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Metric Horsepower to Joule per Second Converter

Convert PS to J/s with our free online power converter.

Quick Answer

1 Metric Horsepower = 735.49875 J/s

Formula: Metric Horsepower × conversion factor = Joule per Second

Use the calculator below for instant, accurate conversions.

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All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.

Last verified: February 2026Reviewed by: Sam Mathew, Software Engineer

Metric Horsepower to Joule per Second Calculator

How to Use the Metric Horsepower to Joule per Second Calculator:

  1. Enter the value you want to convert in the 'From' field (Metric Horsepower).
  2. The converted value in Joule per Second will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Power category.
  4. Click the swap button (⇌) to reverse the conversion direction.
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How to Convert Metric Horsepower to Joule per Second: Step-by-Step Guide

Converting Metric Horsepower to Joule per Second involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

J/s = PS × 735.499

Example Calculation:

1 PS = 735.49875 J/s

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

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📋 Unit Symbols

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What is a Metric Horsepower and a Joule per Second?

1 PS = 735.5 W = 0.7355 kW = 0.9863 hp (mechanical) = 75 kgf⋅m/s = 2,510 BTU/h

Names by region:

  • PS (Pferdestärke) - German
  • CV (Chevaux Vapeur) - French
  • pk (paardenkracht) - Dutch
  • hk (hästkraft) - Swedish
  • LE (Leistungseinheit) - Older German

All equal exactly 735.5 watts.

1 J/s = 1 W (exactly, by definition)

SI Definition of Watt: 1 W = 1 J/s = 1 kg⋅m²/s³

Note: The Metric Horsepower is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Joule per Second belongs to the imperial/US customary system.

Common Uses and Applications: PS vs J/s

Explore the typical applications for both Metric Horsepower (imperial/US) and Joule per Second (imperial/US) to understand their common contexts.

Common Uses for PS

Automotive: Engine power ratings in Europe, Asia (100-500 PS typical). Motorcycles: Engine power specifications (15-200 PS). Industrial: European motors, pumps, machinery (kW now more common). Marine: European boat engines, outboards (5-500 PS).

When to Use J/s

Physics: Fundamental power unit, teaching energy/power relationship. Engineering: Power calculations, energy transfer rates. Scientific: Research papers, technical specifications. Interchangeable: J/s and W used synonymously.

Additional Unit Information

About Metric Horsepower (PS)

How do I convert PS to horsepower (hp)?

Formula: hp = PS × 0.9863 (or PS ÷ 1.014)

Examples:

  • 100 PS = 98.6 hp
  • 150 PS = 148 hp
  • 200 PS = 197 hp
  • 300 PS = 296 hp

Reverse: hp × 1.014 = PS

PS to HP converter →

How do I convert PS to kilowatts?

Formula: kW = PS × 0.7355 (or PS ÷ 1.36)

Examples:

  • 75 PS = 55.2 kW
  • 100 PS = 73.6 kW
  • 150 PS = 110.3 kW
  • 200 PS = 147.1 kW

Quick approximation: Divide PS by 1.36 to get kW

PS to kW converter →

What is the difference between PS and hp?

Metric HP (PS): 735.5 W (75 kgf⋅m/s, Europe/Asia) Mechanical HP (hp): 745.7 W (550 ft⋅lb/s, US/UK)

Difference: PS is 1.4% less than hp

Conversion: 1 PS = 0.9863 hp, 1 hp = 1.014 PS

Example:

  • BMW 330i: 258 PS = 254 hp = 190 kW
  • Ford Mustang: 450 hp = 456 PS = 336 kW

Modern trend: Manufacturers increasingly list all three (PS, hp, kW)

Why does Europe use PS instead of hp?

Historical: Metric system adoption in Continental Europe

Definition basis:

  • PS based on metric units (75 kg lifted 1 m in 1 s)
  • hp based on imperial units (550 lb lifted 1 ft in 1 s)

Current practice:

  • Official: kW is legal unit (EU regulations)
  • Marketing: PS still widely used in car advertising
  • Dual listing: Most specs show "kW (PS)" format

Example spec: "110 kW (150 PS)" on European car brochures

How do I compare engine specs in different units?

Three common formats:

  1. US/Canada: hp (horsepower mechanical)
  2. Europe/Asia: PS (metric horsepower)
  3. International: kW (kilowatts)

Quick comparison table:

| hp | PS | kW | |-----|-----|-----| | 100 | 101 | 75 | | 150 | 152 | 112 | | 200 | 203 | 149 | | 300 | 304 | 224 |

Conversion shortcuts:

  • hp ≈ PS (within 1-2%)
  • kW × 1.36 ≈ PS
  • hp × 0.746 ≈ kW

Example: Car rated at 184 PS = 181 hp = 135 kW (all same power)

About Joule per Second (J/s)

Why is 1 J/s = 1 W exactly?

SI Definition: The watt is defined as one joule per second

Dimensional analysis:

  • Energy: joules (J)
  • Time: seconds (s)
  • Power: energy/time = J/s

Therefore: 1 W ≡ 1 J/s (definitional equality)

Example: 100W device uses 100 J every second

  • 1 second: 100 J used
  • 10 seconds: 1,000 J used
  • 1 hour (3,600s): 360,000 J = 360 kJ = 0.1 kWh

How do I calculate power from energy and time?

Formula: Power (W or J/s) = Energy (J) ÷ Time (s)

Examples:

Charging phone:

  • Battery capacity: 15 Wh = 54,000 J
  • Charging time: 2 hours = 7,200 s
  • Charging power: 54,000 ÷ 7,200 = 7.5 J/s = 7.5 W

Lifting weight:

  • Work done: 500 J (lifting 50 kg by 1 meter)
  • Time taken: 2 seconds
  • Power output: 500 ÷ 2 = 250 J/s = 250 W

Boiling water:

  • Energy needed: 420,000 J (1 liter, 25°C to 100°C)
  • Time: 6 minutes = 360 s
  • Power: 420,000 ÷ 360 = 1,167 J/s = 1,167 W = 1.17 kW

What is the difference between J/s and J?

J (Joule) = Energy (total amount) J/s (Joule per second) = Power (rate of energy transfer)

Analogy:

  • J = distance traveled (miles)
  • J/s = speed (miles per hour)

Example:

  • Energy stored: 10,000 J (battery capacity)
  • Power delivered: 100 J/s (discharge rate)
  • Time to empty: 10,000 ÷ 100 = 100 seconds

Another example:

  • Microwave energy delivered: 600,000 J (to heat food)
  • Microwave power: 1,000 J/s
  • Cooking time: 600,000 ÷ 1,000 = 600 s = 10 minutes

How do I convert between J/s and other power units?

J/s to watts: 1:1 (they're the same)

J/s to other units:

  • kW = J/s ÷ 1,000
  • hp = J/s ÷ 745.7
  • BTU/h = J/s × 3.412

Examples:

  • 1,000 J/s = 1,000 W = 1 kW
  • 745.7 J/s = 745.7 W = 1 hp
  • 100 J/s = 100 W = 341.2 BTU/h

J/s to kW converter → J/s to HP converter →

Why use W instead of J/s if they're identical?

Brevity: "100 watts" vs "100 joules per second" Convention: Industry standard since 1960 Honor: Named after James Watt (inventor, engineer) Clarity: Distinguishes power from energy (avoids "joules per hour" confusion)

In practice: Both acceptable, but "watt" strongly preferred in all applications. Scientific papers use both interchangeably.

Conversion Table: Metric Horsepower to Joule per Second

Metric Horsepower (PS)Joule per Second (J/s)
0.5367.749
1735.499
1.51,103.248
21,470.998
53,677.494
107,354.988
2518,387.469
5036,774.938
10073,549.875
250183,874.688
500367,749.375
1,000735,498.75

People Also Ask

How do I convert Metric Horsepower to Joule per Second?

To convert Metric Horsepower to Joule per Second, enter the value in Metric Horsepower in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our power converter page to convert between other units in this category.

Learn more →

What is the conversion factor from Metric Horsepower to Joule per Second?

The conversion factor depends on the specific relationship between Metric Horsepower and Joule per Second. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.

Can I convert Joule per Second back to Metric Horsepower?

Yes! You can easily convert Joule per Second back to Metric Horsepower by using the swap button (⇌) in the calculator above, or by visiting our Joule per Second to Metric Horsepower converter page. You can also explore other power conversions on our category page.

Learn more →

What are common uses for Metric Horsepower and Joule per Second?

Metric Horsepower and Joule per Second are both standard units used in power measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our power converter for more conversion options.

For more power conversion questions, visit our FAQ page or explore our conversion guides.

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Verified Against Authority Standards

All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.

NIST Reference on Constants, Units and Uncertainty

National Institute of Standards and Technology — Fundamental physical constants and unit conversions

BIPM SI Units

Bureau International des Poids et Mesures — International System of Units (SI) definitions and standards

ISO 80000

International Organization for Standardization — Quantities and units international standards series

Last verified: February 19, 2026