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CalcIntel

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 =
745.7 W

1 hp converts to 745.7 W.

Input (hp)1
Output (W)745.7
Conversion factor× 745.7
Data sources: CalcIntel Formula Library

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

hpW
1 hp745.7 W
2 hp1,491.4 W
3 hp2,237.1 W
5 hp3,728.5 W
10 hp7,457 W
20 hp14,914 W
25 hp18,643 W
50 hp37,285 W
75 hp55,928 W
100 hp74,570 W
200 hp149,140 W
500 hp372,850 W
1,000 hp745,700 W
5,000 hp3,728,500 W

Multiplier: × 745.7

W to hp Chart

Whp
1 W0.001341 hp
2 W0.002682 hp
3 W0.004023 hp
5 W0.006705 hp
10 W0.01341 hp
20 W0.02682 hp
25 W0.033526 hp
50 W0.067051 hp
75 W0.100577 hp
100 W0.134102 hp
200 W0.268204 hp
500 W0.670511 hp
1,000 W1.341 hp
5,000 W6.705 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.