AutoEngCalc - Engineering Calculators

VFD Output Frequency Calculator

Calculate required VFD output frequency for desired motor speed. Includes synchronous speed, slip compensation, and actual RPM for induction motors.

Output Frequency
60.0 Hz
1800 RPM • 4 poles • 0% slip

VFD Frequency & Speed

Featured: Hz • RPM • Poles • Slip

0% for synchronous, 2–5% typical
Usually 50 or 60 Hz

Speed vs Frequency

V/f constant torque region

Key Formulas
Synchronous RPM = (120 × f) / P
Actual RPM = Synchronous × (1 - slip/100)
Required f = (Desired RPM × P) / (120 × (1 - slip/100))

Enter parameters to calculate

VFD & Motor Guidelines

Common Speeds

2 poles: ~3600 RPM (60 Hz)

4 poles: ~1800 RPM

6 poles: ~1200 RPM

8 poles: ~900 RPM

Slip Compensation

No load: ~0% slip

Full load: 2–5% slip

VFD boosts freq to maintain speed

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