CalKit

Energy Converter

Convert energy units.

J
줄 (J) 기준값
1000.0000J

모든 에너지 단위 변환

줄 (J)1000.000000 J
킬로줄 (kJ)1.000000 kJ
칼로리 (cal)239.005736 cal
킬로칼로리 (kcal)0.239006 kcal
와트시 (Wh)0.277778 Wh
킬로와트시 (kWh)0.000278 kWh
BTU0.947813 BTU

Overview

Convert between joules (J), calories (cal), kilowatt-hours (kWh), BTU, electron volts (eV), and more. Essential for electricity bills, food nutrition, and scientific energy calculations.

Formula

1 J = 0.239006 cal
1 cal = 4.184 J
1 kcal = 1000 cal = 4184 J
1 kWh = 3,600,000 J = 3.6 MJ
1 BTU = 1055.06 J = 252.164 cal
1 eV = 1.60218 × 10⁻¹⁹ J

How to Use

  1. 1Enter the energy value to convert.
  2. 2Select the source unit (J, cal, kWh, BTU, etc.).
  3. 3Select the target unit.
  4. 4View the converted result.

Tips

  • ✔Food 'Calories' (capital C) are actually kilocalories (kcal).
  • ✔Household electricity is billed in kWh.
  • ✔1 kWh = 860 kcal, useful for comparing electrical and thermal energy.
  • ✔BTU is commonly used in the US for HVAC system capacity ratings.

FAQ

Q. What is the difference between joules and calories?

The joule (J) is the SI unit of energy. A calorie (cal) is the energy needed to raise 1 g of water by 1°C. 1 cal = 4.184 J.

Q. Are food Calories the same as scientific calories?

No. A food Calorie (capital C) is actually a kilocalorie (kcal) = 1000 cal. The scientific calorie (lowercase c) is 1/1000 of a food Calorie.

Q. Is kWh a unit of power or energy?

kWh (kilowatt-hour) is a unit of energy, not power. It represents the energy consumed by using 1 kW of power for 1 hour. Power (W) is the rate of energy use.

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