Country or area · Eastern Africa · Africa · UN WPP 2024

Burundi population

Burundi population now

14,812,440

A projection read at this second, not a count: the UN's totals for 1 January 2026 and 2027, joined by a straight line. 95% range for 31 December 2026: 13.8–16.1 million.

Mid-2023, UN estimate: 13,689,449

Year: 2026; projection · medium
Population, mid-2026: 14.7292 million; 95% range, 31 Dec: 13.8–16.1 million
Median age: 17.6
Aged 65+: 2.6%

Move through time, 1950–2100

2023 | 2024

male female projection · one cell = 5,000 people

How to read this: one row for each age, newborns at the bottom; men on the left, women on the right.

Verified 2026-09-30 · 73 canaries

BDI · 1950–2100 · in brief

Burundi in numbers

13,689,449 people lived in Burundi in mid-2023: 0.17% of the world's people, and the 78th-largest population of the 236 countries and areas the UN reports. That is 6.1 times its 1950 population of 2.3 million.

In the UN's medium projection it is still growing in 2100, when it reaches 37.9 million. The projection is uncertain: on 1 January 2100 the UN's 95% range runs from 16.7 million to 102 million.

Births outnumber deaths in every year from 1950 to 2100, estimates and projection alike.

The median age was 19.3 in 1950 and 16.9 in 2023; the projection has 35.0 in 2100. 2.5% of people were 65 or older in 2023, against 13.1% projected for 2100. The working-age population (15–64) is still growing in 2100 in the medium projection.

Its place in the world by population: 78th in 2023, 70th in 2050, 58th in 2100. In the medium projection it overtakes Rwanda in 2030, Romania in 2035 and the Netherlands in 2038.

Population, mid-2023: 13,689,449
Rank by population, 2023: 78 of 236
Share of the world, 2023: 0.17%
Change in a year, mid-2022 to mid-2023: +2.77% · +368,351 people
People per km² of land, 2023: 533
Land area, 2023: 25,680 km²
Births, 2023: 460,882
Deaths, 2023: 91,963
Net migration, 2023: +1,995
Children per woman, 2023: 4.88
Median age, 2023: 16.9 years
Life expectancy at birth, 2023: 63.6 years
In a city, 2025: 16 of every 100
Population, mid-1950: 2,254,938
Projected, mid-2050: 24,131,720
Projected, mid-2100: 37,873,962

BDI · 1950–2100 · total population

Population, 1950–2100

estimates | projections020 m40 m60 m80 m100 m120 m1950197520002025205020752100

estimate projection, up to the bottom of the 95% range 95% range medium projection. One column is one year's population, read on 1 January; the paper rules divide it into equal cells.

Show the numbers: Burundi, 1950–2100

Burundi: population on 1 January, births, deaths, fertility and life expectancy, 1950–2100
Year	Kind	Population, 1 Jan	95% range	Births	Deaths	Children per woman	Life expectancy
1950	estimate	2,229,322		117,211	52,660	6.92	40.9
1951	estimate	2,280,554		118,043	54,448	6.91	41.2
1952	estimate	2,330,938		118,830	55,409	6.90	41.5
1953	estimate	2,380,670		120,089	56,128	6.92	41.7
1954	estimate	2,429,703		121,062	56,731	6.92	42.0
1955	estimate	2,479,470		122,309	57,307	6.93	42.2
1956	estimate	2,529,829		123,395	57,742	6.93	42.4
1957	estimate	2,580,787		124,544	58,143	6.93	42.6
1958	estimate	2,632,179		126,042	58,565	6.95	42.9
1959	estimate	2,682,644		127,728	59,035	6.98	43.1
1960	estimate	2,736,551		129,619	59,586	7.00	43.3
1961	estimate	2,791,964		131,590	60,374	7.02	43.4
1962	estimate	2,878,273		136,528	61,817	7.04	43.5
1963	estimate	2,937,612		138,863	62,901	7.07	43.6
1964	estimate	3,002,071		141,629	64,102	7.09	43.6
1965	estimate	3,109,229		148,729	70,520	7.11	41.8
1966	estimate	3,173,504		151,709	68,059	7.13	43.5
1967	estimate	3,262,416		156,887	70,516	7.16	43.3
1968	estimate	3,338,964		160,921	72,156	7.18	43.4
1969	estimate	3,421,810		165,892	75,041	7.21	43.0
1970	estimate	3,487,370		168,521	76,047	7.21	43.2
1971	estimate	3,573,495		173,238	78,087	7.21	43.2
1972	estimate	3,661,084		176,528	145,994	7.21	25.8
1973	estimate	3,573,171		168,491	93,687	7.21	37.4
1974	estimate	3,650,811		174,302	78,815	7.22	43.3
1975	estimate	3,756,370		181,986	80,815	7.24	43.5
1976	estimate	3,836,854		186,274	81,878	7.25	43.7
1977	estimate	3,928,398		191,451	82,962	7.25	44.0
1978	estimate	4,038,767		198,859	83,977	7.26	44.4
1979	estimate	4,161,909		208,120	84,742	7.31	45.0
1980	estimate	4,245,151		212,072	84,326	7.35	45.7
1981	estimate	4,522,260		233,906	87,677	7.33	46.4
1982	estimate	4,609,768		234,484	87,399	7.31	47.0
1983	estimate	4,753,012		240,972	88,174	7.30	47.4
1984	estimate	4,864,043		243,073	88,706	7.29	47.7
1985	estimate	4,988,887		247,150	90,258	7.29	47.7
1986	estimate	5,079,198		248,139	91,972	7.32	47.4
1987	estimate	5,179,631		251,669	94,189	7.38	47.1
1988	estimate	5,315,942		256,756	111,523	7.38	42.9
1989	estimate	5,414,711		259,467	101,922	7.39	45.8
1990	estimate	5,528,701		262,095	105,476	7.37	45.2
1991	estimate	5,645,404		265,120	108,970	7.34	44.7
1992	estimate	5,762,310		267,650	111,228	7.30	44.5
1993	estimate	5,954,503		277,647	148,748	7.27	37.2
1994	estimate	5,399,183		214,046	101,080	7.23	44.5
1995	estimate	6,028,524		272,773	112,486	7.18	44.6
1996	estimate	6,104,108		271,695	112,778	7.12	44.8
1997	estimate	6,036,903		256,381	105,976	7.04	45.7
1998	estimate	6,103,181		256,079	102,067	6.96	46.7
1999	estimate	6,271,035		267,499	100,800	6.90	47.6
2000	estimate	6,403,276		276,449	102,581	6.87	47.6
2001	estimate	6,537,111		285,509	100,970	6.85	48.5
2002	estimate	6,731,619		300,548	98,657	6.82	49.9
2003	estimate	6,916,646		313,617	97,323	6.79	51.0
2004	estimate	7,169,663		331,100	96,205	6.75	52.2
2005	estimate	7,451,649		350,183	96,785	6.71	53.0
2006	estimate	7,722,949		366,335	96,462	6.66	54.0
2007	estimate	8,008,144		381,375	96,047	6.59	54.8
2008	estimate	8,315,604		396,840	96,090	6.51	55.6
2009	estimate	8,695,670		415,969	96,380	6.41	56.4
2010	estimate	9,199,621		440,345	98,540	6.26	57.1
2011	estimate	9,553,268		446,809	97,876	6.11	57.8
2012	estimate	9,882,688		450,756	96,688	5.99	58.5
2013	estimate	10,259,367		458,280	96,054	5.89	59.2
2014	estimate	10,619,314		463,323	95,523	5.79	59.8
2015	estimate	10,980,257		466,834	95,986	5.70	60.1
2016	estimate	11,114,903		450,656	92,266	5.59	60.8
2017	estimate	11,363,999		444,372	90,489	5.48	61.4
2018	estimate	11,649,525		441,348	89,646	5.38	61.8
2019	estimate	12,069,367		448,292	90,619	5.27	62.2
2020	estimate	12,441,306		452,381	90,725	5.18	62.6
2021	estimate	12,792,766		454,572	94,725	5.08	62.1
2022	estimate	13,138,197		456,995	93,204	4.98	62.9
2023	estimate	13,503,998		460,882	91,963	4.88	63.6
2024	estimate	13,874,901		466,545	93,704	4.79	63.8
2025	projection	14,220,671	13.6–14.8 million	468,720	95,320	4.67	64.0
2026	projection	14,559,334	13.7–15.4 million	471,624	96,877	4.57	64.1
2027	projection	14,898,980	13.8–16.1 million	475,895	98,560	4.46	64.3
2028	projection	15,254,978	13.9–16.7 million	483,052	100,485	4.37	64.5
2029	projection	15,633,051	14.0–17.3 million	491,466	102,594	4.28	64.6
2030	projection	15,998,660	14.2–18.0 million	500,614	104,674	4.20	64.8
2031	projection	16,365,373	14.3–18.6 million	509,473	106,765	4.11	64.9
2032	projection	16,744,687	14.4–19.3 million	518,797	108,954	4.03	65.1
2033	projection	17,125,789	14.7–20.1 million	528,492	111,157	3.96	65.2
2034	projection	17,509,479	14.8–20.6 million	532,619	113,334	3.85	65.3
2035	projection	17,892,137	14.9–21.3 million	541,535	115,540	3.78	65.5
2036	projection	18,279,545	15.1–22.2 million	545,733	117,736	3.69	65.6
2037	projection	18,686,565	15.1–23.0 million	552,393	120,040	3.62	65.8
2038	projection	19,099,952	15.2–23.8 million	559,216	122,498	3.55	65.9
2039	projection	19,511,114	15.5–24.6 million	564,944	124,908	3.49	66.1
2040	projection	19,925,929	15.6–25.5 million	569,942	127,455	3.43	66.2
2041	projection	20,336,706	15.7–26.3 million	574,363	130,002	3.37	66.4
2042	projection	20,738,406	15.9–27.3 million	577,376	132,482	3.32	66.5
2043	projection	21,164,719	16.1–28.1 million	580,343	135,217	3.27	66.7
2044	projection	21,576,978	16.3–29.0 million	582,167	138,055	3.22	66.8
2045	projection	21,994,406	16.4–29.8 million	583,556	140,982	3.17	66.9
2046	projection	22,401,368	16.6–30.4 million	583,357	143,921	3.13	67.0
2047	projection	22,771,047	16.7–31.3 million	581,658	146,745	3.08	67.2
2048	projection	23,169,082	16.9–32.1 million	580,500	149,884	3.04	67.3
2049	projection	23,547,911	16.9–33.0 million	578,564	153,019	3.00	67.4
2050	projection	23,949,994	17.1–34.0 million	578,377	156,337	2.96	67.5
2051	projection	24,313,446	17.1–34.8 million	576,441	159,541	2.92	67.7
2052	projection	24,683,600	17.2–35.7 million	576,488	163,080	2.89	67.8
2053	projection	25,058,700	17.2–36.7 million	576,606	166,789	2.86	67.9
2054	projection	25,432,395	17.3–37.8 million	576,396	170,385	2.82	68.1
2055	projection	25,807,375	17.3–38.6 million	577,243	174,264	2.79	68.2
2056	projection	26,162,475	17.3–39.2 million	576,507	178,067	2.76	68.3
2057	projection	26,524,284	17.4–40.4 million	577,053	181,902	2.73	68.5
2058	projection	26,867,628	17.6–41.2 million	577,518	185,877	2.70	68.6
2059	projection	27,209,561	17.5–42.3 million	578,684	190,000	2.67	68.7
2060	projection	27,558,862	17.5–43.3 million	580,419	194,141	2.64	68.8
2061	projection	27,903,070	17.5–44.2 million	582,727	198,132	2.62	69.0
2062	projection	28,249,058	17.6–45.4 million	585,000	202,393	2.60	69.1
2063	projection	28,593,078	17.6–46.4 million	587,183	206,544	2.57	69.2
2064	projection	28,925,345	17.5–47.6 million	589,161	210,621	2.55	69.3
2065	projection	29,265,021	17.4–49.2 million	591,147	214,839	2.53	69.4
2066	projection	29,634,099	17.5–50.7 million	593,625	218,961	2.50	69.5
2067	projection	29,981,124	17.3–51.8 million	595,181	223,134	2.48	69.7
2068	projection	30,336,516	17.7–53.3 million	596,593	227,508	2.46	69.8
2069	projection	30,675,065	17.9–54.1 million	598,301	231,643	2.45	69.9
2070	projection	31,011,329	17.8–55.2 million	598,992	235,795	2.43	70.0
2071	projection	31,354,580	17.9–56.5 million	599,143	239,824	2.41	70.1
2072	projection	31,658,223	17.9–58.2 million	598,228	243,803	2.39	70.2
2073	projection	31,978,528	17.9–59.3 million	598,008	247,969	2.38	70.4
2074	projection	32,298,588	17.9–60.1 million	596,670	252,370	2.36	70.5
2075	projection	32,602,640	17.8–61.8 million	595,908	256,829	2.35	70.6
2076	projection	32,918,107	17.7–63.1 million	594,306	261,489	2.33	70.7
2077	projection	33,200,434	17.8–64.0 million	592,016	266,151	2.31	70.8
2078	projection	33,508,651	17.7–66.0 million	590,234	271,277	2.30	70.9
2079	projection	33,792,081	17.6–67.1 million	587,837	276,199	2.29	71.0
2080	projection	34,066,499	17.5–68.4 million	585,357	281,435	2.27	71.2
2081	projection	34,308,613	17.5–70.4 million	581,844	286,583	2.26	71.3
2082	projection	34,578,588	17.4–71.6 million	580,908	292,284	2.25	71.4
2083	projection	34,829,553	17.5–71.9 million	578,813	297,967	2.24	71.5
2084	projection	35,048,248	17.3–74.2 million	575,835	303,502	2.22	71.7
2085	projection	35,274,108	17.1–75.5 million	573,625	309,214	2.21	71.8
2086	projection	35,512,178	17.0–77.2 million	571,362	315,173	2.20	71.9
2087	projection	35,719,532	17.0–78.6 million	569,484	321,072	2.19	72.0
2088	projection	35,907,590	17.0–80.2 million	566,834	327,202	2.17	72.1
2089	projection	36,113,997	17.1–81.9 million	564,587	332,919	2.16	72.3
2090	projection	36,318,544	17.0–83.8 million	563,472	338,315	2.15	72.4
2091	projection	36,488,205	17.0–86.4 million	561,455	344,081	2.14	72.5
2092	projection	36,651,817	17.0–87.1 million	559,862	349,376	2.13	72.6
2093	projection	36,815,403	16.9–89.9 million	559,121	354,348	2.12	72.7
2094	projection	36,976,139	16.9–91.7 million	557,450	359,357	2.11	72.8
2095	projection	37,151,621	16.9–93.1 million	556,493	363,690	2.10	73.0
2096	projection	37,291,784	16.8–94.3 million	555,498	368,037	2.09	73.1
2097	projection	37,427,327	16.9–96.5 million	554,580	372,048	2.08	73.2
2098	projection	37,564,068	17.0–98.3 million	553,558	375,901	2.08	73.3
2099	projection	37,704,550	17.0–100.3 million	552,371	379,327	2.07	73.5
2100	projection	37,822,574	16.7–101.7 million	550,613	382,732	2.06	73.6

Show the numbers: Burundi, mid-2026, by single year of age

Burundi: population by single year of age, mid-2026
Age	Male	Female
0	229,890	225,714
1	226,529	222,738
2	223,666	219,996
3	220,485	216,913
4	217,840	214,504
5	215,459	212,394
6	212,779	209,918
7	209,246	206,634
8	207,068	204,621
9	207,292	205,016
10	209,952	207,896
11	210,862	209,067
12	207,836	206,335
13	203,937	202,685
14	200,097	199,068
15	196,291	195,494
16	188,560	187,972
17	178,038	177,688
18	168,656	168,534
19	159,859	159,957
20	150,935	151,300
21	141,424	142,021
22	131,886	132,612
23	123,481	124,259
24	115,547	116,363
25	108,351	109,224
26	102,273	103,206
27	96,111	97,086
28	91,770	92,806
29	91,904	93,052
30	92,532	93,784
31	82,443	83,649
32	81,914	83,322
33	88,934	90,582
34	86,610	88,372
35	85,512	87,534
36	84,471	86,657
37	83,338	85,704
38	81,744	84,192
39	79,936	82,479
40	78,477	81,210
41	76,735	79,606
42	74,607	77,586
43	71,929	74,955
44	69,182	72,228
45	64,374	67,338
46	58,982	61,811
47	54,986	57,700
48	50,586	53,130
49	46,739	49,125
50	43,326	45,590
51	39,760	41,908
52	36,166	38,204
53	34,191	36,242
54	32,644	34,764
55	30,185	32,334
56	28,056	30,248
57	26,133	28,331
58	24,268	26,448
59	22,578	24,752
60	21,116	23,316
61	19,644	21,865
62	18,351	20,603
63	17,526	19,864
64	16,574	18,967
65	15,658	18,096
66	14,936	17,443
67	14,189	16,750
68	13,422	16,017
69	12,651	15,262
70	11,870	14,480
71	11,052	13,641
72	10,224	12,785
73	9,392	11,919
74	8,580	11,066
75	7,810	10,247
76	6,082	8,286
77	4,726	6,732
78	4,308	6,258
79	3,733	5,556
80	3,240	4,924
81	2,762	4,285
82	2,316	3,666
83	1,910	3,085
84	1,553	2,559
85	1,246	2,096
86	983	1,694
87	760	1,346
88	570	1,045
89	412	792
90	288	586
91	195	426
92	129	302
93	82	210
94	50	140
95	30	91
96	17	57
97	10	35
98	5	20
99	2	12
100+	1	12

BDI · 1950–2100 · every age, every year

Burundi, every age in every year

Each column is a year and each row an age; the denser the ink in a cell, the more people. Everyone born in the same year climbs one 45° diagonal, so famines, baby booms and migration show up as streaks. Select a cell to follow its generation.

BDI · ages 15–64

Who does the work in Burundi

In Burundi the number of people aged 15–64 is still growing in 2100, the last year the UN projects. In 2023 there were 7,135,620 of them.

100 aged 15–64

87 children

5 aged 65+

aged 15–64 children under 15 aged 65 and over

How to read this: the orange squares are 100 people aged 15–64 in 2023, and the rows below are how many children (teal) and how many people aged 65 or older (violet) lived alongside them.

At no point between 1950 and 2100 do fewer than 50 dependants live alongside every 100 people aged 15–64 here.

fewer than 50 dependants per 100 the same, projected 50 or more

How to read this: the strip runs 1950 to 2100. Coloured years are the ones with under 50 dependants for every 100 people aged 15–64; grey years are the rest, and a hatched year has not happened yet.

How every country compares

BDI · arrivals minus departures

Who arrives in Burundi, and who leaves

In 2020–2025 Burundi loses 11,993 people a year: everyone who arrives, minus everyone who leaves. The age at which that happens most is 20–24, at 2,354 a year more leaving than arriving.

one square = 500 people a year

020406080+

more arrive than leave more leave than arrive

How to read this: left to right is age, from babies to 100. Blue squares above the line are ages at which more people arrive than leave; orange squares below it, ages at which more leave than arrive. These are the UN's projection for 2020–2025. There is no record of migration by age before 2020.

Its best and worst years between 1950 and 2023: a gain of 516,373 (1994), and a loss of 684,261 (1993).

In 2024, 387,101 people living in Burundi had been born in another country, 3 of every 100 people there, against 6 in 1990.

How migration works everywhere

BDI · births by the mother's age · 1950–2100

Who has the babies in Burundi

Of every 100 babies born in Burundi in 2023, 9 had a mother under 20, 70 a mother aged 20 to 34 and 21 a mother aged 35 or older. In 1950 it was 10 under 20 and 23 aged 35 or older.

1950
10 · 67 · 23

2023
9 · 70 · 21

2050 · projected
6 · 75 · 19

The mother's age: under 20 20 to 34 35 or older projected

How to read this: each block is 100 babies born in that year, one square each, coloured by how old the mother was. The numbers under a block are the three groups, youngest mothers first.

Babies born, 2023: 460,882
Average age when women have a baby: 30.2 years; 30.7 in 1950
Babies a year per 1,000 girls aged 15–19: 53; 99 in 1950

Babies by the mother's age, 1950–2100

Babies born in Burundi by the mother's age
Mother's age	1950	1975	2000	2023	2050 projected	2100 projected
10–14	428	649	1,311	528	141	42
15–19	11,602	18,398	33,906	40,866	36,383	19,776
20–24	27,162	48,867	74,145	113,702	132,785	96,401
25–29	27,768	42,521	64,851	108,257	155,180	161,307
30–34	23,572	34,220	48,239	100,849	142,657	167,198
35–39	16,316	23,102	32,110	65,530	81,056	80,960
40–44	8,510	11,725	17,500	27,231	27,462	23,027
45–49	1,769	2,385	4,200	3,774	2,632	1,858
50–54	84	119	187	145	81	44
All babies	117,211	181,986	276,449	460,882	578,377	550,613

The UN's births for each year, split by the mother's age in the UN's own proportions.

BDI · healthy years · 2021

Years in good health in Burundi

In Burundi, WHO puts the healthy years a newborn could expect in 2021 at 55.8 (95% range 55.0–56.9), out of 64.0 in all. The years in less than full health come to 8.2, below the world's 9.5: shorter lives leave fewer years in which to be ill.

Women

56.9 in full health, 9.1 not: 66.0 years

Men

54.8 in full health, 7.2 not: 62.0 years

a year in full health a year in less than full health

How to read this: each square is a year of life, each row ten years; filled squares are years in full health, rounded to whole years.

Women: 56.9 healthy years of 66.0. Men: 54.8 of 62.0.

BDI · forced from home · end of 2025

Displacement in Burundi

At the end of 2025, Burundi was hosting 112,266 people who had crossed a border into it, about 8 of every 1,000 people living there.

hosted from abroad112,266
displaced inside it6,815
Burundi nationals abroad383,190

stayed inside their own country crossed a border

How to read this: count the squares — 10,000 people each, so the rows can be compared with one another. The last row is people from Burundi living in another country, wherever they are.

In 2025, 401 people asked for asylum in Burundi for the first time; 13,571 people from Burundi asked for asylum in another country. Of every 100 people from Burundi whose claims were decided that year, 53 were given protection. Who asks for asylum, and who is given it

How the world's displacement is counted

BDI · of every 100 people

How people live in Burundi

Of every 100 people in Burundi in 2025, 16 lived in a city, 73 in a town or suburb and 11 in the countryside.

cities towns and suburbs rural areas

79.9 of every 100 have no electricity at home (2024). 91.4 of every 100 do not use the internet (2024).

How to read this: 100 squares, one for every 100th person, coloured by where they live, as the key says. The same rule is used in every country.

How the world's people live

BDI · adults 25 and over · 2020

How far people in Burundi went in school

Of every 100 adults in Burundi in 2020, 41 never went to school and 6 finished upper secondary or went further.

41 never went to school 28 some primary 21 finished primary 4 finished lower secondary 3 finished upper secondary 3 studied after school

The young went further: 23 of every 100 women aged 25–29 never went to school, against 81.1 of every 100 aged 60–64 (men: 11.9 against 56.5).

Its people aged 15 to 64 are projected to be most numerous in 2095; the ones who finished upper secondary are still growing in 2100.

How to read this: the row is the adults (25 and over) shrunk to 100 people, coloured by how far each went in school, least schooling on the left. The Wittgenstein Centre's count, 2020.

How far the world's people went in school

BDI · cities · 2025

Cities in Burundi

Burundi had 12 cities in 2025, home to 2.3 million people. The largest, Bujumbura, holds 9 of every 100 people in Burundi.

Bujumbura1,246,960
Gitega198,363
Ngozi167,196
Kayanza131,192
Muyinga114,914
Rumonge107,773
Bubanza67,472
Kirundo64,574
Cibitoke61,232
Giteranyi60,393

All 6 cities in Burundi that reach 300,000 people

Bujumbura 1,246,960
Gitega 198,363
Ngozi 167,196
Kayanza 131,192
Matongo 118,597 (2035)
Mbuye 166,660 (2045)

How to read this: one bar for each of the 10 largest cities, 2025, all on the same scale. "City" here means the built-up area the UN measures, not the boundary the city draws itself.

All the world's cities

Apparatus

Sources and method

Every figure on this page comes from the UN's World Population Prospects 2024: the annual country tables (estimates to 2023, projections with 95% intervals from 2024), and the population by single year of age and sex for the pyramid.

The censuses, surveys and registers behind the UN's estimates for Burundi are listed, source by source, on the UN's own data sources page.

Sources: UN WPP 2024 · World Bank · UNHCR · country code lists · UN WUP 2025 · Wittgenstein Centre · WHO GHO · flag-icons · Natural Earth. Every source, its licence and how to cite it →

Checked before it was drawn

Verified 2026-09-30 · 73 canaries The pyramid for every year was checked against the published total. What that stamp counts, and what every page here has to pass before it can be built: how this site checks its figures.