NiftyRecipe Online energy conversion
BTU/kcal 0.252164 kJ/MJ 0.001 BTU/kJ 1.055056 kJ/cal 239.005736 kWh/kcal 860.42065 kJ/kcal 0.239006
kJ / J

1 kilojoule in joule

1000 joule

1 kJ = 1000 J · factor

Reverse: 1 joule ≈ 0.001 kilojoule. Use the reference table for common values.

Enter a value and click Calculate - opens the page with the new result

Common values

joule to kilojoule

Same amount, other units

1 kilojoule → kcal 1 kilojoule → BTU 1 kilojoule → cal 1 kilojoule → kWh 1 kilojoule → MJ
Formula: kilojoule to joule

J = kJ × 1000 (1 KJ = 1000 J)

Reference values: kilojoule → joule
kJ J
1 kJ 1000 J
100 kJ 100000 J
200 kJ 200000 J
500 kJ 500000 J
1000 kJ 1000000 J
2000 kJ 2000000 J

All amounts for this pair

FAQ for kJ → J
1 kilojoule in joule

NiftyRecipe converts 1 kilojoule to 1000 joule with a fixed SI-linked factor.

Kilojoules and megajoules describe energy on a scientific scale. The ratio applied here is 1 kilojoule = 1000 joule, so this amount is 1000 joule. Reverse check: 1 joule ≈ 0.001 kilojoule. That helps when a lab notebook or spreadsheet only lists one column.

Change the value in the calculator for homework, datasheets or rough process estimates. The wording stays technical on purpose so these pages read differently from food-label articles on the same site.