Energy conversion

kcal to kilojoules conversion

Convert kilocalories (kcal) to kilojoules (kJ). Exact thermochemical: 1 kcal = 4.184 kJ. Free online tool — no sign-up. Runs locally in your browser.

Instant result

Result

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Enter values to convert.

Inputs —

Mode —

Formula —

Formulas

Core equations used by this converter.

kcal → kJkJ = kcal × 4.184

Exact factor1 kcal = 4.184 kJ

kJ → kcalkcal = kJ × 1/4.184

iLinear conversion using factor 4.184. Prefer the exact factor over rounded multipliers when precision matters.

How to use

1

Choose kcal → kJ or kJ → kcal

Use the tabs to switch direction. Forward mode needs kilocalories; reverse uses the opposite unit.

2

Enter the value

Type a non-negative value in the active unit field.

3

Convert and read the result

Use Convert or let the result update automatically.

Example conversions

Common values with formula and result.

ϟ

1 kcal to kJ

1 kcal to kJ

1 × 4.184 = 4.184 kJ

4.184 kJ

ϟ

100 kcal to kJ

100 kcal to kJ

100 × 4.184 = 418.4 kJ

418.4 kJ

ϟ

2000 kcal (daily intake ballpark) to kJ

2000 kcal (daily intake ballpark) to kJ

2000 × 4.184 = 8368 kJ

8368 kJ

ϟ

Reverse: 4.184 kJ → kcal

Reverse: 4.184 kJ → kcal

4.184 ÷ 4.184 = 1 kcal

1 kcal

kcal to kilojoules conversion specification

Version 1.1.0 · Engine tested

Calculation status

Engine tested 4 published cases
Named expert review Not performed
Calculation version 1.1.0

Definition: Kilocalories (kcal) converts to kJ using a fixed linear factor. Convert kilocalories (kcal) to kilojoules (kJ). Exact thermochemical: 1 kcal = 4.184 kJ. Formula, examples, chart.
What it calculates: Value between kcal and kJ. Switch direction with the converter tabs.
Inputs: Kilocalories (kcal) or reverse unit (kJ)
Outputs: Converted value in kJ or kcal
Formula: kJ = kcal × 4.184 · 1 kcal = 4.184 kJ
kcal to kilojoules conversion table: Kilocalories (kcal) Kilojoules (kJ)
1 kcal 4.184 kJ
10 kcal 41.84 kJ
50 kcal 209.2 kJ
100 kcal 418.4 kJ
250 kcal 1046 kJ
500 kcal 2092 kJ
1000 kcal 4184 kJ
2000 kcal 8368 kJ
Assumptions: Conversion runs locally in the browser; values are not uploaded.
Uses the standard factor/definition for these units.
Units: kcal → kJ
kJ → kcal
Boundary conditions: Empty or non-numeric input yields no valid result.
Non-negative values are expected for physical quantities.
Example: 1 kcal → 4.184 kJ
Validation cases: 1 kcal → 4.184 kJ
10 kcal → 41.84 kJ
50 kcal → 209.2 kJ
100 kcal → 418.4 kJ
Sources: SI / international unit definitions where applicable
CalculatorX conversion factors (local runtime)
Calculation version: 1.1.0

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for kcal to kilojoules conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using kcal to kilojoules conversion?

Use 1 kcal = 4.184 kJ. Example: 1 kcal to kJ → 4.184 kJ.

Can I switch direction?

Use the converter tabs when available, or open the related reverse tool from Related.

Does this run online or locally?

Calculation runs locally in your browser. Values are not uploaded.

How precise are the results?

Results follow the formulas on this page. Round to the precision your use case needs.