Every appliance in your home has a hidden hourly wage it charges you. A space heater demands about 18 cents an hour at typical US rates; a modern LED television asks for less than a penny. You cannot see those wages on the devices themselves, which is why two households with identical habits can have wildly different power costs. This calculator exposes each appliance's true price tag.

Enter the wattage, the hours it runs each day, and your electricity rate, and the tool returns daily, monthly, and annual cost. That is the whole formula -- watts times hours divided by a thousand, times your rate -- but applied device by device it becomes a decision engine. A 20-year-old second refrigerator in the garage might cost $180 a year to run; a new ENERGY STAR model costs $60. The $120 annual difference pays for the replacement in a few years, and the calculator makes that payback visible in seconds.

Use it comparatively rather than once. Price the old dryer against a heat-pump model, the gaming PC left on overnight against sleep mode, the pool pump's 8-hour cycle against 5 hours. The winners are rarely the devices you suspect, and the losers are almost always the ones with heating elements. Rank your appliances, replace or reschedule the worst offenders, and keep the savings.

With the pre-filled defaults — Power (Watts) 100, Usage (hours/day) 8, Rate ($/kWh) 0.12 — the Energy Consumption Calculator returns Daily kWh 0.8000, Monthly kWh 24.00, Daily Cost ($) 0.0960, Monthly Cost ($) 2.88, Annual Cost ($) 35.04. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.