21焦等于多少千卡？焦（或称“焦”，单位符号是：J）和千卡（或称“千卡”，单位符号是：kcal）是能量单位，它们之间的换算关系是：1焦等于0.000239千卡。要将21焦转换为千卡，我们可以通过焦与千卡换算比率来计算：
21 焦 = 21 * 0.000239 千卡 = 0.005017 千卡
因此，21焦换算成千卡的答案是21焦等于0.005017千卡。
了解更多：21千卡等于多少焦？ | 1焦等于多少千卡？ | 1千卡等于多少焦？
| 焦 (J) | 千卡 (kcal) |
|---|---|
| 21.1 J | 0.005041 kcal |
| 21.2 J | 0.005065 kcal |
| 21.3 J | 0.005089 kcal |
| 21.4 J | 0.005112 kcal |
| 21.5 J | 0.005136 kcal |
| 21.6 J | 0.00516 kcal |
| 21.7 J | 0.005184 kcal |
| 21.8 J | 0.005208 kcal |
| 21.9 J | 0.005232 kcal |
| 22 J | 0.005256 kcal |
| 22.1 J | 0.00528 kcal |
| 22.2 J | 0.005304 kcal |
| 22.3 J | 0.005327 kcal |
| 22.4 J | 0.005351 kcal |
| 22.5 J | 0.005375 kcal |
| 22.6 J | 0.005399 kcal |
| 22.7 J | 0.005423 kcal |
| 22.8 J | 0.005447 kcal |
| 22.9 J | 0.005471 kcal |
| 23 J | 0.005495 kcal |
| 23.1 J | 0.005519 kcal |
| 23.2 J | 0.005542 kcal |
| 23.3 J | 0.005566 kcal |
| 23.4 J | 0.00559 kcal |
| 23.5 J | 0.005614 kcal |
| 23.6 J | 0.005638 kcal |
| 23.7 J | 0.005662 kcal |
| 23.8 J | 0.005686 kcal |
| 23.9 J | 0.00571 kcal |
| 24 J | 0.005734 kcal |
| 焦 (J) | 千卡 (kcal) |
|---|---|
| 24.1 J | 0.005757 kcal |
| 24.2 J | 0.005781 kcal |
| 24.3 J | 0.005805 kcal |
| 24.4 J | 0.005829 kcal |
| 24.5 J | 0.005853 kcal |
| 24.6 J | 0.005877 kcal |
| 24.7 J | 0.005901 kcal |
| 24.8 J | 0.005925 kcal |
| 24.9 J | 0.005949 kcal |
| 25 J | 0.005972 kcal |
| 25.1 J | 0.005996 kcal |
| 25.2 J | 0.00602 kcal |
| 25.3 J | 0.006044 kcal |
| 25.4 J | 0.006068 kcal |
| 25.5 J | 0.006092 kcal |
| 25.6 J | 0.006116 kcal |
| 25.7 J | 0.00614 kcal |
| 25.8 J | 0.006164 kcal |
| 25.9 J | 0.006188 kcal |
| 26 J | 0.006211 kcal |
| 26.1 J | 0.006235 kcal |
| 26.2 J | 0.006259 kcal |
| 26.3 J | 0.006283 kcal |
| 26.4 J | 0.006307 kcal |
| 26.5 J | 0.006331 kcal |
| 26.6 J | 0.006355 kcal |
| 26.7 J | 0.006379 kcal |
| 26.8 J | 0.006403 kcal |
| 26.9 J | 0.006426 kcal |
| 27 J | 0.00645 kcal |