Human body weight

Human body weight is a person's mass or weight.
Strictly speaking, body weight is the measurement of mass without items located on the person. Practically though, body weight may be measured with clothes on, but without shoes or heavy accessories such as mobile phones and wallets, and using manual or digital weighing scales. Excess or reduced body weight is regarded as an indicator of determining a person's health, with body volume measurement providing an extra dimension by calculating the distribution of body weight.

Estimation in children

There are a number of methods to estimate weight in children for circumstances when actual weight cannot be measured. Most involve a parent or health care provider guessing the child's weight through weight-estimation formulas. These formulas base their findings on the child's age and tape-based systems of weight estimation. Of the many formulas that have been used for estimating body weight, some include the Advanced Pediatric Life Support formula, the Leffler formula, and Theron formula. There are also several types of tape-based systems for estimating children's weight, with the best-known being the Broselow tape. The Broselow tape is based on length with weight read from the appropriate color area. Newer systems, such as the PAWPER tape, make use of a simple two-step process to estimate weight: the length-based weight estimation is modified according to the child's body habitus to increase the accuracy of the final weight prediction.
The Leffler formula is used for children 0–10 years of age. In those less than a year old, it is
and for those 1–10 years old, it is
where m is the number of kilograms the child weighs and a_m and a_y respectively are the number of months or years old the child is.
The Theron formula is
where m and a_y are as above.

Fluctuation

Body weight varies in small amounts throughout the day, as the amount of water in the body is not constant. It changes due to activities such as drinking, urinating, or exercise. Professional sports participants may deliberately dehydrate themselves to enter a lower weight class, a practice known as weight cutting.

Ideal body weight

Ideal body weight was initially introduced by Ben J. Devine in 1974 to allow estimation of drug clearances in obese patients; researchers have since shown that the metabolism of certain drugs relates more to IBW than total body weight. The term was based on the use of insurance data that demonstrated the relative mortality for males and females according to different height-weight combinations.
The most common estimation of IBW is by the [|Devine formula]; other models exist and have been noted to give similar results. Other methods used in estimating the ideal body weight are body mass index and the Hamwi method. The IBW is not the perfect fat measurement, as it does not show the fat or muscle percentage in one's body. For example, athletes' results may show that they are overweight when they are actually very fit and healthy. Machines like the dual-energy X-ray absorptiometry can accurately measure the percentage and weight of fat, muscle, and bone in a body.

Devine formula

The Devine formula for calculating ideal body weight in adults is as follows:

Male ideal body weight = + ×
Female ideal body weight = + ×
Hamwi method

The Hamwi method is used to calculate the ideal body weight of the general adult:

Male ideal body weight = + ×
Female ideal body weight = + ×
Usage

Sports

Many disciplines in weightlifting or combat sports separate competitors into weight classes.

Medicine

Ideal body weight, specifically the Devine formula, is used clinically for multiple reasons, most commonly in estimating renal function in drug dosing, and predicting pharmacokinetics in morbidly obese patients.

Average weight around the world

By region

Data from 2005:

Region	Adult population	Average weight	% Overweight
Africa	535		28.9%
Asia	2,815		24.2%
Europe	606		55.6%
Latin America and the Caribbean	386		57.9%
North America	263		73.9%
Oceania	24		63.3%
World	4,630		34.7%

By country

Country	Average male weight	Average female weight	Sample population / age range		Year
			18–69	Measured	2018
			25–64	Measured	2005
			18–69	Measured	2016
			18+	Measured	2018
			16+	Measured	2005
			25+	Measured	2009–2010
			18+	Measured	2008
			20+	Measured	2010
			18–69	Measured	2015
			18–69	Measured	2014
			15–69	Measured	2014
			20–74	Measured	2008–2009
			19+	Measured	2010–2011
			21–59	Self-reported	2021
			25–64	Measured	2013
			25–64	Measured	2010
			15+	Measured	2003
			18–79	Measured	2007–2009
			15+	Measured	2009–2010
- San José			20+	Measured	2010
			25–64	Measured	2016–2017
			18+	Measured	2003–2010
			15+	Measured	2005
			18–69	Measured	2016
			18+	Self-reported	2021
			16+	Measured	2020
			18+	Self-reported	2020
			18+	Measured	2017
			18–69	Measured	2013–2014
			15–64	Measured	2007–2008
			18–64	Measured	2012
			19+	Measured	2018
			15–64	Measured	2012–2013
			25–64	Measured	2007–2008
			25–64	Measured	2005
			20+	Measured	2013
			25–64	Measured	2009
			25–64	Measured	2006
			18+	Measured	2019
			18–64	Measured	2013
			18–69	Measured	2014–2015
			18–69	Measured	2016
			16–84	Measured	2003–2004
			15–64	Measured	2010
			25–64	Measured	2012
			15–64	Measured	2011
			15+	Measured	2017
			18–69	Measured	2018
– England			16+	Measured	2019
– Wales			16+	Measured	2009
			18+	Measured	2020
			20+	Measured	2015–2018

Global statistics

Researchers at the London School of Hygiene and Tropical Medicine published a study of average weights of adult humans in the journal BMC Public Health and at the United Nations conference Rio+20.

Rank	Country	Kilograms	Pounds	Relative size
1	Micronesia	87.398		-
2	Tonga	87.344		-
3	United States	81.928		-
4	Samoa	78.544		-
5	Kuwait	77.791		-
6	Australia	77.356		-
7	Malta	76.956		-
8	Qatar	76.866		-
9	Croatia	76.412		-
10	United Kingdom	75.795		-
11	UAE	75.532		-
12	Greece	75.038		-
13	Cyprus	74.802		-
14	Egypt	74.271		-
15	Barbados	73.831		-
16	Belarus	73.663		-
17	Bahrain	73.550		-
18	Germany	73.042		-
19	Solomon Islands	72.797		-
20	Austria	72.743		-
21	Saudi Arabia	72.638		-
22	Iceland	72.584		-
23	Trinidad & Tobago	72.538		-
24	Argentina	72.434		-
25	Bahamas	72.380		-
26	Finland	72.348		-
27	Israel	71.912		-
28	Czech Rep.	71.640		-
29	New Zealand	71.631		-
30	Bulgaria	71.459		-
31	Russia	71.418		-
32	Slovenia	71.200		-
33	Slovakia	71.060		-
34	Albania	71.019		-
35	Bosnia	71.001		-
36	Switzerland	70.987		-
37	Rep. of Moldova	70.978		-
38	Venezuela	70.788		-
39	Chile	70.593		-
40	Georgia	70.561		-
41	Spain	70.556		-
42	Azerbaijan	70.484		-
43	Hungary	70.443		-
44	Libya	70.429		-
45	Luxembourg	70.270		-
46	Tajikistan	70.234		-
47	Portugal	70.193		-
48	Lithuania	70.153		-
49	Grenada	70.139		-
50	Panama	69.939		-
51	Ireland	69.926		-
52	Canada	69.767		-
53	Jordan	69.649		-
54	St Vincent & Grenadines	69.590		-
55	Belize	69.377		-
56	Poland	69.241		-
57	Macedonia	69.209		-
58	Italy	69.205		-
59	Jamaica	69.064		-
60	Sweden	69.064		-
61	Turkey	69.046		-
62	Cuba	69.037		-
63	Mexico	69.023		-
64	Mongolia	68.910		-
65	Uruguay	68.873		-
66	Belgium	68.801		-
67	Suriname	68.778		-
68	Latvia	68.778		-
69	Norway	68.774		-
70	Netherlands	68.746		-
71	Ukraine	68.674		-
72	Guatemala	68.579		-
73	Saint Lucia	68.438		-
74	Armenia	68.424		-
75	Nicaragua	68.415		-
76	Vanuatu	68.229		-
77	El Salvador	68.220		-
78	Lebanon	68.170		-
79	Ecuador	68.166		-
80	Fiji	68.048		-
81	Bolivia	68.034		-
82	Dominican Rep.	67.993		-
83	Denmark	67.957		-
84	Costa Rica	67.853		-
85	Tunisia	67.726		-
86	Iran	67.608		-
87	Turkmenistan	67.563		-
88	Paraguay	67.445		-
89	Peru	67.440		-
90	Syria	67.422		-
91	Guyana	67.032		-
92	France	66.782		-
93	Estonia	66.732		-
94	Equatorial Guinea	66.451		-
95	Romania	66.401		-
96	Colombia	66.370		-
97	Uzbekistan	66.351		-
98	Kazakhstan	66.265		-
99	Brazil	66.093		-
100	Mauritius	66.052		-
101	Iraq	66.034		-
102	Lesotho	65.966		-
103	Honduras	65.834		-
104	Oman	65.803		-
105	South Africa	65.667		-
106	Kyrgyzstan	65.413		-
107	Botswana	65.045		-
108	Cameroon	64.832		-
109	Morocco	64.764		-
110	South Korea	64.392		-
111	Mauritania	64.179		-
112	Algeria	63.639		-
113	Gabon	62.845		-
114	Ghana	62.491		-
115	Cape Verde	62.296		-
116	Papua New Guinea	62.251		-
117	Eswatini	62.097		-
118	Djibouti	62.015		-
119	Haiti	61.698		-
120	Comoros	61.044		-
121	Zimbabwe	61.022		-
122	Brunei	60.945		-
123	Sierra Leone	60.854		-
124	Nigeria	60.745		-
125	Malaysia	60.682		-
126	China	60.555		-
127	Angola	60.387		-
128	Senegal	60.373		-
129	Benin	60.282		-
130	Mali	60.078		-
131	Yemen	59.802		-
132	Philippines	59.715		-
133	Namibia	59.584		-
134	Sudan	59.407		-
135	Togo	59.280		-
136	Guinea	59.112		-
137	Japan	59.017		-
138	Pakistan	58.976		-
139	Singapore	58.935		-
140	Thailand	58.786		-
141	Côte d'Ivoire	58.727		-
142	Laos	58.436		-
143	Chad	58.196		-
144	Niger	57.933		-
145	Maldives	57.647		-
146	São Tomé and Príncipe	57.561		-
147	Burkina Faso	57.456		-
148	Congo	57.384		-
149	Tanzania	57.293		-
150	Gambia	57.071		-
151	Uganda	57.007		-
152	Afghanistan	56.935		-
153	Malawi	56.681		-
154	Rwanda	56.635		-
155	Myanmar	56.354		-
156	Kenya	56.264		-
157	Guinea-Bissau	56.087		-
158	Mozambique	55.955		-
159	Central African Rep.	55.946		-
160	Zambia	55.910		-
161	Cambodia	55.742		-
162	Liberia	55.533		-
163	Somalia	55.375		-
164	Madagascar	55.157		-
165	Burundi	54.127		-
166	Congo	53.501		-
167	Ethiopia	53.057		-
168	India	52.943		-
169	North Korea	52.589		-
170	Indonesia	52.467		-
171	Eritrea	52.041		-
172	Timor-Leste	51.950		-
173	Bhutan	51.142		-
174	Vietnam	50.725		-
175	Nepal	50.476		-
176	Sri Lanka	50.421		-
177	Bangladesh	49.591		-
—	world average	61.997	'''	-