Calorie per Second to Kilowatt Converter

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.