Electrical Calculator — No. 02

HP to kW
Calculator

Horsepower se Kilowatt nikalo — Mechanical, Electrical aur Metric HP. Motor nameplate padhna ho ya generator size karna ho, yeh tool must-have hai.

Calculator
HP Type Select Karo
Motor ya engine ka HP value
Valid HP value > 0 chahiye
Kitne motors (optional)
1 ya zyada chahiye
Result — Power in Kilowatts
—kW
HP Input
—HP
Per unit
Total kW
—kW
All units
Approx kVA
—kVA
÷ 0.85 PF
Suggested Generator
—
25% starting
factor included
Theory + Site Knowledge

HP to kW — Kya Hai Aur Kyun Zaroori Hai?

Bhai, Gulf ki har site pe — chahe Qatar University ho, Sidra Hospital ho ya Al Daayen Hospital — motor ka nameplate mostly HP (Horsepower) mein hota hai. Lekin jab cable sizing karo, MCB select karo, ya generator size karo — toh kW (Kilowatt) chahiye. Main Arif hoon, 12+ saal ka Gulf experience hai. Maine dekha hai naaye electricians HP dekh ke directly cable laga dete hain — bina kW calculate kiye. Result? Wrong cable size, generator overload, aur site supervisor ki daant.

Mechanical HP Formula

kW = HP × 0.7457
Gulf sites pe sabse common — motors, pumps, fans
1 Mechanical HP = 745.7 Watts

Electrical HP Formula

kW = HP × 0.7460
US electrical motors, generators
1 Electrical HP = 746 Watts

Metric HP (PS) Formula

kW = HP × 0.7355
Europe, India ke older motors
1 Metric HP = 735.5 Watts

Kaunsa HP Type Use Karein?

Gulf site pe jab nameplate mein sirf “HP” likha ho — hamesha Mechanical HP (×0.7457) assume karo. Yahi industry standard hai Qatar, UAE, Saudi mein. Agar “HP(E)” likha ho toh Electrical HP. European machinery mein “PS” ya “CV” likha ho toh Metric HP.

Sidra Hospital Qatar — Real Example

Motor: 15 HP mechanical — chiller unit pump

kW = 15 × 0.7457 = 11.19 kW

FLC = 11190 / (1.732 × 415 × 0.85) = 18.33 A

Cable: 4mm² XLPE | MCB: 25A C-curve

Al Daayen Hospital — Multiple Motors

4 × 5 HP pumps, Mechanical HP

Total kW = (4 × 5) × 0.7457 = 14.91 kW

kVA = 14.91 ÷ 0.8 PF = 18.64 kVA

Generator: 18.64 × 1.25 = 23.3 kVA → Select 25 kVA

HP to kW Quick Reference Table

HP (Mech.)kWTypical UseCable (415V, 3Ph)
0.5 HP0.373 kWSmall fan, pump1.5 mm²
1 HP0.746 kWDomestic pump1.5 mm²
2 HP1.49 kWSmall compressor1.5 mm²
5 HP3.73 kWWater pump2.5 mm²
10 HP7.46 kWHVAC fan, chiller4 mm²
15 HP11.19 kWLarge pump6 mm²
20 HP14.91 kWIndustrial motor10 mm²
30 HP22.37 kWCompressor, crane16 mm²
50 HP37.28 kWHeavy industry25 mm²
100 HP74.57 kWLarge industrial50 mm²

* IEC 60364. Site conditions ke hisaab se verify karo.

Generator Sizing mein HP kaise use karein

Gulf site pe backup generator size karte waqt — sab motors ki HP values ka kW nikaalo, phir total kW ko PF se divide karo kVA milega. Starting surge ke liye 25% extra add karo. Example: 50 HP = 37.28 kW ÷ 0.8 = 46.6 kVA × 1.25 = 58.25 kVA → 60 kVA generator select karo.

⚠️ Motor efficiency (η) ko ignore mat karo! Real current: I = (kW × 1000) / (√3 × V × PF × η). Nameplate FLA hamesha override karta hai calculated value — cable sizing mein hamesha nameplate FLA use karo.
Related Calculators:
kW to Amp Calculator | Cable Size Calculator | Voltage Drop Calculator | Power Factor Calculator | Motor Starting Current | Ohm’s Law Calculator
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Star Delta Wiring Guide | VFD Maintenance Guide | DB PPM Procedure | Read Electrical Drawings | Gulf Interview Questions

Frequently Asked Questions

Mechanical HP = 0.7457 kW — Gulf sites pe sabse common. Electrical HP = 0.746 kW. Metric HP = 0.7355 kW. Jab nameplate mein sirf “HP” likha ho toh Mechanical HP assume karo.
10 HP Mechanical = 7.46 kW. 415V 3-phase, PF 0.85 pe FLC = 12.21 A. Design current = 15.26 A. Cable: 2.5mm² XLPE. MCB: 16A Type C. Detailed sizing ke liye Cable Size Calculator use karo.
Sirf 0.3 W per HP ka difference — practically negligible. Agar nameplate mein sirf “HP” likha ho → Mechanical (0.7457). “HP(E)” likha ho → Electrical (0.746). Gulf sites pe always Mechanical assume karo jab tak otherwise specify na ho.
(1) HP × 0.7457 = kW → (2) kW ÷ 0.8 PF = kVA → (3) kVA × 1.25 starting factor. Example: 50 HP = 37.28 kW ÷ 0.8 = 46.6 kVA × 1.25 = 58.25 kVA → Select 60 kVA generator.
HP = kW ÷ 0.7457 (Mechanical). Example: 5.5 kW = 7.38 HP. Amp calculate karne ke liye check karein kW to Amp Calculator.
VoltGuru.in — HP to kW Calculator — IEC 60034 Compliant / Free for Gulf Electricians