Free Power Converter - Convert kW, hp, W, BTU/h & More Instantly
Need to convert power between different units? Our free power converter gives you instant answers. Just enter your value and choose your units – and see the result instantly. Whether you need to convert Kilowatts to Horsepower, Watts to BTU/h, or Megawatts to Kilowatts, this tool handles it all. Perfect for engineers, electricians, mechanics, and students. Everything stays in your browser – 100% private, no sign-up required.
A power converter is a tool that converts power measurements between units including Watts, Kilowatts, Megawatts, Horsepower, BTU/h, and Ton of Refrigeration using precise conversion factors.
- 12+ Power Units:
Supports W, kW, MW, GW, Horsepower (Metric, mechanical, electrical), BTU/h, ft·lb/s, cal/s, kcal/h, and Ton of Refrigeration. - Common References:
Light Bulb = 60 W. Car Engine = 100-300 hp. Air Conditioner = 1-2 TR (3.5-7 kW). Power Plant = 500-1000 MW. - Power vs Energy:
Power is the rate of energy transfer (Watts), while Energy is the total amount (Joules or Watt-hours). - Privacy:
All conversions happen 100% in your browser. No data is ever sent to any server.
What is a Power Converter and How Does It Work?
A power converter is a practical tool that transforms power measurements from one unit to another. Power is the rate at which energy is transferred or converted, measured in various units including Watts (W), Kilowatts (kW), Horsepower (hp), BTU per hour (BTU/h), and Ton of Refrigeration (TR).
Our free power converter supports 12+ power units with precise conversion factors:
Watt (W): SI unit of power
Kilowatt (kW): 1,000 Watts
Megawatt (MW): 1,000,000 Watts
Gigawatt (GW): 1,000,000,000 Watts
Horsepower (hp): 745.699872 Watts (mechanical)
Horsepower Metric (hp(M)): 735.49875 Watts
Horsepower Electrical (hp(E)): 746 Watts
BTU per Hour (BTU/h): 0.293071 Watts
Foot-Pound per Second (ft·lb/s): 1.35582 Watts
Calorie per Second (cal/s): 4.1868 Watts
Kilocalorie per Hour (kcal/h): 1.163 Watts
Ton of Refrigeration (TR): 3,516.85 Watts
Key Benefits of This Power Converter:
12+ Units: Covers all common power units
Precise Factors: Accurate conversion factors
Visual Comparison: Bar chart showing relative values
Step-by-Step Solutions: See every calculation step
Quick Presets: Common conversions at your fingertips
Calculation History: Stores last 50 conversions
Privacy First: 100% client-side processing
How to Use the Free Power Converter Tool
Using this online power converter is incredibly simple:
Step 1 – Enter Value
Type the number you want to convert.
Step 2 – Select From Unit
Choose the unit you’re converting from.
Step 3 – Select To Unit
Choose the unit you’re converting to.
Step 4 – View Results
The result appears instantly with step-by-step solution and visual comparison.
Step 5 – Use Quick Presets (Optional)
One-click for common conversions:
1 kW → hp: Kilowatt to Horsepower
1 hp → W: Horsepower to Watt
1 MW → kW: Megawatt to Kilowatt
1 W → BTU/h: Watt to BTU per hour
1 TR → kW: Ton of Refrigeration to Kilowatt
1 GW → MW: Gigawatt to Megawatt
Step 6 – Swap Units (Optional)
Click “Swap” to reverse the from and to units.
Step 7 – Copy or Reset
Click “Copy Details” to copy all data
Click “Clear” to reset all inputs
Complete Power Conversion Examples with Tables
Example 1: Kilowatt to Horsepower – 1 kW to hp
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 kW × (1 hp / 0.745699872 kW) | – |
| 2 | 1 / 0.745699872 | 1.34102 |
Final Answer: 1 kW = 1.34102 hp
Example 2: Horsepower to Watt – 1 hp to W
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 hp × (745.699872 W / 1 hp) | – |
| 2 | 1 × 745.699872 | 745.7 |
Final Answer: 1 hp = 745.7 W
Example 3: Megawatt to Kilowatt – 1 MW to kW
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 MW × (1000 kW / 1 MW) | – |
| 2 | 1 × 1000 | 1000 |
Final Answer: 1 MW = 1000 kW
Example 4: Watt to BTU/h – 1 W to BTU/h
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 W × (1 BTU/h / 0.293071 W) | – |
| 2 | 1 / 0.293071 | 3.41214 |
Final Answer: 1 W = 3.41214 BTU/h
Example 5: Ton of Refrigeration to kW – 1 TR to kW
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 TR × (3.51685 kW / 1 TR) | – |
| 2 | 1 × 3.51685 | 3.51685 |
Final Answer: 1 TR = 3.51685 kW
Example 6: Gigawatt to Megawatt – 1 GW to MW
| Step | Calculation | Result |
|---|---|---|
| 1 | 1 GW × (1000 MW / 1 GW) | – |
| 2 | 1 × 1000 | 1000 |
Final Answer: 1 GW = 1000 MW
Key Features of the Free Power Converter Tool
Our free power converter is packed with professional features:
1. 12+ Power Units
Watt (W), Kilowatt (kW), Megawatt (MW), Gigawatt (GW)
Horsepower (hp), Horsepower Metric (hp(M)), Horsepower Electrical (hp(E))
BTU per Hour (BTU/h)
Foot-Pound per Second (ft·lb/s)
Calorie per Second (cal/s), Kilocalorie per Hour (kcal/h)
Ton of Refrigeration (TR)
2. Visual Comparison
- Bar chart showing relative values
- Color-coded for easy understanding
3. Step-by-Step Solutions
- Shows every calculation step
- Explains mathematical reasoning
4. Quick Presets
- One-click for common conversions
- 6 quick preset buttons
5. Swap Units
- Click “Swap” to reverse units
6. Calculation History
- Stores last 50 conversions
- Click any entry to reload it
- Export as CSV
7. Export & Copy Options
- Copy Details: Copy all data to clipboard
- Export CSV: Export history as CSV
8. Dark Mode
Toggle between light and dark themes
Benefits of Using This Power Converter
Why Choose This Power Converter Over Others?
1. 12+ Power Units
Covers all common power units including W, kW, MW, GW, hp, BTU/h, TR, and more.
2. Visual Comparison
Bar chart shows relative values – great for understanding relationships.
3. Step-by-Step Solutions
See exactly how the result is calculated. Educational and transparent.
4. Quick Presets
One-click for common conversions – saves time.
5. Swap Units
Quickly reverse from and to units.
6. Calculation History
Never lose your conversions. History stores last 50 entries.
7. Copy & Export
Copy details or export history as CSV.
8. Privacy First
All processing happens in your browser. Your data never leaves your device.
9. Completely Free
No registration, no payment, no hidden costs.
Comparison with Other Power Converter Tools
| Features | Our Power Converter | Competitor A | Competitor B |
|---|---|---|---|
| Power Units | ✅ 12+ units | ❌ 6 units | ✅ 8 units |
| Visual Comparison | ✅ Yes (bar chart) | ❌ No | ❌ No |
| Step-by-Step Solutions | ✅ Yes | ❌ No | ❌ No |
| Quick Presets | ✅ 6 presets | ❌ No | ❌ No |
| Swap Units | ✅ Yes | ✅ Yes | ✅ Yes |
| Horsepower Types | ✅ 3 types (hp, hp(M), hp(E)) | ❌ 1 type | ❌ 1 type |
| Ton of Refrigeration | ✅ Yes | ❌ No | ❌ No |
| Gigawatt Support | ✅ Yes | ❌ No | ❌ No |
| Calculation History | ✅ Yes (50 entries) | ❌ No | ❌ No |
| CSV Export | ✅ Yes | ❌ No | ❌ No |
| Dark Mode | ✅ Yes | ❌ No | ❌ No |
| Privacy | ✅ 100% local | ❌ Server | ⚠️ Local |
| Cost | ✅ Free | ✅ Free | ❌ Limited |
Use Cases for the Power Converter Tool
1. For Electrical Engineers
Convert kW to hp for motor ratings
Calculate power consumption
Verify electrical system capacities
2. For Mechanical Engineers
- Convert hp to kW for engine specifications
- Calculate power transmission
- Verify mechanical system ratings
3. For HVAC Professionals
- Convert TR to kW for cooling capacity
- Work with BTU/h ratings
- Verify system specifications
4. For Students
- Convert power units for homework
- Learn conversion factors
- Check answers
5. For Electricians
- Convert power units for electrical work
- Calculate load requirements
- Verify circuit capacities
6. For Automotive Professionals
- Convert kW to hp for engine power
- Work with different power standards
- Verify vehicle specifications
Button Functions Explained
Value Input – Enter the power value to convert.
From Unit Dropdown – Select from 12+ power units.
To Unit Dropdown – Select target power unit.
Quick Preset Buttons – One-click for common conversions.
Convert Button – Perform the conversion.
Swap Button – Reverse the from and to units.
Result Display – Shows the converted value.
Notation Display – Shows the conversion expression.
Subtitle Display – Shows conversion factor.
Visual Comparison – Bar chart showing relative values.
Step-by-Step Box – Shows every calculation step.
Conversion Factor Card – Shows the conversion factor used.
Formula Card – Shows the formula used.
Reverse Result Card – Shows the reverse conversion.
Calculator Tab – Main conversion interface.
History Tab – Shows last 50 conversions.
Copy Details Button – Copy all conversion data.
Clear Button – Clear all inputs and reset results.
Clear History Button – Clear all history entries.
Export CSV Button – Export history as CSV file.
Frequently Asked Questions
Q1: Is the power converter really free?
Yes, completely free. No registration, no hidden charges, no usage limits.
Q2: How many power units are supported?
12+ units including W, kW, MW, GW, hp, hp(M), hp(E), BTU/h, ft·lb/s, cal/s, kcal/h, TR.
Q3: What is the difference between hp, hp(M), and hp(E)?
hp = Mechanical Horsepower (745.7 W), hp(M) = Metric Horsepower (735.5 W), hp(E) = Electrical Horsepower (746 W).
Q4: What is a Ton of Refrigeration (TR)?
1 TR = 3.51685 kW. It’s the cooling capacity needed to melt one ton of ice in 24 hours.
Q5: What is the difference between power and energy?
Power is the rate of energy transfer (W), while energy is the total amount (Joules or Watt-hours).
Q6: What is BTU/h?
British Thermal Unit per hour – commonly used for heating and cooling systems.
Q7: What is the visual comparison?
A bar chart showing the relative values of the from and to units.
Q8: Can I swap units?
Yes! Click the “Swap” button to reverse from and to units.
Q9: Does this work offline?
Yes. Once loaded in your browser, it works without internet access.
Q10: Is my data stored anywhere?
No. All data stays in your browser. Nothing is sent to any server.
Conclusion
Converting between different power units doesn’t have to be complicated. Our power converter gives you everything you need – from Watts and Kilowatts to Horsepower, BTU/h, and Ton of Refrigeration. Whether you’re an engineer, electrician, mechanic, or student, this tool has you covered.
Summary
- ✅ 12+ power units – W, kW, MW, GW, hp, hp(M), hp(E), BTU/h, ft·lb/s, cal/s, kcal/h, TR
- ✅ Visual comparison – bar chart showing relative values
- ✅ Step-by-step solutions – every calculation explained
- ✅ Quick presets – 6 common conversions
- ✅ Swap units – one-click reverse
- ✅ Calculation history – stores last 50 entries
- ✅ 100% private – nothing leaves your browser
- ✅ Completely free – no limits
Get Started Now
Ready to convert power units? Start using the tool right now – no sign-up, no hassle. Enter your value and get instant results. Try the free power converter now and make power conversions easy!
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UnitConverters.net Power Converter is a comprehensive online tool that offers power conversion across a wide range of units including Watt, Kilowatt, Megawatt, Horsepower, BTU/h, and Ton of Refrigeration. It’s trusted by professionals and students worldwide for its accuracy and clean interface.