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Circuit Breaker Size CalculatorWhen you install an electrical appliance (e.g. washer or dryer), the question arises: "What circuit breaker size does a washer need?" Circuit breaker size calculator is an easy-to-use online tool to estimate the breaker size you need to protect your electrical appliances from an overload. A circuit breaker is rated in amperes, and the rating tells us how much current can safely flow through the breaker without causing it to trip. Generally, you should size a breaker for 125% of the load (25% safety factor). This calculator allows you to input up to 5 different electrical appliances to estimate the total load the breaker will need to protect. To calculate the total load this tool uses the following equations:
where: I — resulting current; W — appliance's wattage; V — voltage; PF — power factor. This calculator provides an estimate only. Always verify wire size, installation conditions, and local electrical requirements before installing or replacing a circuit breaker. Allow a licensed electrician to install the correct circuit breaker size for your appliances! You might also find helpful: 3 Phase Calculator. Frequently Asked QuestionsWhy electricians need the circuit breaker size calculator?Choosing the wrong circuit breaker size is one of the most common — and most dangerous — electrical mistakes. This calculator helps users quickly determine the correct breaker rating based on load current, voltage, and application type, reducing the risk of overheating, nuisance tripping, and fire hazards. Electricians and home improvement enthusiasts use this calculator to:
Safer circuits, fewer callbacks, and more confidence at the panel. Example 1. Adding a New Appliance CircuitA homeowner installs a new electric water heater and needs to confirm the correct breaker size. By entering the load current and voltage, the calculator recommends the proper breaker rating, helping prevent overheating and code violations. Example 2. Workshop or Garage UpgradeAn electrician adds new outlets for power tools in a garage. The calculator ensures the selected breaker can handle the continuous load without nuisance tripping during tool startup. Example 3. Replacing a Frequently Tripping BreakerA DIYer experiences repeated breaker trips in a kitchen circuit. Using the calculator, they confirm whether the existing breaker is undersized or if the load exceeds safe limits — before swapping parts blindly. How do I know what size circuit breaker I need? You need to know the current draw (amps) of the load and apply the appropriate safety margin. This calculator does that instantly.
Can I replace a breaker with a higher amp rating? Not without verifying wire size and load requirements. Oversizing a breaker can cause wire overheating and fire risk. This calculator helps avoid that mistake.
Does this calculator work for 120V and 240V circuits? Yes. It can be used for standard residential voltages, including common household and appliance circuits.
Why does my breaker keep tripping even though it’s the right size? Possible causes include continuous overloads, motor inrush current, faulty appliances, or wiring issues. The calculator helps rule out breaker sizing errors first.
Is this calculator suitable for DIY home projects? Yes. It’s designed for electricians and informed homeowners who want a quick, reliable way to estimate breaker size before installation.
How to calculate breaker size for a refrigerator?Step 1: Gather Refrigerator SpecificationsA standard household refrigerator (e.g., 20–25 ft³) typically has:
Step 2: Enter the Data in the Calculator
Result:So, a 10-amp circuit breaker is suitable for a dedicated refrigerator line — which is standard for residential use in Florida. |
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