UnitsConverter

Calorie per Second to Joule per Second Converter

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

Quick Answer

1 Calorie per Second = 4.184 J/s

Formula: Calorie per Second × conversion factor = Joule 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

Calorie per Second to Joule per Second Calculator

How to Use the Calorie per Second to Joule per Second Calculator:

  1. Enter the value you want to convert in the 'From' field (Calorie per Second).
  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.
Share:

How to Convert Calorie per Second to Joule per Second: Step-by-Step Guide

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

Formula:

J/s = cal/s × 4.184

Example Calculation:

1 cal/s = 4.184 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.

Need to convert to other power units?

View all Power conversions →
📊 Power Table

Print-friendly conversion reference

📋 Unit Symbols

Copy cal/s & J/s symbols

What is a Calorie per Second and a Joule per Second?

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)

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

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

Note: The Calorie per Second 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: cal/s vs J/s

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

Common Uses for 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.

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 Calorie per Second (cal/s)

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

Formula:

  • W = cal/s × 4.184
  • kW = cal/s × 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 → cal/s to kW converter →

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) ÷ 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 ÷ 60 = 133 cal/s = 558 W

Heating water:

  • Water: 1 kg (1,000 g)
  • Temperature rise: 10°C
  • Heat needed: 10,000 cal (1 cal/g⋅°C × 1,000g × 10°C)
  • Time: 100 seconds
  • Power: 10,000 ÷ 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.

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: Calorie per Second to Joule per Second

Calorie per Second (cal/s)Joule per Second (J/s)
0.52.092
14.184
1.56.276
28.368
520.92
1041.84
25104.6
50209.2
100418.4
2501,046
5002,092
1,0004,184

People Also Ask

How do I convert Calorie per Second to Joule per Second?

To convert Calorie per Second to Joule per Second, enter the value in Calorie per Second 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 Calorie per Second to Joule per Second?

The conversion factor depends on the specific relationship between Calorie per Second 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 Calorie per Second?

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

Learn more →

What are common uses for Calorie per Second and Joule per Second?

Calorie per Second 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.

Helpful Conversion Guides

Learn more about unit conversion with our comprehensive guides:

📚 How to Convert Units

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

🔢 Conversion Formulas

Essential formulas for power and other conversions.

⚖️ Metric vs Imperial

Understand the differences between measurement systems.

⚠️ Common Mistakes

Learn about frequent errors and how to avoid them.

View All Guides →

All Power Conversions

Watt to MilliwattWatt to KilowattWatt to MegawattWatt to GigawattWatt to HorsepowerWatt to Metric HorsepowerWatt to Electric HorsepowerWatt to BTU per HourWatt to BTU per MinuteWatt to BTU per SecondWatt to Foot-pound per SecondWatt to Foot-pound per MinuteWatt to Calorie per SecondWatt to Kilocalorie per HourWatt to Ton of RefrigerationWatt to Erg per SecondWatt to Joule per SecondMilliwatt to WattMilliwatt to KilowattMilliwatt to MegawattMilliwatt to GigawattMilliwatt to HorsepowerMilliwatt to Metric HorsepowerMilliwatt to Electric HorsepowerMilliwatt to BTU per HourMilliwatt to BTU per MinuteMilliwatt to BTU per SecondMilliwatt to Foot-pound per SecondMilliwatt to Foot-pound per MinuteMilliwatt to Calorie per SecondMilliwatt to Kilocalorie per HourMilliwatt to Ton of RefrigerationMilliwatt to Erg per SecondMilliwatt to Joule per SecondKilowatt to WattKilowatt to MilliwattKilowatt to MegawattKilowatt to GigawattKilowatt to HorsepowerKilowatt to Metric HorsepowerKilowatt to Electric HorsepowerKilowatt to BTU per HourKilowatt to BTU per MinuteKilowatt to BTU per SecondKilowatt to Foot-pound per SecondKilowatt to Foot-pound per MinuteKilowatt to Calorie per SecondKilowatt to Kilocalorie per HourKilowatt to Ton of RefrigerationKilowatt to Erg per SecondKilowatt to Joule per SecondMegawatt to WattMegawatt to MilliwattMegawatt to KilowattMegawatt to GigawattMegawatt to HorsepowerMegawatt to Metric HorsepowerMegawatt to Electric HorsepowerMegawatt to BTU per HourMegawatt to BTU per MinuteMegawatt to BTU per SecondMegawatt to Foot-pound per SecondMegawatt to Foot-pound per MinuteMegawatt to Calorie per SecondMegawatt to Kilocalorie per HourMegawatt to Ton of RefrigerationMegawatt to Erg per SecondMegawatt to Joule per SecondGigawatt to WattGigawatt to MilliwattGigawatt to KilowattGigawatt to MegawattGigawatt to HorsepowerGigawatt to Metric HorsepowerGigawatt to Electric HorsepowerGigawatt to BTU per HourGigawatt to BTU per MinuteGigawatt to BTU per SecondGigawatt to Foot-pound per SecondGigawatt to Foot-pound per MinuteGigawatt to Calorie per SecondGigawatt to Kilocalorie per HourGigawatt to Ton of RefrigerationGigawatt to Erg per SecondGigawatt to Joule per SecondHorsepower to WattHorsepower to MilliwattHorsepower to KilowattHorsepower to MegawattHorsepower to GigawattHorsepower to Metric HorsepowerHorsepower to Electric HorsepowerHorsepower to BTU per HourHorsepower to BTU per MinuteHorsepower to BTU per SecondHorsepower to Foot-pound per SecondHorsepower to Foot-pound per MinuteHorsepower to Calorie per SecondHorsepower to Kilocalorie per HourHorsepower to Ton of RefrigerationHorsepower to Erg per SecondHorsepower to Joule per SecondMetric Horsepower to WattMetric Horsepower to MilliwattMetric Horsepower to KilowattMetric Horsepower to MegawattMetric Horsepower to GigawattMetric Horsepower to HorsepowerMetric Horsepower to Electric HorsepowerMetric Horsepower to BTU per HourMetric Horsepower to BTU per MinuteMetric Horsepower to BTU per SecondMetric Horsepower to Foot-pound per SecondMetric Horsepower to Foot-pound per MinuteMetric Horsepower to Calorie per SecondMetric Horsepower to Kilocalorie per HourMetric Horsepower to Ton of RefrigerationMetric Horsepower to Erg per SecondMetric Horsepower to Joule per SecondElectric Horsepower to Watt

Other Power Units and Conversions

Explore other power units and their conversion options:

View all power units →

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