The kilojoule, abbreviated as kJ, is a unit of energy in the International System of Units. While it may not be as commonly recognized as calories in everyday conversation, the kilojoule is actually the standard metric unit for quantifying energy. Fascinatingly, 1 kilojoule is equivalent to 0.239 calories, making it a handy unit for converting nutritional information, especially in countries that primarily use the metric system.
Interestingly, the term “joule” is named after the English physicist James Prescott Joule, who studied the nature of heat and discovered its relationship to mechanical work. This unit has applications far beyond nutrition, including physics, chemistry, and engineering, where it measures various types of energy transformations, from kinetic to thermal. Understanding kilojoules can deepen our appreciation of energy, highlighting the intricate balances that power our world and our bodies.
A kilocalorie, often referred to simply as a “calorie” in the context of food and nutrition, is a unit of energy that equals 1,000 small calories. It’s the measure used to indicate how much energy food can provide to the body, crucial for fueling daily activities and maintaining body functions. Interestingly, the term kilocalorie has its roots in the Latin “calor” meaning heat, as it was originally tied to measuring energy in terms of heating.
In the world of nutrition, one kilocalorie is the amount of energy required to raise the temperature of one kilogram of water by one degree Celsius. Despite the prevalence of kilocalories in diet and health discussions, they were initially developed for scientific purposes during studies on thermodynamics in the 19th century. So, every time you check the calorie content on a food label, you’re engaging with a concept that has been bridging chemistry, physics, and nutrition for centuries!
Kilojoules | Kilocalories |
---|---|
0
kJ
|
0
kcal
|
10
kJ
|
2.39006
kcal
|
20
kJ
|
4.78011
kcal
|
30
kJ
|
7.17017
kcal
|
40
kJ
|
9.56023
kcal
|
50
kJ
|
11.95029
kcal
|
60
kJ
|
14.34034
kcal
|
70
kJ
|
16.7304
kcal
|
80
kJ
|
19.12046
kcal
|
90
kJ
|
21.51052
kcal
|
100
kJ
|
23.90057
kcal
|
110
kJ
|
26.29063
kcal
|
120
kJ
|
28.68069
kcal
|
130
kJ
|
31.07075
kcal
|
140
kJ
|
33.4608
kcal
|
150
kJ
|
35.85086
kcal
|
160
kJ
|
38.24092
kcal
|
170
kJ
|
40.63098
kcal
|
180
kJ
|
43.02103
kcal
|
190
kJ
|
45.41109
kcal
|
200
kJ
|
47.80115
kcal
|
210
kJ
|
50.1912
kcal
|
220
kJ
|
52.58126
kcal
|
230
kJ
|
54.97132
kcal
|
240
kJ
|
57.36138
kcal
|
250
kJ
|
59.75143
kcal
|
260
kJ
|
62.14149
kcal
|
270
kJ
|
64.53155
kcal
|
280
kJ
|
66.92161
kcal
|
290
kJ
|
69.31166
kcal
|
300
kJ
|
71.70172
kcal
|
310
kJ
|
74.09178
kcal
|
320
kJ
|
76.48184
kcal
|
330
kJ
|
78.87189
kcal
|
340
kJ
|
81.26195
kcal
|
350
kJ
|
83.65201
kcal
|
360
kJ
|
86.04207
kcal
|
370
kJ
|
88.43212
kcal
|
380
kJ
|
90.82218
kcal
|
390
kJ
|
93.21224
kcal
|
400
kJ
|
95.60229
kcal
|
410
kJ
|
97.99235
kcal
|
420
kJ
|
100.38241
kcal
|
430
kJ
|
102.77247
kcal
|
440
kJ
|
105.16252
kcal
|
450
kJ
|
107.55258
kcal
|
460
kJ
|
109.94264
kcal
|
470
kJ
|
112.3327
kcal
|
480
kJ
|
114.72275
kcal
|
490
kJ
|
117.11281
kcal
|
500
kJ
|
119.50287
kcal
|
510
kJ
|
121.89293
kcal
|
520
kJ
|
124.28298
kcal
|
530
kJ
|
126.67304
kcal
|
540
kJ
|
129.0631
kcal
|
550
kJ
|
131.45315
kcal
|
560
kJ
|
133.84321
kcal
|
570
kJ
|
136.23327
kcal
|
580
kJ
|
138.62333
kcal
|
590
kJ
|
141.01338
kcal
|
600
kJ
|
143.40344
kcal
|
610
kJ
|
145.7935
kcal
|
620
kJ
|
148.18356
kcal
|
630
kJ
|
150.57361
kcal
|
640
kJ
|
152.96367
kcal
|
650
kJ
|
155.35373
kcal
|
660
kJ
|
157.74379
kcal
|
670
kJ
|
160.13384
kcal
|
680
kJ
|
162.5239
kcal
|
690
kJ
|
164.91396
kcal
|
700
kJ
|
167.30402
kcal
|
710
kJ
|
169.69407
kcal
|
720
kJ
|
172.08413
kcal
|
730
kJ
|
174.47419
kcal
|
740
kJ
|
176.86424
kcal
|
750
kJ
|
179.2543
kcal
|
760
kJ
|
181.64436
kcal
|
770
kJ
|
184.03442
kcal
|
780
kJ
|
186.42447
kcal
|
790
kJ
|
188.81453
kcal
|
800
kJ
|
191.20459
kcal
|
810
kJ
|
193.59465
kcal
|
820
kJ
|
195.9847
kcal
|
830
kJ
|
198.37476
kcal
|
840
kJ
|
200.76482
kcal
|
850
kJ
|
203.15488
kcal
|
860
kJ
|
205.54493
kcal
|
870
kJ
|
207.93499
kcal
|
880
kJ
|
210.32505
kcal
|
890
kJ
|
212.71511
kcal
|
900
kJ
|
215.10516
kcal
|
910
kJ
|
217.49522
kcal
|
920
kJ
|
219.88528
kcal
|
930
kJ
|
222.27533
kcal
|
940
kJ
|
224.66539
kcal
|
950
kJ
|
227.05545
kcal
|
960
kJ
|
229.44551
kcal
|
970
kJ
|
231.83556
kcal
|
980
kJ
|
234.22562
kcal
|
990
kJ
|
236.61568
kcal
|
1000
kJ
|
239.00574
kcal
|
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