Electricity Cost Calculator
Estimate kWh usage and electricity cost for an appliance by wattage, hours and your rate.
Example values are shown — change any of them and the answer updates live.
$/kWh
Wh/day
Wh/day
Wh/day
Monthly cost
$17.77
3 appliances, 3.95 kWh/day at $0.15/kWh.
Daily cost$0.59
Yearly cost$216.26
Monthly kWh118.5 kWh
kWh = watts × hours ÷ 1000. Your actual bill adds standing charges and taxes.
Old vs LED bulbs
LED 10 W × 5 h
$2.74/yr
LED 10 W
Old 60 W × 5 h
$16.43/yr
60 W
Switching saves per year, per bulb.
$13.69/yr
Monthly cost
Step 1 · Monthly kWh
kWh = W × h ÷ 1000 × 30
3.95 kWh/day
118.5 kWh
Step 2 · Monthly cost
cost = kWh × rate
118.5 × 0.15
$17.77
Estimates under the stated assumptions, for illustration — not financial advice.