Updated · Methodology: named formula library
1 hp = 745.7 W. To convert hp to W, multiply by 745.7. To convert W back to hp, multiply by 0.001341.
Horsepower to Watts
Convert HP to watts.
1 hp converts to 745.7 W.
Why This Calculation Matters
The Horsepower to Watts gives you exact, standards-based conversions for horsepower to watts. Conversion factors match NIST / BIPM definitions so results are suitable for engineering, science, or everyday use.
How to Use This Calculator
- Enter your values in the input fields, each one has a label and help text explaining what to type.
- Results appear instantly as you type; there's no "calculate" button to press.
- Change any input to compare scenarios side by side.
All math happens in your browser. Nothing you type is sent to a server, saved, or shared.
How to Use
Enter values in the fields on the left. Results update as you type, no submit button needed.
Understanding Results
Each output shows the calculated figure plus a breakdown of contributing inputs. Compare scenarios by editing any value.
Accuracy Notes
Every Horsepower to Watts on CalcIntel uses a documented formula. Results are estimates, real outcomes depend on assumptions and market conditions not captured in a simplified calculation.
Worked Example
Convert 1 hp to W
- value
- 1
- Result
- 745.7 W
1 × 745.7 = 745.7 W.
hp to W Chart
| hp | W |
|---|---|
| 1 hp | 745.7 W |
| 2 hp | 1,491.4 W |
| 3 hp | 2,237.1 W |
| 5 hp | 3,728.5 W |
| 10 hp | 7,457 W |
| 20 hp | 14,914 W |
| 25 hp | 18,643 W |
| 50 hp | 37,285 W |
| 75 hp | 55,928 W |
| 100 hp | 74,570 W |
| 200 hp | 149,140 W |
| 500 hp | 372,850 W |
| 1,000 hp | 745,700 W |
| 5,000 hp | 3,728,500 W |
Multiplier: × 745.7
W to hp Chart
| W | hp |
|---|---|
| 1 W | 0.001341 hp |
| 2 W | 0.002682 hp |
| 3 W | 0.004023 hp |
| 5 W | 0.006705 hp |
| 10 W | 0.01341 hp |
| 20 W | 0.02682 hp |
| 25 W | 0.033526 hp |
| 50 W | 0.067051 hp |
| 75 W | 0.100577 hp |
| 100 W | 0.134102 hp |
| 200 W | 0.268204 hp |
| 500 W | 0.670511 hp |
| 1,000 W | 1.341 hp |
| 5,000 W | 6.705 hp |
Multiplier: × 0.001341
Common Specific Values
10 hp to W
10 hp equals 7,457 W. (10 × 745.7 = 7,457)
25 hp to W
25 hp equals 18,643 W. (25 × 745.7 = 18,643)
50 hp to W
50 hp equals 37,285 W. (50 × 745.7 = 37,285)
100 hp to W
100 hp equals 74,570 W. (100 × 745.7 = 74,570)
500 hp to W
500 hp equals 372,850 W. (500 × 745.7 = 372,850)
When to Use This Calculator
- Convert between metric and imperial without searching for factors.
- Verify a unit-aware calculation in engineering, science, or cooking.
- Translate specifications across U.S. and international standards.
Limitations & Common Mistakes
- Results are estimates, real-world outcomes depend on factors not captured in a simplified calculation.
- Always verify critical numbers against an authoritative source or domain expert before acting on them.
Frequently Asked Questions
How do you convert hp to W?
Multiply by 745.7. So 1 hp = 745.7 W, and 10 hp = 7,457 W. This conversion factor is exact (or rounded to 1 decimals for practical use).
Where does the 745.7 come from?
It's the standard SI/US-customary conversion factor for hp → W, defined by NIST and BIPM. The CalcIntel Horsepower to Watts uses the same factor your physics textbook, government conversion table, and Wolfram Alpha would use.
How accurate is this conversion?
Mathematically exact. The only loss of precision comes from rounding the displayed result to 1 decimals. For scientific applications requiring more precision, multiply by the factor manually.
Can I convert in the other direction?
Yes — divide by 745.7 to convert from W back to hp, or use the CalcIntel W-to-hp calculator if available.
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Source: BLS Consumer Price Index, 2026.