Pediatric Energy Requirement by Weight

Metabolism · Normal Values

Formula: 100-50-20 rule

Notes

100 kcal/kg/d for the first 10 kg
plus 50 kcal/kg/d for the second 10 kg (10–20 kg)
plus 20 kcal/kg/d for every kg after 20 kg

Metabolism: value for each weight
Weight	Age (estimate)	Value
2 kg	preterm	200 kilocalories per day
3 kg	newborn	300 kilocalories per day
4 kg	1 mo	400 kilocalories per day
5 kg	2 mo	500 kilocalories per day
6 kg	4 mo	600 kilocalories per day
7 kg	6 mo	700 kilocalories per day
8 kg	8 mo	800 kilocalories per day
9 kg	10 mo	900 kilocalories per day
10 kg	1 y	1000 kilocalories per day
11 kg	1 y 6 mo	1050 kilocalories per day
12 kg	2 y	1100 kilocalories per day
13 kg	2 y 4 mo	1150 kilocalories per day
14 kg	2 y 8 mo	1200 kilocalories per day
15 kg	3 y	1250 kilocalories per day
16 kg	3 y 6 mo	1300 kilocalories per day
17 kg	4 y	1350 kilocalories per day
18 kg	4 y 6 mo	1400 kilocalories per day
19 kg	5 y	1450 kilocalories per day
20 kg	5 y 6 mo	1500 kilocalories per day
21 kg	6 y	1520 kilocalories per day
22 kg	6 y 4 mo	1540 kilocalories per day
23 kg	6 y 8 mo	1560 kilocalories per day
24 kg	7 y	1580 kilocalories per day
25 kg	7 y 4 mo	1600 kilocalories per day
26 kg	7 y 8 mo	1620 kilocalories per day
27 kg	8 y	1640 kilocalories per day
28 kg	8 y 4 mo	1660 kilocalories per day
29 kg	8 y 8 mo	1680 kilocalories per day
30 kg	9 y	1700 kilocalories per day
31 kg	9 y 4 mo	1720 kilocalories per day
32 kg	9 y 8 mo	1740 kilocalories per day
33 kg	10 y	1760 kilocalories per day
34 kg	10 y 3 mo	1780 kilocalories per day
35 kg	10 y 6 mo	1800 kilocalories per day
36 kg	10 y 9 mo	1820 kilocalories per day
37 kg	11 y	1840 kilocalories per day
38 kg	11 y 4 mo	1860 kilocalories per day
39 kg	11 y 8 mo	1880 kilocalories per day
40 kg	12 y	1900 kilocalories per day

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Values imported unchanged on 2026-11-04. Independent verification against official sources is in progress (see Methodology).

Last updated: 2026-11-05