Convert kilocalories to kilojoules (kcal to kJ)

One kilocalorie is exactly 4.184 kilojoules. Both figures sit side by side on every European label, and neither is truer than the other: it is the same energy, counted twice.

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How to convert kilocalories to kilojoules

Multiply by 4.184, or by 4.2 for mental arithmetic. Two thousand kilocalories is 8368 kilojoules, and the approximation gives 8400, less than half a per cent out.

kJ = kcal × 4.184The other way round, divide by 4.184, or by 4.2 in your head.

Where these two units are used

The capital-C Calorie on American labels is a kilocalorie, a thousand physical calories: a bar listed at 200 Calories really holds 200,000 calories in the physicist's sense. The kilojoule is compulsory on European food labels, where the kilocalorie may appear beside it but never in its place.

Kilocalories to kilojoules conversion table

50 kcal209.2 kJ
100 kcal418.4 kJ
150 kcal627.6 kJ
200 kcal836.8 kJ
250 kcal1,046.0 kJ
400 kcal1,673.6 kJ
500 kcal2,092.0 kJ
1,000 kcal4,184.0 kJ
1,500 kcal6,276.0 kJ
2,000 kcal8,368.0 kJ
2,500 kcal10,460.0 kJ
Show every value
  • 1 kcal = 4.184 kJ
  • 2 kcal = 8.368 kJ
  • 3 kcal = 12.552 kJ
  • 4 kcal = 16.736 kJ
  • 5 kcal = 20.92 kJ
  • 6 kcal = 25.104 kJ
  • 7 kcal = 29.288 kJ
  • 8 kcal = 33.472 kJ
  • 9 kcal = 37.656 kJ
  • 10 kcal = 41.84 kJ
  • 11 kcal = 46.024 kJ
  • 12 kcal = 50.208 kJ
  • 13 kcal = 54.392 kJ
  • 14 kcal = 58.576 kJ
  • 15 kcal = 62.76 kJ
  • 16 kcal = 66.944 kJ
  • 17 kcal = 71.128 kJ
  • 18 kcal = 75.312 kJ
  • 19 kcal = 79.496 kJ
  • 20 kcal = 83.68 kJ
  • 21 kcal = 87.864 kJ
  • 22 kcal = 92.048 kJ
  • 23 kcal = 96.232 kJ
  • 24 kcal = 100.416 kJ
  • 25 kcal = 104.6 kJ
  • 26 kcal = 108.784 kJ
  • 27 kcal = 112.968 kJ
  • 28 kcal = 117.152 kJ
  • 29 kcal = 121.336 kJ
  • 30 kcal = 125.52 kJ
  • 31 kcal = 129.704 kJ
  • 32 kcal = 133.888 kJ
  • 33 kcal = 138.072 kJ
  • 34 kcal = 142.256 kJ
  • 35 kcal = 146.44 kJ
  • 36 kcal = 150.624 kJ
  • 37 kcal = 154.808 kJ
  • 38 kcal = 158.992 kJ
  • 39 kcal = 163.176 kJ
  • 40 kcal = 167.36 kJ
  • 41 kcal = 171.544 kJ
  • 42 kcal = 175.728 kJ
  • 43 kcal = 179.912 kJ
  • 44 kcal = 184.096 kJ
  • 45 kcal = 188.28 kJ
  • 46 kcal = 192.464 kJ
  • 47 kcal = 196.648 kJ
  • 48 kcal = 200.832 kJ
  • 49 kcal = 205.016 kJ
  • 50 kcal = 209.2 kJ
  • 51 kcal = 213.384 kJ
  • 52 kcal = 217.568 kJ
  • 53 kcal = 221.752 kJ
  • 54 kcal = 225.936 kJ
  • 55 kcal = 230.12 kJ
  • 56 kcal = 234.304 kJ
  • 57 kcal = 238.488 kJ
  • 58 kcal = 242.672 kJ
  • 59 kcal = 246.856 kJ
  • 60 kcal = 251.04 kJ
  • 61 kcal = 255.224 kJ
  • 62 kcal = 259.408 kJ
  • 63 kcal = 263.592 kJ
  • 64 kcal = 267.776 kJ
  • 65 kcal = 271.96 kJ
  • 66 kcal = 276.144 kJ
  • 67 kcal = 280.328 kJ
  • 68 kcal = 284.512 kJ
  • 69 kcal = 288.696 kJ
  • 70 kcal = 292.88 kJ
  • 71 kcal = 297.064 kJ
  • 72 kcal = 301.248 kJ
  • 73 kcal = 305.432 kJ
  • 74 kcal = 309.616 kJ
  • 75 kcal = 313.8 kJ
  • 76 kcal = 317.984 kJ
  • 77 kcal = 322.168 kJ
  • 78 kcal = 326.352 kJ
  • 79 kcal = 330.536 kJ
  • 80 kcal = 334.72 kJ
  • 81 kcal = 338.904 kJ
  • 82 kcal = 343.088 kJ
  • 83 kcal = 347.272 kJ
  • 84 kcal = 351.456 kJ
  • 85 kcal = 355.64 kJ
  • 86 kcal = 359.824 kJ
  • 87 kcal = 364.008 kJ
  • 88 kcal = 368.192 kJ
  • 89 kcal = 372.376 kJ
  • 90 kcal = 376.56 kJ
  • 91 kcal = 380.744 kJ
  • 92 kcal = 384.928 kJ
  • 93 kcal = 389.112 kJ
  • 94 kcal = 393.296 kJ
  • 95 kcal = 397.48 kJ
  • 96 kcal = 401.664 kJ
  • 97 kcal = 405.848 kJ
  • 98 kcal = 410.032 kJ
  • 99 kcal = 414.216 kJ
  • 100 kcal = 418.4 kJ
  • 101 kcal = 422.584 kJ
  • 102 kcal = 426.768 kJ
  • 103 kcal = 430.952 kJ
  • 104 kcal = 435.136 kJ
  • 105 kcal = 439.32 kJ
  • 106 kcal = 443.504 kJ
  • 107 kcal = 447.688 kJ
  • 108 kcal = 451.872 kJ
  • 109 kcal = 456.056 kJ
  • 110 kcal = 460.24 kJ
  • 111 kcal = 464.424 kJ
  • 112 kcal = 468.608 kJ
  • 113 kcal = 472.792 kJ
  • 114 kcal = 476.976 kJ
  • 115 kcal = 481.16 kJ
  • 116 kcal = 485.344 kJ
  • 117 kcal = 489.528 kJ
  • 118 kcal = 493.712 kJ
  • 119 kcal = 497.896 kJ
  • 120 kcal = 502.08 kJ
  • 121 kcal = 506.264 kJ
  • 122 kcal = 510.448 kJ
  • 123 kcal = 514.632 kJ
  • 124 kcal = 518.816 kJ
  • 125 kcal = 523 kJ
  • 126 kcal = 527.184 kJ
  • 127 kcal = 531.368 kJ
  • 128 kcal = 535.552 kJ
  • 129 kcal = 539.736 kJ
  • 130 kcal = 543.92 kJ
  • 131 kcal = 548.104 kJ
  • 132 kcal = 552.288 kJ
  • 133 kcal = 556.472 kJ
  • 134 kcal = 560.656 kJ
  • 135 kcal = 564.84 kJ
  • 136 kcal = 569.024 kJ
  • 137 kcal = 573.208 kJ
  • 138 kcal = 577.392 kJ
  • 139 kcal = 581.576 kJ
  • 140 kcal = 585.76 kJ
  • 141 kcal = 589.944 kJ
  • 142 kcal = 594.128 kJ
  • 143 kcal = 598.312 kJ
  • 144 kcal = 602.496 kJ
  • 145 kcal = 606.68 kJ
  • 146 kcal = 610.864 kJ
  • 147 kcal = 615.048 kJ
  • 148 kcal = 619.232 kJ
  • 149 kcal = 623.416 kJ
  • 150 kcal = 627.6 kJ
  • 151 kcal = 631.784 kJ
  • 152 kcal = 635.968 kJ
  • 153 kcal = 640.152 kJ
  • 154 kcal = 644.336 kJ
  • 155 kcal = 648.52 kJ
  • 156 kcal = 652.704 kJ
  • 157 kcal = 656.888 kJ
  • 158 kcal = 661.072 kJ
  • 159 kcal = 665.256 kJ
  • 160 kcal = 669.44 kJ
  • 161 kcal = 673.624 kJ
  • 162 kcal = 677.808 kJ
  • 163 kcal = 681.992 kJ
  • 164 kcal = 686.176 kJ
  • 165 kcal = 690.36 kJ
  • 166 kcal = 694.544 kJ
  • 167 kcal = 698.728 kJ
  • 168 kcal = 702.912 kJ
  • 169 kcal = 707.096 kJ
  • 170 kcal = 711.28 kJ
  • 171 kcal = 715.464 kJ
  • 172 kcal = 719.648 kJ
  • 173 kcal = 723.832 kJ
  • 174 kcal = 728.016 kJ
  • 175 kcal = 732.2 kJ
  • 176 kcal = 736.384 kJ
  • 177 kcal = 740.568 kJ
  • 178 kcal = 744.752 kJ
  • 179 kcal = 748.936 kJ
  • 180 kcal = 753.12 kJ
  • 181 kcal = 757.304 kJ
  • 182 kcal = 761.488 kJ
  • 183 kcal = 765.672 kJ
  • 184 kcal = 769.856 kJ
  • 185 kcal = 774.04 kJ
  • 186 kcal = 778.224 kJ
  • 187 kcal = 782.408 kJ
  • 188 kcal = 786.592 kJ
  • 189 kcal = 790.776 kJ
  • 190 kcal = 794.96 kJ
  • 191 kcal = 799.144 kJ
  • 192 kcal = 803.328 kJ
  • 193 kcal = 807.512 kJ
  • 194 kcal = 811.696 kJ
  • 195 kcal = 815.88 kJ
  • 196 kcal = 820.064 kJ
  • 197 kcal = 824.248 kJ
  • 198 kcal = 828.432 kJ
  • 199 kcal = 832.616 kJ
  • 200 kcal = 836.8 kJ
  • 205 kcal = 857.72 kJ
  • 210 kcal = 878.64 kJ
  • 215 kcal = 899.56 kJ
  • 220 kcal = 920.48 kJ
  • 225 kcal = 941.4 kJ
  • 230 kcal = 962.32 kJ
  • 235 kcal = 983.24 kJ
  • 240 kcal = 1,004.16 kJ
  • 245 kcal = 1,025.08 kJ
  • 250 kcal = 1,046 kJ
  • 255 kcal = 1,066.92 kJ
  • 260 kcal = 1,087.84 kJ
  • 265 kcal = 1,108.76 kJ
  • 270 kcal = 1,129.68 kJ
  • 275 kcal = 1,150.6 kJ
  • 280 kcal = 1,171.52 kJ
  • 285 kcal = 1,192.44 kJ
  • 290 kcal = 1,213.36 kJ
  • 295 kcal = 1,234.28 kJ
  • 300 kcal = 1,255.2 kJ
  • 305 kcal = 1,276.12 kJ
  • 310 kcal = 1,297.04 kJ
  • 315 kcal = 1,317.96 kJ
  • 320 kcal = 1,338.88 kJ
  • 325 kcal = 1,359.8 kJ
  • 330 kcal = 1,380.72 kJ
  • 335 kcal = 1,401.64 kJ
  • 340 kcal = 1,422.56 kJ
  • 345 kcal = 1,443.48 kJ
  • 350 kcal = 1,464.4 kJ
  • 355 kcal = 1,485.32 kJ
  • 360 kcal = 1,506.24 kJ
  • 365 kcal = 1,527.16 kJ
  • 370 kcal = 1,548.08 kJ
  • 375 kcal = 1,569 kJ
  • 380 kcal = 1,589.92 kJ
  • 385 kcal = 1,610.84 kJ
  • 390 kcal = 1,631.76 kJ
  • 395 kcal = 1,652.68 kJ
  • 400 kcal = 1,673.6 kJ
  • 405 kcal = 1,694.52 kJ
  • 410 kcal = 1,715.44 kJ
  • 415 kcal = 1,736.36 kJ
  • 420 kcal = 1,757.28 kJ
  • 425 kcal = 1,778.2 kJ
  • 430 kcal = 1,799.12 kJ
  • 435 kcal = 1,820.04 kJ
  • 440 kcal = 1,840.96 kJ
  • 445 kcal = 1,861.88 kJ
  • 450 kcal = 1,882.8 kJ
  • 455 kcal = 1,903.72 kJ
  • 460 kcal = 1,924.64 kJ
  • 465 kcal = 1,945.56 kJ
  • 470 kcal = 1,966.48 kJ
  • 475 kcal = 1,987.4 kJ
  • 480 kcal = 2,008.32 kJ
  • 485 kcal = 2,029.24 kJ
  • 490 kcal = 2,050.16 kJ
  • 495 kcal = 2,071.08 kJ
  • 500 kcal = 2,092 kJ
  • 510 kcal = 2,133.84 kJ
  • 520 kcal = 2,175.68 kJ
  • 530 kcal = 2,217.52 kJ
  • 540 kcal = 2,259.36 kJ
  • 550 kcal = 2,301.2 kJ
  • 560 kcal = 2,343.04 kJ
  • 570 kcal = 2,384.88 kJ
  • 580 kcal = 2,426.72 kJ
  • 590 kcal = 2,468.56 kJ
  • 600 kcal = 2,510.4 kJ
  • 610 kcal = 2,552.24 kJ
  • 620 kcal = 2,594.08 kJ
  • 630 kcal = 2,635.92 kJ
  • 640 kcal = 2,677.76 kJ
  • 650 kcal = 2,719.6 kJ
  • 660 kcal = 2,761.44 kJ
  • 670 kcal = 2,803.28 kJ
  • 680 kcal = 2,845.12 kJ
  • 690 kcal = 2,886.96 kJ
  • 700 kcal = 2,928.8 kJ
  • 710 kcal = 2,970.64 kJ
  • 720 kcal = 3,012.48 kJ
  • 730 kcal = 3,054.32 kJ
  • 740 kcal = 3,096.16 kJ
  • 750 kcal = 3,138 kJ
  • 760 kcal = 3,179.84 kJ
  • 770 kcal = 3,221.68 kJ
  • 780 kcal = 3,263.52 kJ
  • 790 kcal = 3,305.36 kJ
  • 800 kcal = 3,347.2 kJ
  • 810 kcal = 3,389.04 kJ
  • 820 kcal = 3,430.88 kJ
  • 830 kcal = 3,472.72 kJ
  • 840 kcal = 3,514.56 kJ
  • 850 kcal = 3,556.4 kJ
  • 860 kcal = 3,598.24 kJ
  • 870 kcal = 3,640.08 kJ
  • 880 kcal = 3,681.92 kJ
  • 890 kcal = 3,723.76 kJ
  • 900 kcal = 3,765.6 kJ
  • 910 kcal = 3,807.44 kJ
  • 920 kcal = 3,849.28 kJ
  • 930 kcal = 3,891.12 kJ
  • 940 kcal = 3,932.96 kJ
  • 950 kcal = 3,974.8 kJ
  • 960 kcal = 4,016.64 kJ
  • 970 kcal = 4,058.48 kJ
  • 980 kcal = 4,100.32 kJ
  • 990 kcal = 4,142.16 kJ
  • 1,000 kcal = 4,184 kJ
  • 1,025 kcal = 4,288.6 kJ
  • 1,050 kcal = 4,393.2 kJ
  • 1,075 kcal = 4,497.8 kJ
  • 1,100 kcal = 4,602.4 kJ
  • 1,125 kcal = 4,707 kJ
  • 1,150 kcal = 4,811.6 kJ
  • 1,175 kcal = 4,916.2 kJ
  • 1,200 kcal = 5,020.8 kJ
  • 1,225 kcal = 5,125.4 kJ
  • 1,250 kcal = 5,230 kJ
  • 1,275 kcal = 5,334.6 kJ
  • 1,300 kcal = 5,439.2 kJ
  • 1,325 kcal = 5,543.8 kJ
  • 1,350 kcal = 5,648.4 kJ
  • 1,375 kcal = 5,753 kJ
  • 1,400 kcal = 5,857.6 kJ
  • 1,425 kcal = 5,962.2 kJ
  • 1,450 kcal = 6,066.8 kJ
  • 1,475 kcal = 6,171.4 kJ
  • 1,500 kcal = 6,276 kJ
  • 1,525 kcal = 6,380.6 kJ
  • 1,550 kcal = 6,485.2 kJ
  • 1,575 kcal = 6,589.8 kJ
  • 1,600 kcal = 6,694.4 kJ
  • 1,625 kcal = 6,799 kJ
  • 1,650 kcal = 6,903.6 kJ
  • 1,675 kcal = 7,008.2 kJ
  • 1,700 kcal = 7,112.8 kJ
  • 1,725 kcal = 7,217.4 kJ
  • 1,750 kcal = 7,322 kJ
  • 1,775 kcal = 7,426.6 kJ
  • 1,800 kcal = 7,531.2 kJ
  • 1,825 kcal = 7,635.8 kJ
  • 1,850 kcal = 7,740.4 kJ
  • 1,875 kcal = 7,845 kJ
  • 1,900 kcal = 7,949.6 kJ
  • 1,925 kcal = 8,054.2 kJ
  • 1,950 kcal = 8,158.8 kJ
  • 1,975 kcal = 8,263.4 kJ
  • 2,000 kcal = 8,368 kJ
  • 2,050 kcal = 8,577.2 kJ
  • 2,100 kcal = 8,786.4 kJ
  • 2,150 kcal = 8,995.6 kJ
  • 2,200 kcal = 9,204.8 kJ
  • 2,250 kcal = 9,414 kJ
  • 2,300 kcal = 9,623.2 kJ
  • 2,350 kcal = 9,832.4 kJ
  • 2,400 kcal = 10,041.6 kJ
  • 2,450 kcal = 10,250.8 kJ
  • 2,500 kcal = 10,460 kJ
  • 2,550 kcal = 10,669.2 kJ
  • 2,600 kcal = 10,878.4 kJ
  • 2,650 kcal = 11,087.6 kJ
  • 2,700 kcal = 11,296.8 kJ
  • 2,750 kcal = 11,506 kJ
  • 2,800 kcal = 11,715.2 kJ
  • 2,850 kcal = 11,924.4 kJ
  • 2,900 kcal = 12,133.6 kJ
  • 2,950 kcal = 12,342.8 kJ
  • 3,000 kcal = 12,552 kJ
  • 3,050 kcal = 12,761.2 kJ
  • 3,100 kcal = 12,970.4 kJ
  • 3,150 kcal = 13,179.6 kJ
  • 3,200 kcal = 13,388.8 kJ
  • 3,250 kcal = 13,598 kJ
  • 3,300 kcal = 13,807.2 kJ
  • 3,350 kcal = 14,016.4 kJ
  • 3,400 kcal = 14,225.6 kJ
  • 3,450 kcal = 14,434.8 kJ
  • 3,500 kcal = 14,644 kJ
  • 3,550 kcal = 14,853.2 kJ
  • 3,600 kcal = 15,062.4 kJ
  • 3,650 kcal = 15,271.6 kJ
  • 3,700 kcal = 15,480.8 kJ
  • 3,750 kcal = 15,690 kJ
  • 3,800 kcal = 15,899.2 kJ
  • 3,850 kcal = 16,108.4 kJ
  • 3,900 kcal = 16,317.6 kJ
  • 3,950 kcal = 16,526.8 kJ
  • 4,000 kcal = 16,736 kJ
  • 4,050 kcal = 16,945.2 kJ
  • 4,100 kcal = 17,154.4 kJ
  • 4,150 kcal = 17,363.6 kJ
  • 4,200 kcal = 17,572.8 kJ
  • 4,250 kcal = 17,782 kJ
  • 4,300 kcal = 17,991.2 kJ
  • 4,350 kcal = 18,200.4 kJ
  • 4,400 kcal = 18,409.6 kJ
  • 4,450 kcal = 18,618.8 kJ
  • 4,500 kcal = 18,828 kJ
  • 4,550 kcal = 19,037.2 kJ
  • 4,600 kcal = 19,246.4 kJ
  • 4,650 kcal = 19,455.6 kJ
  • 4,700 kcal = 19,664.8 kJ
  • 4,750 kcal = 19,874 kJ
  • 4,800 kcal = 20,083.2 kJ
  • 4,850 kcal = 20,292.4 kJ
  • 4,900 kcal = 20,501.6 kJ
  • 4,950 kcal = 20,710.8 kJ
  • 5,000 kcal = 20,920 kJ
  • 5,100 kcal = 21,338.4 kJ
  • 5,200 kcal = 21,756.8 kJ
  • 5,300 kcal = 22,175.2 kJ
  • 5,400 kcal = 22,593.6 kJ
  • 5,500 kcal = 23,012 kJ
  • 5,600 kcal = 23,430.4 kJ
  • 5,700 kcal = 23,848.8 kJ
  • 5,800 kcal = 24,267.2 kJ
  • 5,900 kcal = 24,685.6 kJ
  • 6,000 kcal = 25,104 kJ
  • 6,100 kcal = 25,522.4 kJ
  • 6,200 kcal = 25,940.8 kJ
  • 6,300 kcal = 26,359.2 kJ
  • 6,400 kcal = 26,777.6 kJ
  • 6,500 kcal = 27,196 kJ
  • 6,600 kcal = 27,614.4 kJ
  • 6,700 kcal = 28,032.8 kJ
  • 6,800 kcal = 28,451.2 kJ
  • 6,900 kcal = 28,869.6 kJ
  • 7,000 kcal = 29,288 kJ
  • 7,100 kcal = 29,706.4 kJ
  • 7,200 kcal = 30,124.8 kJ
  • 7,300 kcal = 30,543.2 kJ
  • 7,400 kcal = 30,961.6 kJ
  • 7,500 kcal = 31,380 kJ
  • 7,600 kcal = 31,798.4 kJ
  • 7,700 kcal = 32,216.8 kJ
  • 7,800 kcal = 32,635.2 kJ
  • 7,900 kcal = 33,053.6 kJ
  • 8,000 kcal = 33,472 kJ
  • 8,100 kcal = 33,890.4 kJ
  • 8,200 kcal = 34,308.8 kJ
  • 8,300 kcal = 34,727.2 kJ
  • 8,400 kcal = 35,145.6 kJ
  • 8,500 kcal = 35,564 kJ
  • 8,600 kcal = 35,982.4 kJ
  • 8,700 kcal = 36,400.8 kJ
  • 8,800 kcal = 36,819.2 kJ
  • 8,900 kcal = 37,237.6 kJ
  • 9,000 kcal = 37,656 kJ
  • 9,100 kcal = 38,074.4 kJ
  • 9,200 kcal = 38,492.8 kJ
  • 9,300 kcal = 38,911.2 kJ
  • 9,400 kcal = 39,329.6 kJ
  • 9,500 kcal = 39,748 kJ
  • 9,600 kcal = 40,166.4 kJ
  • 9,700 kcal = 40,584.8 kJ
  • 9,800 kcal = 41,003.2 kJ
  • 9,900 kcal = 41,421.6 kJ
  • 10,000 kcal = 41,840 kJ

The thermochemical calorie is 4.184 joules by definition, and it is the one European nutrition labelling uses. Methodology & sources.

Frequently asked questions

How many different calories are there?

Three, and they differ by seven hundredths of a per cent. The thermochemical calorie is 4.184 joules by definition, and it is the one nutrition uses. The 15 °C calorie, measured on water warmed from 14.5 to 15.5 °C, is 4.1855 joules. The International Table calorie, used in thermal engineering, is 4.1868 joules. On a label the gap is invisible; in a steam table it is not.

Per 100 grams or per portion?

European regulation 1169/2011 requires the figure per 100 grams or 100 milliliters and makes the per-portion figure optional. The first lets you compare two products, the second sells. A pack claiming 150 kcal per 30 gram portion holds 500 kcal per 100 grams, that is 2092 kilojoules, and two packs with different portions only compare once brought back to 100 grams.

Why does Australia show kilojoules only?

Because its food standards code, shared with New Zealand, counts energy in kilojoules. A snack marked 1000 kJ holds 239 kilocalories, and a 600 milliliter soft drink about 1000 kJ. Habits follow the label: an Australian thinks in thousands of kilojoules where a European thinks in hundreds of kilocalories, and both mean the same thing.

How much energy does a body at rest use?

An adult at rest spends 1400 to 1800 kilocalories a day, that is 5.9 to 7.5 megajoules. Per second that comes to 70 to 85 watts: a sleeping human body draws about what an old filament bulb drew. That is what basal metabolism measures, before any activity at all.

How much is a gram of fat, sugar or alcohol?

The Atwater factors used by the European regulation are 37 kilojoules per gram of fat, 17 for carbohydrate and for protein, 29 for alcohol. In kilocalories that is 9, 4 and 7. That is why an oil reaches 900 kcal per 100 grams where pure sugar makes 400: for the same mass, fat carries more than twice the energy.

Related conversions

kJ to kcal Energy kcal to kWh kJ to J kilojoules to kilowatt-hours (kJ to kWh) kilowatt-hours to kilojoules (kWh to kJ) Kilowatt-hours to joules Kilowatt-hours to kilocalories Kilowatt-hours to watt-hours