science

Monthly Electricity Cost Calculator

Estimate your monthly electricity bill: enter appliance wattage and daily usage hours, stack multiple appliances, with carbon emissions included.

Free online · Instant results

Appliances:

Power (W)

Hours/day

Days

Price (CNY/kWh)

Total cost over 30 days

¥145.20

264.0 kWh consumed

Per day8.80 度

Current @220V5.0 A

Monthly est.¥145.20

Yearly est.¥1766.60

Steps

1Energy/day = 1.10 kW × 8 h = 8.80 kWh (1 kWh = 1000W × 1h)
2Current I = P/U = 1100 ÷ 220 = 5.0 A
330 days: 264.0 kWh × ¥0.55 = ¥145.20

Appliance power reference

Appliance	Power	kWh/day	Cost/mo
AC 1.5HP ←	1.10 kW	8.80	¥145.2
Water heater	2.00 kW	4.00	¥66.0
Space heater	1.50 kW	9.00	¥148.5
Refrigerator	150.0 W	3.60	¥59.4
Washer	500.0 W	0.50	¥8.3
Desktop PC	300.0 W	2.40	¥39.6
LED bulb	10.0 W	0.06	¥1.0
Kettle	1.80 kW	0.54	¥8.9

💡 Heating appliances (AC, heater, kettle) dominate electricity bills — every +1°C on AC saves ~6-8% energy. Check standby drain too: chargers and set-top boxes idle at 1-5W each, adding up to 10-30 kWh/year.

Frequently Asked Questions

How do I estimate an appliance's monthly electricity cost?▼

Cost = wattage (kW) × hours per day × 30 × your rate per kWh. Example: a 1,000W appliance running 2h/day at $0.15/kWh costs about $9/month.

How do I use the Electric Power Calculator?▼

Open the page and fill in the input fields — results update automatically. P=VI, energy consumption and electricity cost.

Are the results accurate?▼

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?▼

Completely free. No registration, login or download required.

Does it work on mobile?▼

Yes. The responsive design works on phones, tablets and desktops.

💡

This is a dedicated variant of the Electric Power Calculator, pre-configured for this scenario with tailored FAQs.