MeasureCalc

Convert Calorie (cal) to Joule (J)

Category: Energy

4.184 j

1 cal = 4.184 j

High-precision rounding: 6 decimals

How to convert calorie (cal) to joule (j)

Energy is the capacity to do work. Joules form the SI base; Wh/kWh align with metering and batteries; calories and BTU survive in nutrition and HVAC. Conversions bridge mechanical, thermal, and electrical perspectives.

This converter calculates Calorie (cal) to Joule (J) values by using the correct conversion rule for the Energy category. For linear units, standardized factors are used. For temperature, the calculator applies the proper formula with offsets.

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Quick conversion table

Handy values for Calorie (cal) to Joule (J). Click a value to open that exact result.

Calorie (cal) Joule (J)
1 4.184
0.5 2.092
2.5 10.46
10 41.84

Conversion formula

Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).

Common mistakes

  • Confusing calorie (cal) with kilocalorie (kcal) on nutrition labels.
  • Treating BTU definitions interchangeably without noting standard (IT vs other).

Unit facts

  • Calorie (cal): A small calorie (cal) heats 1 g of water by 1 °C; nutrition ‘Calorie’ means kilocalorie (kcal).
  • Joule (J): Joule (J) is the SI unit of energy: 1 J = 1 N·m = 1 kg·m²/s².

About Calorie (cal)

Calorie (cal)

Energy to raise 1 g of water by 1 °C; several legacy variants exist. In nutrition, ‘calorie’ often means kilocalorie.

History: Thermochemistry used multiple definitions; modern practice relates calories to joules (1 cal ≈ 4.184 J).

About Joule (J)

Joule (J)

SI energy unit equal to N·m. Fundamental in physics, electronics (J = W·s), and thermodynamics.

History: Named after James P. Joule. Became universal with SI coherence across mechanical and electrical domains.

Frequently asked questions

How many Joule (J) are in one Calorie (cal)?
1 Calorie (cal) equals 4.184 Joule (J).
Is Calorie (cal) to Joule (J) conversion exact?
Many unit conversions are exact by definition, while others use standardized conversion constants.
What is the fastest way to convert Calorie (cal) to Joule (J)?
Enter a value in Calorie (cal), choose Joule (J) as the target unit, and the calculator will instantly return the result.

Convert Calorie (cal) to other units

Convert other units to Joule (J)