Daily kWh = Watts × hours ÷ 1000. Multiply by your tariff for cost. Convenient for working out whether to swap an old appliance for a more efficient one.
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Typical appliance wattages
LED bulb 9 W, CFL 23 W, incandescent 60–100 W
Refrigerator (running) 100–200 W — runs ~30% duty cycle
Microwave 800–1200 W, oven 2000–3000 W
1.5-ton AC: 1500–1800 W (3-star), 1100–1300 W (5-star inverter)