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CalcIntel

Updated · Methodology: named formula library

1 W = 0.001341 hp. To convert W to hp, multiply by 0.001341. To convert hp back to W, multiply by 745.7.

Watts to Horsepower

Convert watts to HP.

1 W =
0.0013 hp

1 W converts to 0.0013 hp.

Input (W)1
Output (hp)0.0013
Conversion factor× 0.00134102
Data sources: CalcIntel Formula Library

Why This Calculation Matters

The Watts to Horsepower gives you exact, standards-based conversions for watts to horsepower. 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 Watts to Horsepower 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 W to hp

value
1
Result
0.0013 hp

1 × 0.00134102 = 0.0013 hp.

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 W0.033525 hp
50 W0.067051 hp
75 W0.100576 hp
100 W0.134102 hp
200 W0.268204 hp
500 W0.67051 hp
1,000 W1.341 hp
5,000 W6.705 hp

Multiplier: × 0.001341

hp to W Chart

hpW
1 hp745.7 W
2 hp1,491.4 W
3 hp2,237.1 W
5 hp3,728.51 W
10 hp7,457.01 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 hp372,851 W
1,000 hp745,701 W
5,000 hp3,728,505 W

Multiplier: × 745.7

Common Specific Values

10 W to hp

10 W equals 0.01341 hp. (10 × 0.001341 = 0.01341)

25 W to hp

25 W equals 0.033525 hp. (25 × 0.001341 = 0.033525)

50 W to hp

50 W equals 0.067051 hp. (50 × 0.001341 = 0.067051)

100 W to hp

100 W equals 0.134102 hp. (100 × 0.001341 = 0.134102)

500 W to hp

500 W equals 0.67051 hp. (500 × 0.001341 = 0.67051)

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 W to hp?

Multiply by 0.00134102. So 1 W = 0.00134102 hp, and 10 W = 0.0134 hp. This conversion factor is exact (or rounded to 4 decimals for practical use).

Where does the 0.00134102 come from?

It's the standard SI/US-customary conversion factor for W → hp, defined by NIST and BIPM. The CalcIntel Watts to Horsepower 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 4 decimals. For scientific applications requiring more precision, multiply by the factor manually.

Can I convert in the other direction?

Yes — divide by 0.00134102 to convert from hp back to W, or use the CalcIntel hp-to-W calculator if available.

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Source: BLS Consumer Price Index, 2026.