Energy Converter
Calories to Kilojoules Converter
Calories to Kilojoules with a fast local calculator, clear formula, and practical examples.
Quick answer
1 Cal = 4.184 kJ
Convert Calories to Kilojoules using the formula shown below. This energy converter is useful for nutrition labels, meal tracking, workouts, and science calculations.
Energy
Calories to Kilojoules Converter
Try common values
Unit relationship: 1 Cal = 4.184 kJ and 1 kJ = 0.239 Cal.
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Unit scale
Equivalent Energy Values
Compare energy values across calories, kilojoules, joules, and watt-hours.
| Unit | Value |
|---|---|
| Kilowatt-hours(kWh) | 0.001162 |
| Watt-hours(Wh) | 1.162222 |
| British Thermal Units(BTU) | 3.965651 |
| Kilojoules(kJ) | 4.184 |
| Food Calories(Cal) | 1 |
| Small Calories(cal) | 1,000 |
| Joules(J) | 4,184 |
Formula
kilojoules = calories x 4.184
This calculator uses the standard conversion formula and rounds the final answer to 4 decimal places.
Formula explorer
How the Cal to kJ formula works
1. Formula
kilojoules = calories x 4.184
2. Worked example
1 Cal = 4.184 kJ
Start with 1 calories, apply the formula, then round the result.
3. Reverse check
Kilojoules to Calories Converter
Use the reverse converter to check the answer or go from kilojoules back to calories.
This conversion multiplies the calories value by the factor shown in the formula to get kilojoules.
When to Use This Converter
Use this converter when you need a quick answer for everyday measurements, unit comparisons, worksheets, recipes, product listings, travel planning, or project notes.
For best results, enter the numeric value only. The conversion runs locally in your browser.
Student mode
Explain this conversion simply
Get a short classroom-style explanation. If AI is not configured, EasyConvertAll uses a local explanation.
Common Tools Used to Measure Energy
Energy values often come from food labels, appliance labels, or utility readings.
Food calories and physical small calories are different; use the unit shown on the source.
Example Conversions
| Calories | Kilojoules |
|---|---|
| 1 Cal | 4.184 kJ |
| 50 Cal | 209.2 kJ |
| 100 Cal | 418.4 kJ |
| 250 Cal | 1,046 kJ |
| 500 Cal | 2,092 kJ |
| 2,000 Cal | 8,368 kJ |
Printable conversion table
Calories to Kilojoules chart, 1 to 100
Scan common values, print the table, copy it, or download a CSV for worksheets, notes, spreadsheets, and quick reference.
| Calories (Cal) | Kilojoules (kJ) |
|---|---|
| 1 Cal | 4.184 kJ |
| 2 Cal | 8.368 kJ |
| 3 Cal | 12.552 kJ |
| 4 Cal | 16.736 kJ |
| 5 Cal | 20.92 kJ |
| 6 Cal | 25.104 kJ |
| 7 Cal | 29.288 kJ |
| 8 Cal | 33.472 kJ |
| 9 Cal | 37.656 kJ |
| 10 Cal | 41.84 kJ |
| 11 Cal | 46.024 kJ |
| 12 Cal | 50.208 kJ |
| 13 Cal | 54.392 kJ |
| 14 Cal | 58.576 kJ |
| 15 Cal | 62.76 kJ |
| 16 Cal | 66.944 kJ |
| 17 Cal | 71.128 kJ |
| 18 Cal | 75.312 kJ |
| 19 Cal | 79.496 kJ |
| 20 Cal | 83.68 kJ |
| 21 Cal | 87.864 kJ |
| 22 Cal | 92.048 kJ |
| 23 Cal | 96.232 kJ |
| 24 Cal | 100.416 kJ |
| 25 Cal | 104.6 kJ |
| 26 Cal | 108.784 kJ |
| 27 Cal | 112.968 kJ |
| 28 Cal | 117.152 kJ |
| 29 Cal | 121.336 kJ |
| 30 Cal | 125.52 kJ |
| 31 Cal | 129.704 kJ |
| 32 Cal | 133.888 kJ |
| 33 Cal | 138.072 kJ |
| 34 Cal | 142.256 kJ |
| 35 Cal | 146.44 kJ |
| 36 Cal | 150.624 kJ |
| 37 Cal | 154.808 kJ |
| 38 Cal | 158.992 kJ |
| 39 Cal | 163.176 kJ |
| 40 Cal | 167.36 kJ |
| 41 Cal | 171.544 kJ |
| 42 Cal | 175.728 kJ |
| 43 Cal | 179.912 kJ |
| 44 Cal | 184.096 kJ |
| 45 Cal | 188.28 kJ |
| 46 Cal | 192.464 kJ |
| 47 Cal | 196.648 kJ |
| 48 Cal | 200.832 kJ |
| 49 Cal | 205.016 kJ |
| 50 Cal | 209.2 kJ |
| 51 Cal | 213.384 kJ |
| 52 Cal | 217.568 kJ |
| 53 Cal | 221.752 kJ |
| 54 Cal | 225.936 kJ |
| 55 Cal | 230.12 kJ |
| 56 Cal | 234.304 kJ |
| 57 Cal | 238.488 kJ |
| 58 Cal | 242.672 kJ |
| 59 Cal | 246.856 kJ |
| 60 Cal | 251.04 kJ |
| 61 Cal | 255.224 kJ |
| 62 Cal | 259.408 kJ |
| 63 Cal | 263.592 kJ |
| 64 Cal | 267.776 kJ |
| 65 Cal | 271.96 kJ |
| 66 Cal | 276.144 kJ |
| 67 Cal | 280.328 kJ |
| 68 Cal | 284.512 kJ |
| 69 Cal | 288.696 kJ |
| 70 Cal | 292.88 kJ |
| 71 Cal | 297.064 kJ |
| 72 Cal | 301.248 kJ |
| 73 Cal | 305.432 kJ |
| 74 Cal | 309.616 kJ |
| 75 Cal | 313.8 kJ |
| 76 Cal | 317.984 kJ |
| 77 Cal | 322.168 kJ |
| 78 Cal | 326.352 kJ |
| 79 Cal | 330.536 kJ |
| 80 Cal | 334.72 kJ |
| 81 Cal | 338.904 kJ |
| 82 Cal | 343.088 kJ |
| 83 Cal | 347.272 kJ |
| 84 Cal | 351.456 kJ |
| 85 Cal | 355.64 kJ |
| 86 Cal | 359.824 kJ |
| 87 Cal | 364.008 kJ |
| 88 Cal | 368.192 kJ |
| 89 Cal | 372.376 kJ |
| 90 Cal | 376.56 kJ |
| 91 Cal | 380.744 kJ |
| 92 Cal | 384.928 kJ |
| 93 Cal | 389.112 kJ |
| 94 Cal | 393.296 kJ |
| 95 Cal | 397.48 kJ |
| 96 Cal | 401.664 kJ |
| 97 Cal | 405.848 kJ |
| 98 Cal | 410.032 kJ |
| 99 Cal | 414.216 kJ |
| 100 Cal | 418.4 kJ |
Frequently Asked Questions
How do I convert calories to kilojoules?
Use the formula kilojoules = calories x 4.184. Enter a value in the calculator above to get a rounded result instantly.
Is this converter free?
Yes. The conversion runs locally in your browser, with no account, database, or paid API.
How many decimal places are shown?
Results are rounded to 4 decimal places for a practical balance of accuracy and readability.