kJ / J

Kilojoule to Joule converter

1 kJ = 1000 J

This is the Kilojoule to Joule converter. The factor is fixed: 1 kJ = 1000.0 J. Open a common amount below, or type any value — only selected amounts are indexed.

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

Common conversions

1 kJ → 1000 J

FAQ for kJ → J

How many kJ in 1 MJ?

Exactly 1000 kJ. Larger or mixed conversions still follow the fixed chain used by the calculator.

When is MJ more practical than kJ?

For larger totals-process energy, some statistical tables. Food labels usually stay in kJ or kcal.

Manual formula?

J = kJ × 1000 (1 KJ = 1000 J)

Reverse factor?

1 joule ≈ 0.001 kilojoule.

How much is 1 kilojoule in joule?

1000 joule (1 kilojoule = 1000 joule).

How the Kilojoule to Joule converter works

This hub describes the pair, not a single number. Pages like 1, 10 or 100 Kilojoule answer exact searches.

NiftyRecipe uses thermochemical energy factors (for example 1 kcal = 4184 J). Results do not change with the time of day.