Dose calculator · Ibuprofen

Ibuprofen dose calculator by weight

Every weight from 5 to 40 kg, in milligrams and in millilitres according to the strength of your bottle. Fixed table from the AEPap dosing guide — no AI. Always check the strength printed on your own bottle: it changes by country and by presentation.

Medicine (generic or brand)

Weight (kg)

Age

Or type what your bottle says (optional)

Ibuprofen 20 mg/ml, Ibuprofen 40 mg/ml or Ibuprofen 50 mg/ml: not the same thing

Ibuprofen comes in 3 strengths. The 50 mg/ml one has 2.5 times as much ibuprofen in each millilitre as the 20 mg/ml one: the same millilitres give 2.5 times the dose.

For a 10 kg child (100 mg):

Ibuprofen 20 mg/ml (syrup 2 % (100 mg/5 ml))5 ml
Ibuprofen 40 mg/ml (syrup 4 % (200 mg/5 ml))2.5 ml
Ibuprofen 50 mg/ml (drops 50 mg/ml)2 ml

⚠️ Before measuring, look at how many mg per ml the box says. It is the most common way to get a dose wrong at home.

Every 6–8 hours, and never more doses in 24 hours than the last column says.

Weight	Dose	syrup 2 % (100 mg/5 ml)	syrup 4 % (200 mg/5 ml)	drops 50 mg/ml	Max. / 24 h
5 kg	50 mg	2.5 ml	1.2 ml	1 ml	3
6 kg	60 mg	3 ml	1.5 ml	1.2 ml	3
7 kg	70 mg	3.5 ml	1.7 ml	1.4 ml	3
8 kg	80 mg	4 ml	2 ml	1.6 ml	3
9 kg	90 mg	4.5 ml	2.2 ml	1.8 ml	3
10 kg	100 mg	5 ml	2.5 ml	2 ml	3
11 kg	110 mg	5.5 ml	2.7 ml	2.2 ml	3
12 kg	120 mg	6 ml	3 ml	2.4 ml	3
13 kg	130 mg	6.5 ml	3.2 ml	2.6 ml	3
14 kg	140 mg	7 ml	3.5 ml	2.8 ml	3
15 kg	150 mg	7.5 ml	3.7 ml	3 ml	3
16 kg	160 mg	8 ml	4 ml	3.2 ml	3
17 kg	170 mg	8.5 ml	4.2 ml	3.4 ml	3
18 kg	180 mg	9 ml	4.5 ml	3.6 ml	3
19 kg	190 mg	9.5 ml	4.7 ml	3.8 ml	3
20 kg	200 mg	10 ml	5 ml	4 ml	3
21 kg	210 mg	10.5 ml	5.2 ml	4.2 ml	3
22 kg	220 mg	11 ml	5.5 ml	4.4 ml	3
23 kg	230 mg	11.5 ml	5.7 ml	4.6 ml	3
24 kg	240 mg	12 ml	6 ml	4.8 ml	3
25 kg	250 mg	12.5 ml	6.2 ml	5 ml	3
26 kg	260 mg	13 ml	6.5 ml	5.2 ml	3
27 kg	270 mg	13.5 ml	6.7 ml	5.4 ml	3
28 kg	280 mg	14 ml	7 ml	5.6 ml	3
29 kg	290 mg	14.5 ml	7.2 ml	5.8 ml	3
30 kg	300 mg	15 ml	7.5 ml	6 ml	3
31 kg	310 mg	15.5 ml	7.7 ml	6.2 ml	3
32 kg	320 mg	16 ml	8 ml	6.4 ml	3
33 kg	330 mg	16.5 ml	8.2 ml	6.6 ml	3
34 kg	340 mg	17 ml	8.5 ml	6.8 ml	3
35 kg	350 mg	17.5 ml	8.7 ml	7 ml	3
36 kg	360 mg	18 ml	9 ml	7.2 ml	3
37 kg	370 mg	18.5 ml	9.2 ml	7.4 ml	3
38 kg	380 mg	19 ml	9.5 ml	7.6 ml	3
39 kg	390 mg	19.5 ml	9.7 ml	7.8 ml	3
40 kg	400 mg	20 ml	10 ml	8 ml	3

⚠️ The grey rows are below the minimum weight for Ibuprofen: do not give it without medical advice. Under 3 months, no medicine without a prescription. Ibuprofen is also avoided if the child is dehydrated (vomiting, diarrhoea) or has chickenpox.

The guide publishes a band of 5–10 mg/kg per dose. This table uses 10 mg/kg: it is the dose the published daily maximum is built from, and the one the manufacturers' leaflets give. A lower dose within the band is also correct.

Not under 3 months or under 5 kg. Give with food. Avoid if dehydrated (vomiting/diarrhoea), with chickenpox, or with kidney problems.

AEPap — Guía rápida de dosificación práctica en pediatría (3.ª ed.), tabla analgésicos/antitérmicos.

What parents ask about Ibuprofen

How much Ibuprofen for a child of 10, 15 or 20 kg?

The dose goes by weight, never by age alone. For Ibuprofen:

10 kg 100 mgsyrup 2 % (100 mg/5 ml): 5 mlsyrup 4 % (200 mg/5 ml): 2.5 mldrops 50 mg/ml: 2 ml
15 kg 150 mgsyrup 2 % (100 mg/5 ml): 7.5 mlsyrup 4 % (200 mg/5 ml): 3.7 mldrops 50 mg/ml: 3 ml
20 kg 200 mgsyrup 2 % (100 mg/5 ml): 10 mlsyrup 4 % (200 mg/5 ml): 5 mldrops 50 mg/ml: 4 ml

How often, and how many times a day?

Every 6–8 hours. For a child of 15 kg that is at most 3 doses in 24 hours.

What if I don't know what the child weighs?

Age is not enough: two children of the same age can be several kilos apart, and this dose is calculated per kilo. Weigh the child, or ask at the pharmacy. PediBot will not give a figure from age alone.

From what age can Ibuprofen be given?

Not before 3 months, and not under 5 kg. Not under 3 months or under 5 kg. Give with food. Avoid if dehydrated (vomiting/diarrhoea), with chickenpox, or with kidney problems.

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