Fridge: 150W, about 9 hours a day, 30 days, rate 10 — 40.5 units, 405 taka.
More: typical wattages
Typical values: ceiling fan 75–100W, fridge 100–200W, TV 80–150W, water pump 750W, iron 1,000W, AC 1,500–2,000W. Check the sticker on your device. For the whole-house slab bill, see the electricity bill calculator.
Frequently asked questions
What is the appliance-cost formula?
Units = watts × hours × days ÷ 1,000; cost = units × rate. 100 × 8 × 30 ÷ 1,000 = 24 units; 24 × 10 = 240 taka.
What is 1 unit?
1 unit = 1 kilowatt-hour: a 1,000W appliance running 1 hour uses 1 unit.
How do I count a fridge, which cycles on and off?
A fridge compressor runs about 8–10 hours a day on average. Enter 9 in the hours box.
Why is AC cost so high?
An AC draws 1,500–2,000W, so 8 hours a day means 360–480 units a month. For an inverter AC, count 30–40% less.
Does a switched-off device with a red light use power?
Yes, a little — standby drain. Switch off TVs and decoders at the socket when not in use.
Where do I find the per-unit rate?
Your electricity bill lists slab-wise rates. They range roughly 5–14 taka; enter your slab's rate.