Energy Converter

1 kwh equals 3600000 j.

How it works

• Expressed the source unit (kilowatt-hour (kWh)) in joules.
• Divided by the target unit (joule (J)) expressed in joules.
• Rounded the result to 12 significant digits.

1 kwh = 3600000 j

• Calories are thermochemical (4.184 J); the International Table BTU is 1055.05585262 J.

Methodology

1. Express every unit as an exact factor to the joule base.
2. Multiply the input by the source factor and divide by the target factor.
3. Use the exact SI definitions (the electronvolt is exactly 1.602176634 × 10⁻¹⁹ J; 1 Wh = 3600 J) and the International Table BTU so no rounded factor is introduced.
4. Round the result to 12 significant digits, which keeps a convert-then-convert-back operation within floating-point tolerance.

Usage

1. Enter the energy value.
2. Choose the source and target energy units.
3. Read the converted value and the conversion formula.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

Kilowatt-hours to joules

{
  "value": 1,
  "from": "kwh",
  "to": "j"
}

Kilocalories to joules

{
  "value": 1,
  "from": "kcal",
  "to": "j"
}

Joules to calories

{
  "value": 4.184,
  "from": "j",
  "to": "cal"
}

Watt-hours to joules

{
  "value": 1,
  "from": "wh",
  "to": "j"
}

Limitations

Exact energy factors

The joule is the SI derived unit of energy (1 J = 1 kg·m²/s²), and electrical energy follows from it: 1 Wh = 3600 J exactly. The electronvolt is fixed by the 2019 SI redefinition at 1.602176634 × 10⁻¹⁹ J.

Mechanical and thermal units are defined from exact lengths and masses: the foot-pound is 0.3048 m × 4.4482216152605 N = 1.3558179483314004 J, and the International Table BTU is the exact 1055.05585262 J.