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Energy Converter
Joules to Kilojoules (j to kj)
Formula: Kilojoule (kJ) = Joule (J) × 1000.000000
Kilojoules to Joules (kj to j)
Formula: Joule (J) = Kilojoule (kJ) × 0.001000
Joules to Calories (j to cal)
Formula: Calorie (cal) = Joule (J) × 4.184000
Calories to Joules (cal to j)
Formula: Joule (J) = Calorie (cal) × 0.239006
About Energy Conversion, Units, and Formulas
Energy conversions are crucial for understanding and comparing energy values in different contexts, such as scientific experiments, nutritional information, or electricity consumption. The most common energy units include:
- Joules (J): The SI unit of energy, widely used in physics and engineering.
- Calories (cal): Often used in chemistry and nutrition to measure heat energy.
- Kilocalories (kcal): Equivalent to 1,000 calories, commonly used in food energy measurements.
- British Thermal Units (BTU): Used in heating and cooling systems, especially in the US.
- Electronvolts (eV): Used in particle physics to measure energy at the atomic and subatomic levels.
- Kilowatt-hours (kWh): Used to measure electrical energy consumption.
To convert between these units, use the formulas provided in the sections below.
Instantly convert between all major energy units like joules (J), calories (cal), kilocalories (kcal), British thermal units (BTU), electronvolts (eV), kilowatt-hours (kWh), and more. Try conversions such as joules to calories, calories to joules, BTU to joules, or kilowatt-hours to joules below!
Joules and Calories Conversion
Joules and calories are commonly used to measure energy in scientific and nutritional contexts.
Joules to Calories Table
| J | cal |
|---|---|
| 1 | 0.2390 |
| 5 | 1.1950 |
| 10 | 2.3900 |
| 20 | 4.7800 |
| 50 | 11.9500 |
| 100 | 23.9000 |
Calories to Joules Table
| cal | J |
|---|---|
| 1 | 4.1840 |
| 5 | 20.9200 |
| 10 | 41.8400 |
| 20 | 83.6800 |
| 50 | 209.2000 |
| 100 | 418.4000 |
Conversion Formulas
- Joules to Calories: cal = J / 4.184
- Calories to Joules: J = cal * 4.184
Example Calculation
- Convert 10 J to cal: 10 / 4.184 ≈ 2.390 cal
- Convert 5 cal to J: 5 * 4.184 = 20.92 J
Use our online converter for instant joules to calories or calories to joules conversions!
Joules and Kilocalories Conversion
Kilocalories are often used in nutrition to measure the energy content of food.
Joules to Kilocalories Table
| J | kcal |
|---|---|
| 1 | 0.000239 |
| 5 | 0.001195 |
| 10 | 0.002390 |
| 20 | 0.004780 |
| 50 | 0.011950 |
| 100 | 0.023900 |
Kilocalories to Joules Table
| kcal | J |
|---|---|
| 1 | 4184.0000 |
| 5 | 20920.0000 |
| 10 | 41840.0000 |
| 20 | 83680.0000 |
| 50 | 209200.0000 |
| 100 | 418400.0000 |
Conversion Formulas
- Joules to Kilocalories: kcal = J / 4184
- Kilocalories to Joules: J = kcal * 4184
Example Calculation
- Convert 100 J to kcal: 100 / 4184 ≈ 0.0239 kcal
- Convert 1 kcal to J: 1 * 4184 = 4184 J
Convert joules to kilocalories or kilocalories to joules instantly with our tool!
Joules and British Thermal Units (BTU) Conversion
BTU is commonly used in heating and cooling systems, especially in the US.
Joules to BTU Table
| J | BTU |
|---|---|
| 1 | 0.000948 |
| 5 | 0.004740 |
| 10 | 0.009480 |
| 20 | 0.018960 |
| 50 | 0.047400 |
| 100 | 0.094800 |
BTU to Joules Table
| BTU | J |
|---|---|
| 1 | 1055.0600 |
| 5 | 5275.3000 |
| 10 | 10550.6000 |
| 20 | 21101.2000 |
| 50 | 52753.0000 |
| 100 | 105506.0000 |
Conversion Formulas
- Joules to BTU: BTU = J / 1055.06
- BTU to Joules: J = BTU * 1055.06
Example Calculation
- Convert 50 J to BTU: 50 / 1055.06 ≈ 0.0474 BTU
- Convert 10 BTU to J: 10 * 1055.06 = 10550.6 J
Use our joules to BTU and BTU to joules converter today!
Joules and Electronvolts (eV) Conversion
Electronvolts are used in particle physics to measure energy at the atomic and subatomic levels.
Joules to Electronvolts Table
| J | eV |
|---|---|
| 1 | 6.2415e+18 |
| 5 | 3.1208e+19 |
| 10 | 6.2415e+19 |
| 20 | 1.2483e+20 |
| 50 | 3.1208e+20 |
| 100 | 6.2415e+20 |
Electronvolts to Joules Table
| eV | J |
|---|---|
| 1 | 1.6022e-19 |
| 5 | 8.0110e-19 |
| 10 | 1.6022e-18 |
| 20 | 3.2044e-18 |
| 50 | 8.0110e-18 |
| 100 | 1.6022e-17 |
Conversion Formulas
- Joules to Electronvolts: eV = J * 6.2415e18
- Electronvolts to Joules: J = eV * 1.6022e-19
Example Calculation
- Convert 1 J to eV: 1 * 6.2415e18 = 6.2415e18 eV
- Convert 100 eV to J: 100 * 1.6022e-19 = 1.6022e-17 J
Try our joules to electronvolts and electronvolts to joules converter now!
Joules and Kilowatt-hours (kWh) Conversion
Kilowatt-hours are commonly used to measure electrical energy consumption.
Joules to Kilowatt-hours Table
| J | kWh |
|---|---|
| 1 | 2.7778e-7 |
| 5 | 1.3889e-6 |
| 10 | 2.7778e-6 |
| 20 | 5.5556e-6 |
| 50 | 1.3889e-5 |
| 100 | 2.7778e-5 |
Kilowatt-hours to Joules Table
| kWh | J |
|---|---|
| 1 | 3600000 |
| 5 | 18000000 |
| 10 | 36000000 |
| 20 | 72000000 |
| 50 | 180000000 |
| 100 | 360000000 |
Conversion Formulas
- Joules to Kilowatt-hours: kWh = J / 3600000
- Kilowatt-hours to Joules: J = kWh * 3600000
Example Calculation
- Convert 100 J to kWh: 100 / 3600000 = 2.7778e-5 kWh
- Convert 1 kWh to J: 1 * 3600000 = 3600000 J
Use our joules to kilowatt-hours and kilowatt-hours to joules converter today!
About Energy Units and Systems
Energy units vary across different fields and applications. The SI unit, joule (J), is universally accepted in science and engineering. Calories (cal) and kilocalories (kcal) are often used in chemistry and nutrition. British thermal units (BTU) are prevalent in heating and cooling industries, especially in the US. Electronvolts (eV) are used in particle physics, and kilowatt-hours (kWh) are standard for measuring electrical energy consumption. Our online converter supports all these units for seamless conversions.
Why Use an Online Energy Converter?
An online energy converter saves time, eliminates errors, and provides instant, exact results. It’s perfect for scientists, engineers, nutritionists, or anyone needing quick conversions between energy units like joules, calories, kilocalories, BTU, electronvolts, kilowatt-hours, and more. Try conversions like joules to calories, calories to joules, BTU to joules, kilowatt-hours to joules, and more below!