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RC Motor KV RPM Calculator

Compute a brushless motor’s theoretical no-load RPM from KV and supply voltage.

Motor

Nominal pack voltage or a specific value.

Result

Theoretical no-load RPM
34,040RPM
Input voltage
14.8V

No-load figure — under load the real RPM is lower (voltage sag, load, efficiency).

Formula

  1. 1.Theoretical No-load RPM = KV × Voltage

Worked example

  1. 1.Inputs: 2300 KV, 14.8 V.
  2. 2.RPM = 2300 × 14.8 = 34,040 theoretical no-load.

Assumptions and limits

  • Real loaded RPM is always lower.
  • Use it to compare motors, not to promise a shaft speed.

Related tools

Guides and concepts

FAQ

Why is my measured RPM lower?

Load, sagging voltage and efficiency all pull real RPM below the theoretical figure.

Assumptions

  • Theoretical no-load RPM only.
  • No efficiency or load model applied.