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Power Converter — Engineering power converter for watts, kilowatts, megawatts, mechanical horsepower (hp), metric horsepower (PS), and BTU per hour.
1 Horsepower (mechanical) = 745.7 Watts
1 hp = 745.7 WUnit
Generated on May 24, 2026
A power converter moves between watts, kilowatts, horsepower, metric horsepower (PS), and BTUs per hour. Power is the rate of energy use — 1 watt is 1 joule per second. Electronics are rated in watts, cars in horsepower, air conditioners in BTU/hr, and power stations in megawatts.
Formula
All conversions route through watts. 1 kW = 1,000 W. 1 hp (mechanical) = 745.7 W. 1 PS (metric) = 735.5 W. 1 BTU/hr = 0.293 W.Power conversion shows up most often in three specific moments for Pakistani users. First: you're sizing an inverter or UPS for the next K-Electric load-shedding cycle, and you need to add up your appliance wattages — which means knowing that a "1.5 ton AC" pulls about 1,500-1,800 watts of electricity, even though it delivers 5,270 watts (5.27 kW) of cooling. Second: you're shopping for a generator or solar system and the catalogues quote kW, kVA, hp, and BTU/hr interchangeably, all describing the same physical thing at different scales. Third: you're reading an imported car brochure and the spec sheet says "150 PS" while local marketing says "148 hp" — same engine, just metric horsepower (735.5W) versus mechanical horsepower (745.7W). The watt is the SI base, every other unit converts cleanly through it. Pro tip: when matching an AC to your room size in Pakistan, use the rule of 600 BTU/hr per 100 sq ft as a starting point, then add 20-30 percent for west-facing rooms or top-floor exposure. Undersizing means the AC runs constantly without cooling enough; oversizing means it cycles on-off frequently and wastes electricity. K-Electric's tier-3 tariff (above 700 units) is brutal — sizing the AC correctly the first time saves PKR 5,000-10,000 over a summer.
A power converter moves between watts, kilowatts, horsepower, metric horsepower (PS), and BTUs per hour. Power is the rate of energy use — 1 watt is 1 joule per second. Electronics are rated in watts, cars in horsepower, air conditioners in BTU/hr, and power stations in megawatts. Being able to translate between these is crucial when comparing a Japanese car's 150 PS to an American car's 148 hp, sizing an air conditioner by BTU/hr when only kilowatts are quoted, or planning a solar installation in kW vs. the family's 200 W appliance load.
Power is work per unit time, with the watt as the SI base. James Watt defined mechanical horsepower in 1782 to market his steam engine by comparison with a draft horse — his figure was 33,000 ft-lb per minute, which equals 745.7 W. Metric horsepower (PS, Pferdestärke) uses kilogram-meters instead, producing a slightly smaller 735.5 W. For heating and cooling equipment, the BTU per hour is standard in the US and UK; 3,412 BTU/hr equals exactly 1 kW of thermal power.
Common power-unit conversions for appliances, motors, and electrical systems.
| Watts (W) | Kilowatts (kW) | Horsepower (hp) | BTU/hr |
|---|---|---|---|
| 100 | 0.1 | 0.134 | 341 |
| 500 | 0.5 | 0.671 | 1,706 |
| 1000 | 1 | 1.341 | 3,412 |
| 1500 | 1.5 | 2.012 | 5,118 |
| 2000 | 2 | 2.682 | 6,824 |
| 5000 | 5 | 6.706 | 17,061 |
| 10000 | 10 | 13.41 | 34,121 |
| 100000 | 100 | 134.1 | 341,214 |
1 horsepower (746 W) is about the continuous output of a strong horse — or a small window AC unit.
An LED bulb draws 10 W; a traditional incandescent draws 60 W for the same brightness.
A 1,500 W hair dryer uses the same power as a small space heater — both draw ~7 amps on 220 V.
A Tesla Model S motor peaks at ~750 kW — the power of a 1,000-horse cavalry charge, in one car.
A 100-horsepower car engine delivers about 74.57 kW — the typical output of a small sedan.
A 12,000 BTU/hr air conditioner (colloquially '1 ton of cooling') is roughly 3.5 kW — enough for a 350–450 sq ft room.
1 megawatt (1 MW) equals 1,000 kW, the kind of rating used for wind turbines and medium-scale solar farms.
A 1.5 horsepower water pump motor draws about 1,119 W — useful for sizing a generator or UPS.
An iPhone wall charger is rated about 20 W; a laptop charger 65–100 W; a microwave oven 1,000 W.
The Tesla Model S Plaid delivers up to 1,020 horsepower (about 760 kW) — equivalent to the power of over a thousand home microwaves running at once.
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