750 watts to kWh per day and month

18.00 kWh/day

for 750 W running 24/7 · 540 kWh/month · $89.10/month at 16.5¢

750 W by hours of use

Use	Per day	Per month	Cost/month
1 h/day	0.75 kWh	22.5 kWh	$3.71
2 h/day	1.50 kWh	45.0 kWh	$7.43
4 h/day	3.00 kWh	90.0 kWh	$14.85
8 h/day	6.00 kWh	180.0 kWh	$29.70
12 h/day	9.00 kWh	270.0 kWh	$44.55
24 h/day	18.00 kWh	540.0 kWh	$89.10

kWh = W × hours ÷ 1000. Devices with thermostats or compressors cycle, so actual use is often lower than the rated wattage × hours.

18.00 kWh running 24 hours, 6.00 kWh at 8 hours.