With this tool you can convert online from kVA to Hp automatically, easily, quickly and free.
For greater ease we explain that formula is used for the calculation and a table with the main conversions of kVA to Hp.
We also show the most common power factors of different constructions, appliances and motors, in addition to the most common efficiency values of the latter.
Definition P.F, S (kva), Motor Efficiency and H.P (horsepower):
H.P: The horsepower (hp) is a unit in the foot-pound-second ( fps ) or English system, sometimes used to express the rate at which mechanical energy is expended. It was originally defined as 550 foot-pounds per second (ft-lb/s). Defined by James Watt (1736-1819) the inventor of first practical steam engine.
A power level of 1 hp is approximately equivalent to 746 watt s (W) or 0.746 kilowatt s (kW).
kVA: A kilovolt-ampere, commonly referred to as a kVA, is commonly used as a unit of power in obtaining the electrical capacity of circuit breakers, uninterrupted power supplies and wirings.
KVA is larger than KW because loads are inductive such as motors, discharge lighting, reactors and more current is required to keep the magnetic field energized than is -turned into heat (KW).
Inductive devices or loads such,. as tansformers and motors having power factor less than 1.0 are generally rated in KVA.
Motor Efficiency: Electric motor efficiency is the ratio between power output (mechanical) and power input (electrical). Mechanical power output is calculated based on the torque and speed required (i.e. power required to move the object attached to the motor), and electrical power input is calculated based on voltage and current supplied to the motor. Mechanical power output is always lower than the electrical power input, as energy is lost during conversion (electrical to mechanical) in various forms, such as heat and friction. Design of an electric motor aims to minimize these losses to improve efficiency.
P.f: Power factor is the ratio of working power to apparent power. It measures how effectively electrical power is being used. A high power factor signals efficient utilization of electrical power, while a low power factor indicates poor utilization of electrical power.
Power Factor is the cosine of the phase angle between current and voltage.
Power Factor is the ratio of true power to apparent power.
kVA to Hp calculation formula:
Typical Un-improved Power Factor by Industry:
| Industry | Power Factor |
| Auto Parts | 0.75-0.80 |
| Brewery | 0.75-0.80 |
| Cement | 0.80-0.85 |
| Chemical | 0.65-0.75 |
| Coal Mine | 0.65-0.80 |
| Clothing | 0.35-0.60 |
| Electroplating | 0.65-0.70 |
| Foundry | 0.75-0.80 |
| Forging | 0.70-0.80 |
| Hospital | 0.75-0.80 |
| Machine Manufacturing | 0.60-0.65 |
| Metalworking | 0.65-0.70 |
| Office Building | 0.80-0.90 |
| Oil field Pumping | 0.40-0.60 |
| Paint Manufacturing | 0.65-0.70 |
| Plastic | 0.75-0.80 |
| Stamping | 0.60-0.70 |
| Steel Works | 0.65-0.80 |
| Tool, dies, jigs industry | 0.65-0.75 |
Typical power factor of common household electronics:
| Electronics device | Power Factor |
| Magnavox Projection TV – standby | 0,37 |
| Samsung 70″ 3D Bluray | 0,48 |
| Digital Picture Frame | 0,52 |
| ViewSonic Monitor | 0,5 |
| Dell Monitor | 0,55 |
| Magnavox Projection TV | 0,58 |
| Digital Picture Frame | 0,6 |
| Digital Picture Frame | 0,62 |
| Digital Picture Frame | 0,65 |
| Philips 52″ Projection TV | 0,65 |
| Wii | 0,7 |
| Digital Picture Frame | 0,73 |
| Xbox Kinect | 0,75 |
| Xbox 360 | 0,78 |
| Microwave | 0,9 |
| Sharp Aquos 3D TV | 0,95 |
| PS3 Move | 0,98 |
| Playstation 3 | 0,99 |
| Element 41″ Plasma TV | 0,99 |
| Current large, flat-screen television | 0,96 |
| Windows-mount air conditioner | 0,9 |
| Legacy CRT-Based color television | 0,7 |
| Legacy flat panel computer monitor | 0,64 |
| While-LED lighting fixture | 0,61 |
| Legacy laptop power adapter | 0,55 |
| Laser Printer | 0,5 |
| Incandescent lamps | 1 |
| Fluorescent lamps (uncompensated) | 0,5 |
| Fluorescent lamps (compensated) | 0,93 |
| Discharge lamps | 0,4-0,6 |
Typical Motor Power Factors:
| Power | Speed | Power Factor | ||
| (hp) | (rpm) | 1/2 load | 3/4 load | full load |
| 0 – 5 | 1800 | 0.72 | 0.82 | 0.84 |
| 5 – 20 | 1800 | 0.74 | 0.84 | 0.86 |
| 20 – 100 | 1800 | 0.79 | 0.86 | 0.89 |
| 100 – 300 | 1800 | 0.81 | 0.88 | 0.91 |
Reference // Power Factor in Electrical Energy Management-A. Bhatia, B.E.-2012
Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014
http://www.engineeringtoolbox.com
NEMA Design B Electrical Motors Efficiency
Electrical motors constructed according NEMA Design B must meet the efficiencies below:
| Power (hp) |
Minimum Nominal Efficiency1) |
|---|---|
| 1 – 4 | 78.8 |
| 5 – 9 | 84.0 |
| 10 – 19 | 85.5 |
| 20 – 49 | 88.5 |
| 50 – 99 | 90.2 |
| 100 – 124 | 91.7 |
| > 125 | 92.4 |
1) NEMA Design B, Single Speed 1200, 1800, 3600 RPM. Open Drip Proof (ODP) or Totally Enclosed Fan Cooled (TEFC) motors 1 hp and larger that operate more than 500 hours per year.
kVA to Hp conversion table:
| kVA | Efficiency | P.f | Hp |
| 1 kVA | 78% | 0,84 P.f | 0,87 Hp |
| 2 kVA | 78% | 0,84 P.f | 1,75 Hp |
| 3 kVA | 78% | 0,84 P.f | 2,63 Hp |
| 4 kVA | 84% | 0,84 P.f | 3,51 Hp |
| 5 kVA | 84% | 0,84 P.f | 4,39 Hp |
| 6 kVA | 84% | 0,86 P.f | 5,39 Hp |
| 7 kVA | 84% | 0,86 P.f | 6,29 Hp |
| 8 kVA | 84% | 0,86 P.f | 7,19 Hp |
| 9 kVA | 90% | 0,86 P.f | 8 Hp |
| 10 kVA | 90% | 0,86 P.f | 8,99 Hp |
| 20 kVA | 92% | 0,86 P.f | 17,98 Hp |
| 30 kVA | 92% | 0,89 P.f | 27,91 Hp |
| 40 kVA | 92% | 0,89 P.f | 37,22 Hp |
| 50 kVA | 92% | 0,89 P.f | 46,52 Hp |
| 60 kVA | 92% | 0,89 P.f | 55,83 Hp |
| 70 kVA | 92% | 0,89 P.f | 65,13 Hp |
| 80 kVA | 92% | 0,89 P.f | 74,4 Hp |
| 90 kVA | 92% | 0,89 P.f | 83,75 Hp |
| 100 kVA | 92% | 0,89 P.f | 93,05 Hp |
| 200 kVA | 92% | 0,91 P.f | 190,2 Hp |
| 300 kVA | 92% | 0,91 P.f | 285,4 Hp |
| 400 kVA | 92% | 0,91 P.f | 380,5 Hp |
| 500 kVA | 92% | 0,91 P.f | 475,73 Hp |
| 600 kVA | 92% | 0,91 P.f | 570,88 Hp |
| 700 kVA | 92% | 0,91 P.f | 666,03 Hp |
| 800 kVA | 92% | 0,91 P.f | 761,1 Hp |
| 900 kVA | 92% | 0,91 P.f | 856,3 Hp |
| 1000 kVA | 92% | 0,91 P.f | 951,47 Hp |
| 1100 kVA | 92% | 0,91 P.f | 1046,62 Hp |
| 1200 kVA | 92% | 0,91 P.f | 1141,76 Hp |
| 1300 kVA | 92% | 0,91 P.f | 1236,9 Hp |
| 1400 kVA | 92% | 0,91 P.f | 1332,06 Hp |
| 1500 kVA | 92% | 0,91 P.f | 1427,21 Hp |
| 1600 kVA | 92% | 0,91 P.f | 1522,359 Hp |
| 1700 kVA | 92% | 0,91 P.f | 1617,5 Hp |
| 1800 kVA | 92% | 0,91 P.f | 1712,65 Hp |
