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Kilowatt to Calorie per Second Converter

Convert kilowatts to cal/s with our free online power converter.

Quick Answer

1 Kilowatt = 239.005736 cal/s

Formula: Kilowatt Ɨ conversion factor = Calorie per Second

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

Kilowatt to Calorie per Second Calculator

How to Use the Kilowatt to Calorie per Second Calculator:

  1. Enter the value you want to convert in the 'From' field (Kilowatt).
  2. The converted value in Calorie 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 (ā‡Œ) to reverse the conversion direction.
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How to Convert Kilowatt to Calorie per Second: Step-by-Step Guide

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

Formula:

cal/s = kW Ɨ 239.006

Example Calculation:

1 kW = 239.005736 cal/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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What is a Kilowatt and a Calorie per Second?

1 kW = 1,000 W = 1.341 hp = 3,412 BTU/h = 1,000 J/s

1 cal/s = 4.184 W = 0.004184 kW = 0.0056 hp = 14.29 BTU/h

Note: This uses IT (International Table) calorie = 4.1868 J (standard)

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

Common Uses and Applications: kilowatts vs cal/s

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

Common Uses for kilowatts

Appliances: Heaters (1-2 kW), microwaves (0.8-1.2 kW), electric ovens (2-5 kW). EVs: Charging power (3.7-22 kW home, 50-350 kW fast charging). Solar: Residential systems (5-10 kW capacity). HVAC: Air conditioner power (2-7 kW for homes).

When to Use cal/s

Physics Education: Thermodynamics problems, heat transfer calculations. Older Literature: Pre-SI engineering texts, vintage HVAC data. Scientific: Some chemistry and biology applications. Rarely Modern: Watts or kilocalories per hour preferred today.

Additional Unit Information

About Kilowatt (kW)

How do I convert kW to horsepower?

Formula: hp = kW Ɨ 1.341

Examples:

  • 10 kW = 13.4 hp
  • 75 kW = 100.6 hp (100 hp)
  • 100 kW = 134.1 hp
  • 250 kW = 335.3 hp

kW to HP converter ā†’

What is the difference between kW and kWh?

kW (kilowatt) = Power (rate of energy use right now) kWh (kilowatt-hour) = Energy (total amount used over time)

Analogy:

  • kW = speedometer (speed right now)
  • kWh = odometer (total distance traveled)

Example: 2 kW heater Ɨ 3 hours = 6 kWh energy consumed

How much does 1 kW cost per hour?

Cost = kW Ɨ hours Ɨ electricity rate

Examples (at $0.15/kWh average US rate):

  • 1 kW for 1 hour = 1 kWh = $0.15
  • 2 kW heater for 8 hours = 16 kWh = $2.40
  • 100W light (0.1 kW) for 10 hours = 1 kWh = $0.15

Rates vary: $0.09-0.40/kWh depending on location and time of day.

How many kW is a typical home solar system?

Residential solar systems:

  • Small (2-4 people): 3-5 kW (10-15 panels)
  • Average home: 5-8 kW (15-24 panels)
  • Large home: 8-12 kW (24-36 panels)
  • Very large: 12-15+ kW (36-45+ panels)

Production: ~4-5 kWh per kW installed per day (varies by location, season).

Example: 6 kW system produces ~24-30 kWh/day, ~730-900 kWh/month.

About Calorie per Second (cal/s)

How do I convert cal/s to watts or kW?

Formula:

  • W = cal/s Ɨ 4.184
  • kW = cal/s Ɨ 0.004184

Examples:

  • 1 cal/s = 4.184 W
  • 10 cal/s = 41.84 W
  • 100 cal/s = 418.4 W = 0.418 kW
  • 1,000 cal/s = 4,184 W = 4.184 kW

cal/s to Watts converter ā†’ cal/s to kW converter ā†’

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

cal/s = Small calorie per second (rapid power) kcal/h = Kilocalorie (food Calorie) per hour (slower rate)

Conversion: 1 cal/s = 3.6 kcal/h

Usage:

  • cal/s: Physics, instant power measurements
  • kcal/h: Metabolism, HVAC (some regions)

Example: 70W human at rest

  • As watts: 70 W
  • As cal/s: 16.7 cal/s
  • As kcal/h: 60 kcal/h

How do I calculate heat transfer in cal/s?

Formula: Power (cal/s) = Heat (cal) Ć· Time (s)

Example: Melting ice

  • Ice mass: 100 g
  • Heat needed: 8,000 cal (80 cal/g latent heat)
  • Time: 60 seconds
  • Power: 8,000 Ć· 60 = 133 cal/s = 558 W

Heating water:

  • Water: 1 kg (1,000 g)
  • Temperature rise: 10Ā°C
  • Heat needed: 10,000 cal (1 cal/gā‹…Ā°C Ɨ 1,000g Ɨ 10Ā°C)
  • Time: 100 seconds
  • Power: 10,000 Ć· 100 = 100 cal/s = 418 W

Why use watts instead of cal/s?

SI standard: Watts are internationally standardized (1 W = 1 J/s) Simpler: Avoids cal vs kcal vs Cal confusion Electrical: All electrical power in watts Universal: Works across all energy forms (mechanical, electrical, thermal)

Exception: Some nutrition/metabolism research still uses cal/s or kcal/h for historical consistency.

Conversion Table: Kilowatt to Calorie per Second

Kilowatt (kW)Calorie per Second (cal/s)
0.5119.503
1239.006
1.5358.509
2478.012
51,195.029
102,390.057
255,975.143
5011,950.287
10023,900.574
25059,751.434
500119,502.868
1,000239,005.736

People Also Ask

How do I convert Kilowatt to Calorie per Second?

To convert Kilowatt to Calorie per Second, enter the value in Kilowatt 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 ā†’

What is the conversion factor from Kilowatt to Calorie per Second?

The conversion factor depends on the specific relationship between Kilowatt and Calorie 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 Calorie per Second back to Kilowatt?

Yes! You can easily convert Calorie per Second back to Kilowatt by using the swap button (ā‡Œ) in the calculator above, or by visiting our Calorie per Second to Kilowatt converter page. You can also explore other power conversions on our category page.

Learn more ā†’

What are common uses for Kilowatt and Calorie per Second?

Kilowatt and Calorie 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.

Helpful Conversion Guides

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šŸ“š How to Convert Units

Step-by-step guide to unit conversion with practical examples.

šŸ”¢ Conversion Formulas

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āš–ļø Metric vs Imperial

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āš ļø Common Mistakes

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Other Power Units and Conversions

Explore other power units and their conversion options:

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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 ā€” Fundamental physical constants and unit conversions

BIPM SI Units

Bureau International des Poids et Mesures ā€” International System of Units (SI) definitions and standards

ISO 80000

International Organization for Standardization ā€” Quantities and units international standards series

Last verified: February 19, 2026