Appliance Energy Calculator

What This Calculator Does

Select a household appliance from the dropdown and the calculator auto-fills a typical wattage for that device. Enter the hours per day you use it and get daily, monthly, and annual energy consumption in kWh. You can override the wattage at any time for a device that uses more or less than the preset.

This calculator uses preloaded appliance power values for convenience. It shows kWh only — no cost or tariff. To estimate running cost, take the kWh result to the Electricity Cost Calculator.

Typical Power Usage by Appliance

Worked Examples

Example 1 — Air conditioner (1,500 W, 8 h/day):
(1,500 × 8) ÷ 1,000 = 12 kWh/day → 360 kWh/month
A single window AC unit running all day is the dominant energy load in most homes during summer. Central AC at 4,000 W × 8 h = 32 kWh/day.

Example 2 — TV (100 W, 5 h/day):
(100 × 5) ÷ 1,000 = 0.5 kWh/day → 15 kWh/month
Relatively low consumption. Standby draw (0.5–2 W) adds a small but continuous background load.

Example 3 — Refrigerator (150 W rated, cycling):
Rated: (150 × 24) ÷ 1,000 = 3.6 kWh/day — but the fridge cycles.
Realistic (60 W effective): (60 × 24) ÷ 1,000 = 1.44 kWh/day → 526 kWh/year
The calculator flags cycling appliances and suggests halving the wattage. Check the EU/UK energy label for your exact model’s annual kWh.

How to Reduce Appliance Energy Use

• Reduce runtime — shorter usage time has a direct linear effect; even 30 minutes less per day compounds significantly over a year
• Choose efficient models — inverter ACs use 30–50% less than fixed-speed; A+++ rated refrigerators use 60% less than older models
• Maintain appliances — dirty AC filters increase draw by 10–15%; a fridge with worn door seals works harder and uses more energy
• Avoid idle draw — switch off at the socket when not in use; avoid “instant-on” standby modes for high-wattage devices

Appliance Energy vs General Energy Calculation

Two tools, two use cases:

• This calculator (appliance-focused): dropdown of common devices with realistic preset wattages, a cycling-appliance warning, and an override for custom values. Best for quick real-world estimates without looking up specifications.
• Energy Consumption Calculator: accepts any wattage as a manual input. Use it when you have the exact wattage from a spec sheet, energy label, or smart plug measurement.

Important Limitations

• Preset wattages are estimates: actual power draw varies by brand, model, age, settings, and load. For the most accurate result, read the wattage from the EU/UK energy label or measure with a smart plug.
• Cycling appliances are overestimated at full wattage: refrigerators, ACs, and washing machines do not run continuously at rated power. The calculator warns you when a cycling appliance is selected — reduce wattage to reflect actual average draw.
• No standby or background load: devices in standby draw 0.5–5 W constantly. This calculator does not include that load unless you run a separate calculation.