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Engineering power converter for watts, kilowatts, megawatts, mechanical horsepower (hp), metric horsepower (PS), and BTU per hour.
Unit
Generated on May 23, 2026
Engineering power converter for watts, kilowatts, megawatts, mechanical horsepower (hp), metric horsepower (PS), and BTU per hour.
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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