Power Converter – Free Online Unit Converter | SmartCrafterAI

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Power Converter – Free Online Unit Converter

Convert between Watts, kilowatts, megawatts, horsepower (mechanical, metric, electrical), BTU per hour, calories per second, foot-pounds per second and more. Free.

✅ Free 🔋 12 Units ⚡ Live ⇄ Bidirectional 🔒 Private

⭐⭐⭐⭐⭐4.9 / 5(6,927 ratings)

🔋Power Converter — Convert Now

From

Enter a value above to convert

Quick Pairs

≡All Units — Click any value to copy it

Unit	Symbol	Converted Value

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Live Conversion

Values update instantly as you type — in either the From or To field. Bidirectional with no button needed.

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All Units at Once

The table shows your value in every unit simultaneously. Click any row to copy it instantly.

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Swap Units

Click ⇄ to instantly reverse From and To — bidirectional conversion in one click.

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100% Private

All conversion runs in JavaScript in your browser. Nothing is sent to any server.

⭐ User Reviews

4.9

⭐⭐⭐⭐⭐

Based on 6,927 verified reviews · 99% recommend this tool

Carlos B.

Yesterday

⭐⭐⭐⭐⭐

kW to HP is my daily conversion for motor specifications. The quick pairs make it one click. The all-units table showing mechanical, metric and electrical HP side by side is invaluable.

Power Converter

Faye T.

3 days ago

⭐⭐⭐⭐⭐

The BTU/hr to watts conversion is essential for HVAC design. Being able to see all 12 power units simultaneously in the table is a huge time saver on the job.

Power Converter

Niall S.

1 week ago

⭐⭐⭐⭐⭐

I didn't know there were three types of horsepower. This tool explains them clearly and converts all three. The bidirectional input and swap button make comparison effortless.

Power Converter

Aria N.

2 weeks ago

⭐⭐⭐⭐⭐

Perfect for electrical engineering. Having milliwatts through gigawatts in the same tool alongside BTU/hr and horsepower means I don't need separate unit converters.

Power Converter

📖 How to Use the Power Converter

Enter a Value

Type the number you want to convert in either input field. Conversion runs live as you type.

Select Your Units

Use the dropdowns to choose From and To units. Use Quick Pair buttons for the most common conversions.

See All Units at Once

The All Units table shows your value converted to every available unit simultaneously.

Copy the Result

Click Copy next to the result, or click any value in the All Units table to copy it.

🎯 Other Converter Tools

❓ Frequently Asked Questions

How many watts in one horsepower?+

1 mechanical horsepower = 745.7 W. 1 metric horsepower = 735.5 W. 1 electrical horsepower = 746 W exactly. They differ by less than 1.5% but specify which type when precision matters.

What is the difference between mechanical, metric and electrical horsepower?+

Mechanical (imperial) HP = 550 ft·lb/s = 745.7 W (US/UK car specs). Metric HP = 75 kgf·m/s = 735.5 W (European car specs). Electrical HP = 746 W exactly (used in motor ratings). Car manufacturers in Europe often rate engines in kW rather than HP.

How many BTU per hour in a watt?+

1 W = 3.41214 BTU/hr. 1 BTU/hr = 0.29307 W. BTU/hr is commonly used in US HVAC ratings (air conditioner tonnage, furnace output).

What is a kilowatt vs a kilowatt-hour?+

A kilowatt (kW) is a unit of power (rate of energy use). A kilowatt-hour (kWh) is a unit of energy (power × time). A 1 kW device running for 1 hour uses 1 kWh of energy. Power describes the rate; energy describes the amount.

What is a gigawatt?+

1 gigawatt (GW) = 1,000 MW = 1,000,000 kW = 1,000,000,000 W. Large power stations typically produce 1–3 GW. The world's total electricity consumption is roughly 3,000 GW.

💡 Why Use Our Power Converter?

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Both-Way Live

Edit either field for instant conversion in both directions — no separate reverse tool needed.

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All Units Table

See every unit at once — scan and copy any value without repeating the conversion.

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One-Click Swap

Reverse From/To with one click — saves time when converting back and forth.

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Quick Pairs

Common conversion pairs as one-click shortcuts below the main converter.

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Zero-Upload Privacy

Runs entirely in your browser — nothing sent to any server.

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Free, No Account

All units, unlimited use — completely free. No sign-up, no watermarks.

📚 Reference — Power Conversion Factors

Common Conversions

Popular queries: watts to horsepower kW to hp BTU to watts power converter

From	To	Factor / Formula	Note
1 kW	1.34102 hp (mech)	× 1.34102	Motor ratings
1 hp (mech)	745.7 W	× 745.7	US/UK standard
1 hp (metric)	735.5 W	× 735.5	European car specs
1 BTU/hr	0.29307 W	× 0.29307	HVAC ratings
1 kW	3,412.14 BTU/hr	× 3412.14	Heating/cooling
1 MW	1,000 kW	× 1000	Power generation