What the estimate tells you
A motor-current calculation is useful for early planning and cross-checking. It estimates line current from output power, supply voltage, efficiency and power factor.
Actual current depends on motor design, loading, supply conditions and operating point.
Three-phase matters
For balanced three-phase systems the square-root-of-three factor is part of the power relationship. Confusing single-phase and three-phase formulas can create a large error.
Nameplate before final decisions
Use the motor nameplate and manufacturer documentation for final protection, cable and starter decisions. Starting current can be many times the normal running current and needs separate consideration.
Use the related tools
Engineering guidance only. For safety-critical work, follow the applicable manufacturer data, drawings, standards and competent professional judgement.