Before the breaker trips.
Household Electrical Load Compatibility Checker
Add your appliances and instantly see total wattage, amperage draw and whether your electrical system can handle everything at once.
Private · Local · No account
- 120V and 230V systems
- Breaker recommendations
- Private, in your browser
Check your household electrical load
Live - local onlyYour compatibility status will appear here
Add your appliances (or load a room preset), then results update live — watts, amps, capacity and cost.
Everything runs locally in your browser — no appliance data is sent anywhere. Results are planning estimates only, not electrical or safety advice. Always consult a licensed electrician for installations, permit work, and safety decisions.
A practical answer, before the long explanation.
Select your voltage
Choose 120V (US / Canada) or 230V (UK / EU / AU / Asia) to match your household supply.
Add your appliances
Enter each appliance's wattage and quantity — or load a room preset for a quick start.
Get instant results
See total load in watts and amps, compatibility status, and circuit breaker recommendations.
What this check assumes
This tool totals appliance wattage and applies the formula Current (Amps) = Power (Watts) ÷ Voltage (Volts), then compares the draw against the 80% continuous-load rule for a typical household service — 200A at 120V, 100A at 230V.
Real homes seldom run every appliance at full rated power at the same time, and local codes, wiring, load factors and panel details vary. The breaker suggestions and cost estimates are planning figures, not engineering advice.
Everything runs locally — nothing you type leaves your browser. For new circuits, panel upgrades or any permit-required work, consult a licensed electrician.
The formulas
Current (Amps) = Power (Watts) ÷ Voltage (Volts)
Example: a 1,500W kettle on a 230V supply draws 6.5A.
Continuous load limit = breaker rating × 80%
A 20A breaker should not carry more than 16A continuously.
Daily energy (kWh) = watts ÷ 1,000 × hours
Cost = daily kWh × your rate, scaled to month and year.
Frequently asked questions
How do I calculate my household electrical load?
Add each appliance with its wattage rating and quantity. The tool automatically calculates total watts and amps using the formula: Current (Amps) = Power (Watts) ÷ Voltage (Volts). For a 230V system, a 1500W heater draws 6.5A.
What is the 80% rule for circuit breakers?
The 80% rule states that a circuit should not be loaded beyond 80% of its rated capacity for continuous loads. For a 20A circuit, the maximum continuous load is 16A. This tool applies this rule automatically.
How many watts can a standard household circuit handle?
A typical 15A/120V circuit handles up to 1440W continuously (80% rule). A 20A/120V circuit handles 1920W. For 230V systems, a 16A circuit handles 2944W continuously. The total household service is typically 100-200A.
Which appliances need dedicated circuits?
High-wattage appliances (1500W+) should have dedicated circuits: electric ovens, water heaters, dryers, air conditioners, EV chargers, and large kitchen appliances. This prevents nuisance tripping and ensures safety.
Is this tool accurate?
The tool uses standard electrical formulas (P = V × I) and applies industry-recognized safety margins. However, it provides estimates. Always consult a licensed electrician for actual installations and permits.