor value for LED circuits based on supply voltage, LED voltage, and current.

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Find the correct wire gauge (AWG) for your electrical project based on current, distance, and voltage drop.

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Calculate power consumption and electricity costs for appliances based on wattage and usage hours.

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Calculate battery life based on capacity (mAh) and device power consumption. Estimate runtime for any device.

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Are these calculators free?

Yes, all calculators on DayAround are 100% free with no signup required.

Do the calculators work on mobile?

Yes, all calculators are fully responsive and work on any device.

How accurate are the results?

Our calculators use standard formulas and are tested for accuracy. Results are for informational purposes.