Motor FLA Calculator

Enter motor voltage and power freely to estimate full-load current and a starting circuit-breaker sizing reference.

Motor Specification

Circuit Parameters

Estimated FLA
0.0 A
Calculated from your voltage and motor power inputs.
Min. Circuit Breaker Sizing
0.0 A
Starting reference at 125% of calculated FLA.

⛔ High-Risk Engineering Notice:
This tool estimates values using generalized standards and assumptions. Site conditions, installation methods, conductor grouping, ambient temperature, tolerances, and code interpretations can materially change the final result. Treat these outputs as a preliminary engineering aid and perform project-specific verification against the governing code, manufacturer data, and a qualified engineer before field use or procurement.

Frequently Asked Questions

What is motor FLA?

Motor FLA means full-load amperes, which is the standard current value commonly used as a reference when sizing conductors and protective devices for a motor circuit.

Does this calculator compute current from my inputs or only look up NEC values?

This calculator estimates motor full-load current from the voltage and power you enter. It also shows the nearest NEC table reference when available so you can compare your calculated value with common code lookup values.

Estimated Full-Load Current from Entered Motor Data

This tool estimates motor full-load current from the voltage and power you enter. It uses a practical motor current approximation with assumed efficiency and power factor so you can work with freely entered values instead of being limited to fixed table pairs.

For quick code comparison, the calculator also shows the nearest National Electrical Code reference from Tables 430.248 (single-phase) and 430.250 (three-phase) when a nearby standard entry exists.

Circuit Breaker Sizing

Per NEC Section 430.52, motor branch-circuit short-circuit and ground-fault protective devices are typically referenced from the tabulated FLA values in Tables 430.248/430.250 rather than the motor nameplate current. The percentage used depends on device type and applicable exceptions, so this tool should be read as a starting reference rather than a final protection coordination result.