HP to kVA Calculator

Convert HP to kVA for generator and transformer sizing. Includes power factor and motor efficiency.

HP

APPARENT POWER

9.75 kVA

WATTS

7,460 W

FORMULA

kVA=(HPร—746)/(PFร—Effร—1000)

๐Ÿ’ก How to Convert HP to kVA

Formula

kVA = (HP ร— 746) / (PF ร— Eff ร— 1,000)

Example: 10 HP motor, PF=0.85, Eff=90%:
kVA = (10 ร— 746) / (0.85 ร— 0.9 ร— 1,000) = 9.75 kVA

When sizing a generator for a motor, add 25-50% for starting surge (motors draw 5-7ร— their rated current during startup).

10 HP motor needs ~9.75 kVA running + 25-50% for starting surge.

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