House Load Calculator

Q: How do I calculate my house electrical load?

List all appliances with their wattage and daily hours of use. Multiply watts × hours for each to get daily Wh. Sum all values and divide by 1000 for kWh/day. Multiply by 30 for monthly kWh, then by your electricity rate for monthly cost.

Q: What is a typical home electrical load?

A typical 3-bedroom home uses 20–50 kWh/day depending on climate and appliances. Heating and cooling account for 40–50% of energy use. All-electric homes with HVAC, water heating, and cooking can use 50–100 kWh/day.

Q: How do I find the wattage of my appliances?

Check the nameplate or label on the appliance — usually on the back or bottom. Look for a number followed by W (watts). For appliances without visible wattage, use a plug-in power meter (energy monitor). Manufacturer specifications online are also reliable.

Estimate your home's total electrical load and daily energy consumption. Select your appliances, enter their wattage and daily hours, and get total kWh and monthly cost.

This calculator provides estimates only. Always consult a qualified electrician for panel sizing and installation work.

Add Your Home Appliances

Click common appliances to add them, or add custom loads below.

Currency

Electricity Rate (per kWh)

Home Load Summary

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Peak Load (Watts)

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Daily Usage (kWh)

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Monthly Usage (kWh)

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Monthly Cost

Formula

Daily Wh = Sum of (Watts × Quantity × Hours/day)
Daily kWh = Daily Wh ÷ 1000
Monthly kWh = Daily kWh × 30
Monthly Cost = Monthly kWh × Rate

Typical Appliance Wattages

Appliance	Typical Watts	Average Daily Hours
Air conditioner (2-ton split)	2,000–2,500	6–10
Refrigerator (modern frost-free)	100–200	8–12 (compressor cycling)
Electric water heater (80L tank)	2,000–3,000	1–3
Washing machine	400–1,200	1–2
Electric oven	1,500–2,500	1–2
LED TV 55"	80–120	4–6
LED lights (per room)	15–40	4–8
Desktop PC + monitor	150–300	4–8
EV charger (Level 2, 7.2kW)	7,200	1–4
Pool pump (0.75 kW)	750	4–8

Energy-Saving Tips

Air conditioning is usually the largest single load — raising the setpoint by 1°C can reduce AC energy by 6–10%.
Replace old incandescent or halogen bulbs with LED — an LED uses 75–80% less energy for the same light output.
Set your water heater to 60°C (140°F) — high enough for hygiene, low enough to avoid wasted standby losses.
Run heavy appliances (dishwasher, washing machine, EV charger) at off-peak hours where time-of-use tariffs apply.
An EV on a Level 2 charger is often the second-largest energy user — factor this into solar and panel sizing.

Frequently Asked Questions

How do I calculate my house electrical load?

List every appliance with its wattage and daily hours of use. Multiply watts × hours for each item to get daily watt-hours. Sum all values and divide by 1000 for kWh/day. The peak load (watts) is the simultaneous running load — useful for sizing panels and generators.

What is a typical home electrical load?

A 3-bedroom home in a moderate climate uses 20–35 kWh/day. Homes with air conditioning, electric heating, and an EV charger can use 50–100 kWh/day. The US average is about 30 kWh/day (900 kWh/month). UK homes average 8–12 kWh/day.

How do I find the wattage of my appliances?

Check the label or nameplate (usually on the back or bottom). Look for "W" or "watts." The power rating listed is the maximum — actual consumption may be lower for variable loads like refrigerators or washing machines. For the most accurate figures, use a plug-in energy monitor for a few days.

What panel size do I need for my home?

Calculate your peak simultaneous load (all major appliances running at once). Add 25% safety margin. Size the service and panel to handle this. Most homes need 100A or 200A service. Homes with EV chargers, electric HVAC, and electric cooking may need 200A–400A. Use the Electrical Load Calculator or consult an electrician for panel sizing.