kVA to Ohms Calculator

Summary

Convert apparent power in kilovolt-amperes (kVA) to resistance in ohms (Ω) for single-phase and three-phase systems.

How it works

1. Enter the apparent power in kilovolt-amperes (kVA).
2. Enter the supply voltage in volts (V). For three-phase, enter line-to-line voltage.
3. Select single-phase or three-phase (3-phase balanced).
4. The calculator applies R = V² / (kVA × 1000). For a three-phase wye load with line-to-line voltage, the factor of 3 in voltage and power cancels, so the same formula gives the per-phase resistance.
5. Results appear instantly with the resistance value in ohms.

Use cases

• Size protective resistors for electrical panels and transformers.
• Estimate impedance of generators and UPS systems rated in kVA.
• Cross-check resistance values in switchgear design.
• Validate load calculations for single-phase and three-phase circuits.
• Educational use for understanding the relationship between power, voltage, and resistance.

Frequently Asked Questions