134 estimation questions with answers

83,500,000 residents. Around 83.5 million. About one in five of them lives in North Rhine-Westphalia.

68,400,000 residents. Around 68 million. After Germany, the most populous country in the EU.

9,200,000 residents. A good 9 million. Almost a quarter of them live in greater Vienna.

124,000,000 residents. Around 124 million, and the number has been shrinking for over a decade.

1,440,000,000 residents. Around 1.44 billion. The most populous country in the world since 2023.

335,000,000 residents. Around 335 million. Third place behind India and China.

230,000,000 residents. Around 230 million. The most populous country in Africa.

210,000,000 residents. Around 210 million, more than any other country in South America.

3,900,000 residents. Around 3.9 million, which makes Berlin the biggest city in the EU.

2,000,000 residents. Just under 2 million. One in five Austrians lives in the capital.

1,900,000 residents. Around 1.9 million. Germany's second largest city.

8,849 m. 8,849 meters. Nepal and China remeasured it together in 2020.

2,962 m. 2,962 meters. The highest point in Germany, reachable by cog railway.

4,808 m. Around 4,808 meters. The snow cap gets remeasured every two years.

828 m. 828 meters. The tallest building in the world since 2010.

330 m. 330 meters including the antennas. It was the world's tallest structure until 1930.

157 m. 157 meters. From 1880 to 1884 it was the tallest building in the world.

93 m. 93 meters with the pedestal. The figure alone measures 46 meters.

1,233 km. 1,233 kilometers. Until 2010 the books carried a wrong number for decades.

2,857 km. 2,857 kilometers. It crosses ten countries, more than any other river.

6,650 km. Around 6,650 kilometers. Only the Amazon still challenges it for the length record.

40,075 km. 40,075 kilometers. Measured over the poles, Earth is 67 kilometers slimmer.

384,400 km. Around 384,400 kilometers. Light takes a good second for the trip.

150 million km. Around 150 million kilometers. That distance is called one astronomical unit.

34 km. Around 34 kilometers, between Dover and Calais.

193 km. 193 kilometers, and not a single lock along the way.

28 years. 28 years, from August 13, 1961 to November 9, 1989.

41 years. 41 years, from its founding in 1949 to reunification in 1990.

70 years. 70 years. The longest reign in British history.

66 years. 66 years. The Wright brothers took off in 1903, Apollo 11 landed in 1969.

632 years. 632 years. Foundation stone in 1248, finished in 1880, with a pause of roughly 300 years in between.

4,500 years. Around 4,500 years, and for almost 3,800 of them it was the tallest structure on Earth.

30 m. Up to 30 meters. The largest animal that has ever lived on Earth.

150 t. Up to 150 tons. Its tongue alone weighs as much as an elephant.

110 km/h. Up to 110 km/h, but only for a few hundred meters.

320 km/h. Over 320 km/h, which makes it the fastest animal in the world.

550 cm. Up to 5.5 meters. The neck alone measures about two meters.

6,000 kg. Up to 6,000 kilograms. The heaviest land animal on Earth.

400 years. Around 400 years. The oldest known vertebrate of all.

1,500 g. Around 1.5 kilograms, about as much as 25 chicken eggs.

206 bones. 206 bones. More than half of them sit in the hands and feet.

32 teeth. 32 teeth. Four of them are wisdom teeth, which many people never get.

70 beats. Around 70 beats, which adds up to over 100,000 a day.

100,000 hairs. Around 100,000 hairs. About 100 of them fall out every day.

125 liters. Around 125 liters. Most of it runs through the shower and the toilet.

193 states. 193 member states. South Sudan was the most recent to join, in 2011.

27 countries. 27 countries, since the United Kingdom left in early 2020.

88 keys. 88 keys. 52 white ones and 36 black ones.

86,400 seconds. 86,400 seconds. 60 times 60 times 24.

7,000 languages. Around 7,000 languages. About half of them are considered endangered.

500 seconds. Around 500 seconds, so 8 minutes and 20 seconds.

687 days. 687 Earth days, almost twice as long as a year here.

10,900 m. Around 10,900 meters. Mount Everest would vanish inside it completely.

11,000 m. Around 11,000 meters. It is about minus 50 degrees up there.

300 km/h. 300 km/h, and it only reaches that on a handful of routes.

536 km². Around 536 square kilometers. Germany, Austria and Switzerland share it.

105 m. 105 meters. FIFA prescribes that measurement.

430 g. Between 410 and 450 grams, just as the rules of the game say.

305 cm. 305 centimeters. Exactly ten feet, unchanged since the game was invented in 1891.

11 km. Around 11 kilometers. Midfielders cover the most ground.

8,900,000 residents. Just under 9 million. Around a quarter of them hold no Swiss passport.

1,410,000,000 residents. Around 1.41 billion. India has been narrowly ahead since 2023.

59,000,000 residents. Around 59 million and falling. Italy has one of the oldest populations in Europe.

48,800,000 residents. Just under 49 million. Almost one in seven lives in greater Madrid.

69,000,000 residents. Around 69 million, a good 56 million of them in England alone.

37,000,000 residents. Around 37 million, which makes Poland the fifth largest country in the EU.

1,600,000 residents. Around 1.6 million. Germany's third largest city and its most densely populated one.

8,300,000 residents. Around 8.3 million in the five boroughs. The metro area holds over 19 million.

130,000,000 residents. Around 130 million. One in six of them lives in the Mexico City area.

114,000,000 residents. Around 114 million. Almost all of them live on 5% of the country, along the Nile.

85,700,000 residents. Around 85.7 million. That is two million more than Germany.

283,000,000 residents. Around 283 million, spread over 17,000 islands. Fourth place in the world.

173,000,000 residents. Around 173 million on less than half the area of Germany. The densest big country there is.

144,000,000 residents. Around 144 million on the biggest land area on Earth. Nine people per square kilometer.

41,500,000 residents. Around 41.5 million. Four out of five live within 150 km of the US border.

27,200,000 residents. Around 27.2 million on a whole continent. Most of them sit on the coast.

63,000,000 residents. Around 63 million, with twelve official languages between them.

51,700,000 residents. Around 51.7 million, and shrinking. South Korea has the lowest birth rate in the world.

18,000,000 residents. Around 18 million on 41,000 km². A quarter of the country lies below sea level.

11,800,000 residents. Around 11.8 million, with three official languages: Dutch, French and German.

10,900,000 residents. Around 10.9 million. More than a tenth of them live in Prague.

6,000,000 residents. Around 6 million, on 400 islands plus the mainland. Only 70 of them are inhabited.

10,600,000 residents. Around 10.6 million. Exactly as many as Sweden, on a fifth of the land.

5,600,000 residents. Around 5.6 million on 385,000 km². Room enough for everyone.

2,100,000 residents. Around 2.1 million inside the city limits. The metro area holds 13 million.

8,900,000 residents. Around 8.9 million. Europe's biggest city after Istanbul and Moscow.

2,750,000 residents. Around 2.75 million. The city has been standing for over 2,700 years.

15,700,000 residents. Around 15.7 million, on two continents at once.

24,900,000 residents. Around 24.9 million. One of the biggest cities on Earth by city limits.

10,100,000 residents. Around 10.1 million inside the city. Greater Cairo holds 22 million.

634 m. 634 meters. The tallest tower in the world, and it is built to sway in an earthquake.

368 m. 368 meters. The tallest structure in Germany, and 38 m taller than the Eiffel Tower.

162 m. 162 meters. The tallest church in the world, four meters ahead of Cologne.

508 m. 508 meters. It was the tallest building in the world until 2010.

56 m. 56 meters. It leans by about four degrees, and it used to lean more.

96 m. 96 meters. Big Ben is the bell inside, not the tower.

8,611 m. 8,611 meters. Second highest on Earth and far harder to climb than Everest.

5,895 m. 5,895 meters. Africa's highest point, and it carries a shrinking glacier on top.

4,478 m. 4,478 meters. It was first climbed in 1865, and four of the seven died on the way down.

3,798 m. 3,798 meters. Austria's highest mountain, and 800 m above the Zugspitze.

3,776 m. 3,776 meters. It is a volcano, and it last erupted in 1707.

1,345 m. 1,345 meters. The highest point in Britain, and it is in cloud most days.

1,642 m. 1,642 meters. One lake holds a fifth of all the liquid fresh water on Earth.

3,700 m. About 3,700 meters. The deep sea is the biggest living space on the planet.

459 m. 459 meters, in the Landsort Deep. On average the Baltic is only 55 m deep.

2,500,000 km². About 2.5 million km². It takes 100 years to exchange all its water through Gibraltar.

6,300 km. 6,300 kilometers. The longest river in Asia and third longest in the world.

3,531 km. 3,531 kilometers. Europe's longest river, and it never reaches an ocean.

1,094 km. 1,094 kilometers. It starts in Czechia and ends in the North Sea.

57 km. 57 kilometers. The longest railway tunnel in the world, and it took 17 years to dig.

12,742 km. 12,742 kilometers. At the equator the Earth is 43 km wider than pole to pole.

1,392,000 km. 1,392,000 kilometers. 109 Earths would fit side by side across it.

228 million km. 228 million kilometers. Light takes 13 minutes to get there.

27,600 km/h. 27,600 km/h. One lap around the Earth every 90 minutes, 16 sunrises a day.

6,385 km. 6,385 kilometers as the crow flies. The plane takes about 9 hours going west.

69 years. 69 years, from 1922 to 1991. Shorter than one long human life.

116 years. 116 years, from 1337 to 1453. Whoever named it was rounding down.

67 years. 67 years, from about 1450 to 1517. Without the press the theses would have stayed in Wittenberg.

73 years. 73 years, from 1912 to 1985. It lies 3,800 m down.

131 years. 131 years, from 1876 to 2007. Both were called a toy at first.

66 million years. 66 million years. Birds are the branch that made it through.

54 countries. 54 countries. More than a quarter of all UN member states.

118 elements. 118 elements. The last ones only exist for fractions of a second.

46 chromosomes. 46 chromosomes, in 23 pairs. A potato has 48.

12 people. 12 people, all of them between 1969 and 1972. Nobody since.

600 muscles. About 600 muscles. The smallest sits in the ear and is barely a millimeter long.

24 languages. 24 official languages. Every document has to exist in all of them.

11 time zones. 11 time zones. When Kaliningrad wakes up, Kamchatka is going to bed.

343 m/s. 343 m/s at 20 degrees. In water it is four times that.

1,670 km/h. 1,670 km/h. You never notice, because everything around you turns with you.

900 km/h. About 900 km/h. That is 80% of the speed of sound up there.

2,500,000 liters. 2.5 million liters. 50 meters long, 25 wide, 2 deep.

42,195 m. 42,195 meters. The extra 195 came from the London Olympics in 1908.

22 players. 22 players, eleven per side, goalkeepers included.