Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Electrical
Motor Starting Current Calculator
Calculate the full-load running current of a three-phase AC motor from its horsepower, voltage, and efficiency ratings. Useful for selecting circuit breakers, wire gauge, and motor starters.
Fill in the required fields to see your result.
Electrical
Circuit Breaker Sizing Calculator
Find the correct circuit breaker rating for any electrical load by entering the full-load current and a safety factor. Use this during panel design, home wiring projects, or electrical code compliance checks.
Fill in the required fields to see your result.
Key differences
| Motor Starting Current Calculator | Circuit Breaker Sizing Calculator | |
|---|---|---|
| Category | Electrical | Electrical |
| Inputs required | 4 | 2 |
| Result | Starting Current (A) | Circuit Breaker Size (A) |
| What it does | Calculate the full-load running current of a three-phase AC motor from its horsepower, voltage, and efficiency ratings. Useful for selecting circuit breakers, wire gauge, and motor starters. | Find the correct circuit breaker rating for any electrical load by entering the full-load current and a safety factor. Use this during panel design, home wiring projects, or electrical code compliance checks. |