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HP to Watts: Conversion Formula, Examples, and Quick Table
HP to Watts: Conversion Formula, Examples, and Quick Table
Power ratings can feel confusing when one product lists horsepower and another lists watts. If you are comparing a garage compressor, sump pump, shop saw, inverter, or backup battery, converting HP to watts gives you one common number to work with.
In this guide, you’ ll learn the simple formula, see practical examples, and understand why motor output is not always the same as electrical power drawn from a wall outlet. The focus is on clear, everyday calculations for Canadian homeowners, DIYers, and equipment buyers.
Quick Answer
One mechanical horsepower (HP) equals approximately 745.7 watts, commonly rounded to 746 W. To convert HP to watts, multiply the horsepower value by 745.7. To convert watts to HP, divide watts by 745.7. For example, a 2 HP motor produces about 1,491 watts of mechanical power. However, when sizing electrical systems, remember that motors may draw more watts than their HP rating due to efficiency losses and startup surge.
Horsepower and Watts Explained
Horsepower and watts both measure power, meaning the rate at which work is done or energy is transferred. Horsepower is common for mechanical equipment, while watts are standard for electrical devices.
Horsepower as mechanical power
Horsepower is often used to describe the output of engines, electric motors, pumps, compressors, shop tools, and machinery. In practical terms, it helps show how much mechanical work a device can deliver at a shaft, blade, pump, or drive system.
Watt as the SI unit of power
A watt is the SI unit of power and measures the rate of energy transfer. Watts appear on appliances, electrical devices, inverters, battery systems, chargers, and power stations, making them useful for estimating electrical demand and energy planning.
How Do You Convert HP to Watts?
To convert horsepower into watts, use the standard mechanical horsepower value. The conversion of HP to watt is straightforward when you know whether the rating is mechanical horsepower or another type.
HP to watts formula
The standard formula is:
Watts = HP × 745.7
For most motors and machinery sold in North America, this is the conversion you’ ll use. For example, 2 HP × 745.7 = 1,491.4 W.
Step-by-step conversion method
Use this quick method whenever you need a clean estimate:
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Find the horsepower value.
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Multiply it by 745.7.
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Round the answer if an estimate is enough.
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Divide by 1000 if you need kilowatts.
Example calculations
Here are common mechanical horsepower conversions:
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0.5 HP × 745.7 = 372.85 W
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1 HP × 745.7 = 745.7 W
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2 HP × 745.7 = 1,491.4 W
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3 HP × 745.7 = 2,237.1 W
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5 HP × 745.7 = 3,728.5 W
How Do You Convert from Watt to HP?
You convert from watt to HP by reversing the formula. This is useful when equipment is rated in watts but you want to compare it with a motor, engine, pump, or tool listed in horsepower.
Watts to horsepower formula
The watts to horsepower formula is:
HP = Watts ÷ 745.7
This works for mechanical horsepower. If a product uses metric horsepower, the result will be slightly different, but this formula is the usual choice in Canadian and North American equipment comparisons.
Reverse conversion examples
Here are quick reverse conversions:
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746 W ÷ 745.7 ≈ 1 HP
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1500 W ÷ 745.7 ≈ 2.01 HP
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2000 W ÷ 745.7 ≈ 2.68 HP
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3000 W ÷ 745.7 ≈ 4.02 HP
HP to Watts Conversion Table and Examples
This HP to watts conversion table is a quick reference for comparing motors, pumps, shop tools, compressors, inverters, and electrical power sources without doing the math each time.
Common HP to watts conversion table
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Horsepower
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Watts
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0.25 HP
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186.4 W
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0.5 HP
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372.9 W
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0.75 HP
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559.3 W
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1 HP
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745.7 W
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1.5 HP
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1,118.6 W
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2 HP
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1,491.4 W
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|
3 HP
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2,237.1 W
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5 HP
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3,728.5 W
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|
7.5 HP
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5,592.8 W
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10 HP
|
7,457 W
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Kilowatt equivalents for common motor sizes
One horsepower is about 0.746 kW. That makes 2 HP approximately 1.49 kW, 3 HP approximately 2.24 kW, and 5 HP approximately 3.73 kW. Kilowatts are especially handy when comparing larger motors or power system ratings.
Mechanical vs Metric Horsepower
Some sources show 746 W for horsepower, while others show 735.5 W. The difference comes from the type of horsepower being used, not from an error in basic power conversion.
Mechanical horsepower
Mechanical horsepower is commonly used for motors, engines, and machinery in North America. It equals about 745.7 W and is often rounded to 746 W. Unless a Canadian product label says otherwise, this is usually the correct assumption.
Metric horsepower
Metric horsepower is often shown as PS or cv and equals about 735.5 W. You may see it on imported vehicles, European equipment, or international product specifications. It is close to mechanical horsepower but not exactly the same.
How Much Power Does a 1 HP Motor Actually Use?
A unit conversion is not the same as real electrical consumption. A 1 HP motor may deliver about 746 W of mechanical output, but its input draw depends on efficiency, load, voltage, and startup demand.
Output power versus input power
Horsepower often describes mechanical output. The power drawn from the outlet is usually higher because motors lose energy as heat, friction, and electrical losses. A 1 HP motor may consume more than 746 W while operating.
Motor efficiency and startup surge
Motors can draw much more power for a moment at startup. Pumps, compressors, saws, and refrigeration motors often need a surge above their running watts. This matters when sizing breakers, inverters, generators, or backup batteries.
Checking the nameplate rating
Always check the manufacturer nameplate before sizing circuits or backup power. Look for volts, amps, watts, running watts, starting watts, phase, and duty rating. For safety-critical installations, consult a licensed electrician in your province or territory.
Best Backup Power in Canada for Motors and High-Power Devices
When converting HP to watts, remember that many motors need extra startup power beyond their normal running demand. For Canadian homes, cottages, and workshops, a backup system should be sized using both running watts and surge watts. Portable power stations can provide a quieter alternative to fuel generators for selected appliances, tools, pumps, and essential devices.
Anker SOLIX C2000 Gen 2 Portable Power Station
The Anker SOLIX C2000 Gen 2 Portable Power Station is designed for higher-demand backup applications where power output and expandability matter. It delivers 2,400W rated power and 4,000W peak power, helping support compatible motor-driven devices and appliances. With expansion up to 4kWh, six recharge methods, and fast AC plus solar charging, it is suitable for homes, workshops, and off-grid use.
Anker SOLIX S2000 Portable Power Station
The Anker SOLIX S2000 Portable Power Station is a practical option for lighter backup needs, including electronics, small appliances, and selected equipment. It provides 2,010Wh capacity, 1,500W AC output, and up to 10,000 cycles for long-term reliability. With ≤10ms UPS switching, 400W solar input, and a 35.7 lb design, it offers portable backup power for homes, vehicles, and outdoor setups.
Conclusion
Converting HP to watts is simple: multiply horsepower by 745.7 for mechanical horsepower. That one calculation makes it easier to compare motors, pumps, tools, inverters, and backup systems using a shared unit.
For real-world decisions, don’ t stop at the conversion. Check the nameplate for input watts, running watts, and starting watts before sizing a circuit or backup power source. The formula gives you a helpful baseline, while the manufacturer rating tells you what the equipment actually needs.
FAQs
Is 1 HP equal to 1000 watts?
No, 1 HP is not 1000 W. One mechanical horsepower is about 745.7 W, commonly rounded to 746 W. By comparison, 1000 W is about 1.34 HP using the mechanical horsepower formula.
Is 1 HP 735 W or 746 W?
Mechanical horsepower is about 746 W, while metric horsepower is about 735.5 W. If you are converting 1 HP to watts for North American motors and machinery, 745.7 W is usually the correct value. Imported equipment may use PS or cv.
How many watts is a 1 HP motor?
A 1 HP motor delivers about 746 W of mechanical output. Its electrical input can be higher because of motor efficiency, load, and power factor. Always check the label for actual volts, amps, and rated input power.
How many HP is 1500 watts?
1500 W is about 2.01 HP using the mechanical horsepower formula. The calculation is 1500 ÷ 745.7 = 2.01. This is useful when comparing watt-rated equipment with a horsepower-rated motor or engine.
How many HP is 2000 watts?
2000 W is about 2.68 HP. The calculation is 2000 ÷ 745.7 = 2.68. For motor comparisons, remember that real input draw and startup surge may differ from the simple unit conversion.
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