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Electricity Calculator – Calculates electricity cost from appliance watt...

The Electricity Calculator calculates electricity cost from appliance wattage, usage time, and utility rate. This Electricity Calculator applies a standard electronics formula to solve for the unknown variable when the others are known. Keep units consistent for accurate results.

The formula behind this calculator: Cost = (watts / 1000) x hours used x price per kWh. As a practical example: A 1,500-watt heater run 5 hours/day at $0.15/kWh costs about $1.13/day. All results are calculated instantly in your browser — no data is stored or transmitted.

Electricity Calculator FAQ

What does the Electricity Calculator calculate?

Calculates electricity cost from appliance wattage, usage time, and utility rate.

What is the tolerance on resistor values?

Standard resistors come in E12 or E24 series with tolerances of 5% or 1%. The colour code includes a tolerance band (gold = 5%, silver = 10%, none = 20%).

Do these formulas apply to AC and DC circuits?

Ohm's Law applies directly to DC circuits. For AC, it applies to resistive behaviour, but reactive components (capacitors, inductors) require impedance calculations instead.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.