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Horsepower to Watt

Professional hp to W conversion.

Horsepower
Imperial unit of power, approximately equal to 745.7 watts.
Watt
The SI unit of power, equivalent to one joule per second.
Quick LinksLogic & FormulaFAQ
745.7
Unit
  • Attojoule/second
    aJ/s
  • Attowatt
    aW
  • Femtojoule/second
    fJ/s
  • Femtowatt
    fW
  • Picojoule/second
    pJ/s
  • Picowatt
    pW
  • Nanojoule/second
    nJ/s
  • Nanowatt
    nW
  • Erg/second
    erg/s
  • Microjoule/second
    µJ/s
  • Microwatt
    µW
  • Joule/hour
    J/h
  • Foot·pound-force/hour
    ft·lbf/h
  • Pound·foot/hour
    lbf·ft/h
  • Millijoule/second
    mJ/s
  • Milliwatt
    mW
  • Calorie (th)/hour
    cal (th)/h
  • Calorie (IT)/hour
    cal/h
  • Centijoule/second
    cJ/s
  • Centiwatt
    cW
  • Joule/minute
    J/min
  • Foot·pound-force/minute
    ft·lbf/min
  • Pound·foot/minute
    lbf·ft/min
  • Calorie (th)/minute
    cal (th)/min
  • Calorie (IT)/minute
    cal/min
  • Decijoule/second
    dJ/s
  • Deciwatt
    dW
  • Kilojoule/hour
    kJ/h
  • BTU (th)/hour
    Btu (th)/h
  • BTU/hr
    BTU/h
  • Joule/second
    J/s
  • Newton-meter/second
    N·m/s
  • Volt-ampere
    VA
  • Watt
    W
  • Kilocalorie per hour
    kcal/h
  • Kilocalorie (IT)/hour
    kcal/h
  • Foot·pound-force/second
    ft·lbf/s
  • Pound·foot/second
    lbf·ft/s
  • Calorie (th)/second
    cal (th)/s
  • Calorie (IT)/second
    cal/s
  • Dekajoule/second
    daJ/s
  • Dekawatt
    daW
  • Kilojoule/minute
    kJ/min
  • BTU (th)/minute
    Btu (th)/min
  • BTU (IT)/minute
    Btu/min
  • Kilocalorie (th)/minute
    kcal (th)/min
  • Kilocalorie (IT)/minute
    kcal/min
  • Hectojoule/second
    hJ/s
  • Hectowatt
    hW
  • MBH
    MBH
  • Horsepower (Metric)
    PS
  • Pferdestärke
    PS
  • Horsepower (550 ft·lbf/s)
    hp
  • Horsepower
    hp
  • Horsepower (Electric)
    hp (electric)
  • Horsepower (Water)
    hp (water)
  • Kilojoule/second
    kJ/s
  • Kilovolt-ampere
    kVA
  • Kilowatt
    kW
  • BTU (th)/second
    Btu (th)/s
  • BTU (IT)/second
    Btu/s
  • Ton of refrigeration
    TR
  • Kilocalorie (th)/second
    kcal (th)/s
  • Kilocalorie (IT)/second
    kcal/s
  • Horsepower (Boiler)
    hp (boiler)
  • MBtu (IT)/hour
    MBtu/h
  • Megajoule/second
    MJ/s
  • Megawatt
    MW
  • Gigajoule/second
    GJ/s
  • Gigawatt
    GW
  • Terajoule/second
    TJ/s
  • Terawatt
    TW
  • Petajoule/second
    PJ/s
  • Petawatt
    PW
  • Exajoule/second
    EJ/s
  • Exawatt
    EW
Unit
  • Attojoule/second
    aJ/s
  • Attowatt
    aW
  • Femtojoule/second
    fJ/s
  • Femtowatt
    fW
  • Picojoule/second
    pJ/s
  • Picowatt
    pW
  • Nanojoule/second
    nJ/s
  • Nanowatt
    nW
  • Erg/second
    erg/s
  • Microjoule/second
    µJ/s
  • Microwatt
    µW
  • Joule/hour
    J/h
  • Foot·pound-force/hour
    ft·lbf/h
  • Pound·foot/hour
    lbf·ft/h
  • Millijoule/second
    mJ/s
  • Milliwatt
    mW
  • Calorie (th)/hour
    cal (th)/h
  • Calorie (IT)/hour
    cal/h
  • Centijoule/second
    cJ/s
  • Centiwatt
    cW
  • Joule/minute
    J/min
  • Foot·pound-force/minute
    ft·lbf/min
  • Pound·foot/minute
    lbf·ft/min
  • Calorie (th)/minute
    cal (th)/min
  • Calorie (IT)/minute
    cal/min
  • Decijoule/second
    dJ/s
  • Deciwatt
    dW
  • Kilojoule/hour
    kJ/h
  • BTU (th)/hour
    Btu (th)/h
  • BTU/hr
    BTU/h
  • Joule/second
    J/s
  • Newton-meter/second
    N·m/s
  • Volt-ampere
    VA
  • Watt
    W
  • Kilocalorie per hour
    kcal/h
  • Kilocalorie (IT)/hour
    kcal/h
  • Foot·pound-force/second
    ft·lbf/s
  • Pound·foot/second
    lbf·ft/s
  • Calorie (th)/second
    cal (th)/s
  • Calorie (IT)/second
    cal/s
  • Dekajoule/second
    daJ/s
  • Dekawatt
    daW
  • Kilojoule/minute
    kJ/min
  • BTU (th)/minute
    Btu (th)/min
  • BTU (IT)/minute
    Btu/min
  • Kilocalorie (th)/minute
    kcal (th)/min
  • Kilocalorie (IT)/minute
    kcal/min
  • Hectojoule/second
    hJ/s
  • Hectowatt
    hW
  • MBH
    MBH
  • Horsepower (Metric)
    PS
  • Pferdestärke
    PS
  • Horsepower (550 ft·lbf/s)
    hp
  • Horsepower
    hp
  • Horsepower (Electric)
    hp (electric)
  • Horsepower (Water)
    hp (water)
  • Kilojoule/second
    kJ/s
  • Kilovolt-ampere
    kVA
  • Kilowatt
    kW
  • BTU (th)/second
    Btu (th)/s
  • BTU (IT)/second
    Btu/s
  • Ton of refrigeration
    TR
  • Kilocalorie (th)/second
    kcal (th)/s
  • Kilocalorie (IT)/second
    kcal/s
  • Horsepower (Boiler)
    hp (boiler)
  • MBtu (IT)/hour
    MBtu/h
  • Megajoule/second
    MJ/s
  • Megawatt
    MW
  • Gigajoule/second
    GJ/s
  • Gigawatt
    GW
  • Terajoule/second
    TJ/s
  • Terawatt
    TW
  • Petajoule/second
    PJ/s
  • Petawatt
    PW
  • Exajoule/second
    EJ/s
  • Exawatt
    EW
Precision: 8 decimal places

Logic & Formula

To convert Horsepower to Watt, we use the specific conversion ratio for this category. 1 hp is equal to 745.7 W.

Value in W = (Value in hp * 745.7) / 1

Unit Definitions

Horsepower

Imperial unit of power, approximately equal to 745.7 watts.

Watt

The SI unit of power, equivalent to one joule per second.

Verified 2026 Standards
Industrial Precision

How to convert Horsepower to Watt?

Enter the value in Horsepower, choose the target unit Watt, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.

Formula: Value in W = Value in hp × 745.7

Common Conversions Table

Value (hp)Result (W)
1745.7
107457
2518642.5
5037285
10074570
1000745700

FAQ

What is the conversion formula from hp to W?
Value in W = Value in hp × 745.7
What is the smallest unit in Power?
The smallest unit (as defined on this site) is: Attowatt (aW). For higher precision, convert using a smaller unit first.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

About this conversion

This page converts Horsepower to Watt using verified ratios and includes tables, examples, and FAQs for quick verification.

Horsepower
Imperial unit of power, approximately equal to 745.7 watts.
Watt
The SI unit of power, equivalent to one joule per second.

Formula and precision

Value in W = Value in hp × 745.7
1 hp is equal to 745.7 W.
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.
  • Use smaller units for higher precision, then convert back if needed.
  • Temperature and fuel categories can’t be reduced to one constant multiplier.
  • Symbols vary by region (US/UK gallons, metric vs. imperial abbreviations).
  • For engineering work, validate with a second reference and keep unit symbols.

Quick examples

Example: 1 hp = 745.7 W.

Value (hp)Result (W)
1745.7
12.59321.25
5037285
10074570

Common mistakes and definitions

  • Rounding too early (convert first, then round at the end).
  • Mixing similar-looking symbols (for example, “m” vs “mm”, or “b” vs “B”).
  • Copying values without the unit symbol, which makes validation harder.

Common Conversions Table

Horsepower (hp)Watt (W)
1745.7
21491.4
32237.1
53728.5
107457
2518642.5
5037285
10074570
250186425
500372850
1000745700

Category facts

Smallest unit (on this site)
Attowatt (aW)
Largest unit (on this site)
Exawatt (EW)

Popular conversions

Back to Power category Browse more related converters below.

Horsepower → WattWatt → KilowattKilowatt → HorsepowerMegawatt → WattWatt → AttowattWatt → Centijoule/secondWatt → Calorie (th)/secondWatt → Kilovolt-ampere

Related conversions

Convert Horsepower to:
Horsepower (550 ft·lbf/s)Horsepower (Electric)Horsepower (Water)Horsepower (Metric)PferdestärkeKilowattKilovolt-ampereKilojoule/second
Convert to Watt from:
Volt-ampereNewton-meter/secondJoule/secondKilocalorie per hourKilocalorie (IT)/hourFoot·pound-force/secondPound·foot/secondBTU/hr

FAQ

How to convert Horsepower to Watt?
Enter the value in Horsepower, choose the target unit Watt, and the result updates instantly. This page also includes the conversion formula and a quick reference table for verification.
What is the conversion formula from hp to W?
Value in W = Value in hp × 745.7
What is the smallest unit in Power?
The smallest unit (as defined on this site) is: Attowatt (aW). For higher precision, convert using a smaller unit first.
Why can results differ between websites?
Different standards, rounding rules, and unit definitions can change results. This page shows the formula used for transparency.
Are the results accurate?
Yes. Conversions run locally in your browser using verified ratios and display up to 8 decimals. Some categories like temperature and fuel use specialized formulas.

More Related Power Tools

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Did you know?

Convert mechanical and electrical power units. Precision is the cornerstone of our platform. We utilize 15-digit floating-point arithmetic to ensure results meet 2026 industrial and academic verification standards. Looking for other types of calculations? Explore our Main Dashboard for 100,000+ precision permutations.