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Electric Horsepower to Kilocalorie per Hour Converter

Convert hp(E) to kcal/h with our free online power converter.

Quick Answer

1 Electric Horsepower = 641.873805 kcal/h

Formula: Electric Horsepower × conversion factor = Kilocalorie per Hour

Use the calculator below for instant, accurate conversions.

Our Accuracy Guarantee

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

Electric Horsepower to Kilocalorie per Hour Calculator

How to Use the Electric Horsepower to Kilocalorie per Hour Calculator:

  1. Enter the value you want to convert in the 'From' field (Electric Horsepower).
  2. The converted value in Kilocalorie per Hour 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 Electric Horsepower to Kilocalorie per Hour: Step-by-Step Guide

Converting Electric Horsepower to Kilocalorie per Hour involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

kcal/h = hp(E) × 641.874

Example Calculation:

1 hp(E) = 641.873805 kcal/h

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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What is a Electric Horsepower and a Kilocalorie per Hour?

1 hp(E) = 746 W = 0.746 kW = 1.0004 hp (mechanical) = 2,545 BTU/h

Difference from mechanical hp: 746 W vs 745.7 W (0.04% higher)

1 kcal/h = 1.163 W = 0.001163 kW = 0.00156 hp = 3.968 BTU/h = 4,184 J/h

Note: Uses food Calorie (Cal) = kilocalorie (kcal) = 1,000 small calories

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

Common Uses and Applications: hp(E) vs kcal/h

Explore the typical applications for both Electric Horsepower (imperial/US) and Kilocalorie per Hour (imperial/US) to understand their common contexts.

Common Uses for hp(E)

Electric Motors: Industrial motors, pumps, compressors (ratings in hp(E)). HVAC: Fan motors, blower motors (fractional to 10 hp). Manufacturing: Conveyor motors, machine tools (1-100 hp). Residential: Garage door openers, pool pumps (0.5-3 hp).

When to Use kcal/h

Metabolism: Basal metabolic rate (BMR), daily energy expenditure. Nutrition: Energy requirements, dietary planning. HVAC: Human body heat load in building calculations (Europe). Sports Science: Exercise energy expenditure, training zones.

Additional Unit Information

About Electric Horsepower (hp(E))

How do I convert electric horsepower to watts?

Formula: W = hp(E) × 746

Examples:

  • 1 hp(E) = 746 W
  • 5 hp(E) = 3,730 W = 3.73 kW
  • 10 hp(E) = 7,460 W = 7.46 kW
  • 0.5 hp(E) = 373 W

Electric HP to Watts converter →

What is the difference between electric and mechanical horsepower?

Electric HP (hp(E)): 746 W exactly (US electric motors) Mechanical HP (hp): 745.7 W (550 ft⋅lb/s, automotive standard)

Difference: 0.04% (practically identical)

Usage:

  • Electric motors → hp(E)
  • Engines (gas, diesel) → mechanical hp
  • International → kW preferred

Conversion: 1 hp(E) = 1.0004 hp (mechanical)

How much power does a 1 hp electric motor use?

Full load: 746 W input (if 100% efficient)

Realistic power draw (accounting for efficiency):

  • 50% efficiency: 1,492 W (1.5 kW)
  • 70% efficiency: 1,066 W (1.07 kW)
  • 85% efficiency: 878 W (0.88 kW)
  • 90% efficiency: 829 W (0.83 kW)

Example: 1 hp motor at 85% efficiency draws 878W. Running 8 hours = 7 kWh energy consumed.

Modern motors: 85-95% efficient. Older motors: 70-85%.

Why use hp(E) instead of kW?

US tradition: Motor industry established before SI metric adoption

Current practice:

  • US: Both hp(E) and kW used (hp(E) more common for small motors)
  • Europe/Asia: Primarily kW
  • International standards: Moving toward kW only

Nameplate labeling: Many US motors show both (e.g., "1 hp / 0.75 kW")

Conversion: Divide hp(E) by 1.341 to get kW

How do I size a motor for my application?

Basic formula: Required hp = (Torque × RPM) ÷ 5,252

Practical approach:

  1. Determine load requirements (torque, speed, duty cycle)
  2. Add safety factor: Multiply by 1.15-1.25 (15-25% margin)
  3. Select next standard size: 1/4, 1/3, 1/2, 3/4, 1, 1.5, 2, 3, 5, 7.5, 10 hp

Example: Application needs 0.8 hp → Add 25% = 1 hp → Select 1 hp motor

Avoid oversizing: Wastes energy, motors run inefficiently at low load.

About Kilocalorie per Hour (kcal/h)

How do I convert kcal/h to watts?

Formula: W = kcal/h × 1.163

Examples:

  • 60 kcal/h = 70 W (sleeping)
  • 100 kcal/h = 116 W (sitting)
  • 500 kcal/h = 582 W (running)
  • 1,000 kcal/h = 1,163 W = 1.16 kW

kcal/h to Watts converter →

How do I calculate my basal metabolic rate (BMR)?

Mifflin-St Jeor Equation (most accurate):

Men: BMR (kcal/day) = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) + 5 Women: BMR (kcal/day) = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) - 161

Convert to kcal/h: Divide by 24

Example - 30-year-old male, 80kg, 180cm:

  • BMR = (10 × 80) + (6.25 × 180) - (5 × 30) + 5 = 1,730 kcal/day
  • Hourly rate: 1,730 ÷ 24 = 72 kcal/h = 84 W

Example - 30-year-old female, 65kg, 165cm:

  • BMR = (10 × 65) + (6.25 × 165) - (5 × 30) - 161 = 1,370 kcal/day
  • Hourly rate: 1,370 ÷ 24 = 57 kcal/h = 66 W

What is the difference between kcal/h and cal/s?

kcal/h = Kilocalories per hour (large Calorie per hour) cal/s = Calories per second (small calorie per second)

Conversion: 1 cal/s = 3.6 kcal/h

Usage:

  • kcal/h: Metabolism, nutrition (aligns with daily calorie counts)
  • cal/s: Physics, thermodynamics

Example: 100W power

  • As watts: 100 W
  • As kcal/h: 86 kcal/h
  • As cal/s: 24 cal/s

How many kcal/h do I burn exercising?

MET (Metabolic Equivalent) method:

Formula: kcal/h = MET × weight(kg) × 1.05

Common MET values:

  • Sleeping: 0.9 METs
  • Sitting: 1.0 METs
  • Walking (3 mph): 3.5 METs
  • Jogging (5 mph): 8.0 METs
  • Running (7 mph): 11.5 METs
  • Cycling (moderate): 8.0 METs
  • Swimming (moderate): 8.0 METs

Example - 70kg person running at 7 mph:

  • kcal/h = 11.5 × 70 × 1.05 = 845 kcal/h = 982 W

Example - 70kg person walking at 3 mph:

  • kcal/h = 3.5 × 70 × 1.05 = 257 kcal/h = 299 W

Why does HVAC use kcal/h in some countries?

Historical: European HVAC tradition used kcal/h before SI adoption Body heat: Natural unit for human heat output (matches food calories) Transition: Many European countries now use watts Mixed practice: Some European standards still reference kcal/h

Conversion for HVAC:

  • 1 person (seated): 100 kcal/h = 116 W
  • Conference room (20 people): 2,000 kcal/h = 2,320 W = 2.32 kW
  • Gym (50 people, active): 20,000 kcal/h = 23,200 W = 23.2 kW

Modern practice: Most HVAC calculations now in watts or BTU/h.

Conversion Table: Electric Horsepower to Kilocalorie per Hour

Electric Horsepower (hp(E))Kilocalorie per Hour (kcal/h)
0.5320.937
1641.874
1.5962.811
21,283.748
53,209.369
106,418.738
2516,046.845
5032,093.69
10064,187.381
250160,468.451
500320,936.903
1,000641,873.805

People Also Ask

How do I convert Electric Horsepower to Kilocalorie per Hour?

To convert Electric Horsepower to Kilocalorie per Hour, enter the value in Electric 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 Electric Horsepower to Kilocalorie per Hour?

The conversion factor depends on the specific relationship between Electric Horsepower and Kilocalorie per Hour. 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 Kilocalorie per Hour back to Electric Horsepower?

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

Learn more →

What are common uses for Electric Horsepower and Kilocalorie per Hour?

Electric Horsepower and Kilocalorie per Hour 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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Other Power Units and Conversions

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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