All estimation questions
Questions that sound impossible, with answer, reasoning and source. It is most fun to guess first.
Guess it yourself and earn points
- A bacterium divides every 20 minutes. How many are there after 10 hours?
- A garden snail crawls once around the Earth at top speed without a break. How many years does it take?
- A high-speed train runs non-stop to the Moon at 300 km/h. How many days does the trip take?
- A large raindrop falls from a cloud 1,000 metres up. How many seconds does it take to reach the ground?
- A mosquito buzzes around your head for one minute. How many times does it beat its wings?
- A rope lies tight around the equator. You make it 1 metre longer. How many centimetres does it now float above the ground everywhere?
- A streaming service has 100 million songs. How many years would you need to hear each one once?
- A tap drips once per second. How many litres are lost in a year?
- All billionaires in the world split their entire wealth evenly among everyone on Earth. How many dollars do you get?
- All of humanity stands shoulder to shoulder, 4 people per m². How many km² do they need?
- All the gold ever mined is cast into one cube. How many metres long is one edge?
- All the land on Earth is shared out fairly. How many football pitches does each person get?
- All the plastic the world makes in one year is shared out among everyone. How many kilograms does each person get?
- Bees collect the nectar for 1 kg of honey. How many times could they circle the Earth with that flight distance?
- Every euro coin ever issued is laid out in a row. How many times would the chain reach the Moon?
- Everyone on Earth is packed into one cube. How many metres long is one edge?
- Everyone on Earth says “hello” one after another, one second each. How many years does it take?
- From age 15 to 80 you look at your phone 3.5 hours every day. How many years is that in one stretch?
- How fast does the Earth race around the Sun, in km/h?
- How many 1-euro coins does it take to cover a football pitch?
- How many 100 g bars of milk chocolate does a 70 kg runner burn in a marathon?
- How many A4 sheets cover a football pitch?
- How many ancestors did you have 20 generations ago?
- How many ants are there for every single human?
- How many babies are born worldwide in a single day?
- How many breaths does a person take in 80 years?
- How many cells make up a human body?
- How many cups of tea do the British drink in a day?
- How many days does a person live who reaches 80?
- How many days in one stretch does a person spend brushing teeth in a lifetime?
- How many dollars of revenue does Apple make every second?
- How many drops of water fill a bathtub?
- How many earthquakes are detected worldwide on a single day?
- How many Earths fit side by side in the gap between the Earth and the Moon?
- How many Earths would fit inside the Sun?
- How many eggs does a queen bee lay in a single day at the height of summer?
- How many football pitches of tropical primary forest were lost every minute in 2024?
- How many footballs fit into a truck trailer?
- How many full bathtubs flow down the Rhine at its mouth every second?
- How many golf balls fit into a bus?
- How many Google searches happen every second?
- How many grains of sand are in a 10-litre bucket?
- How many hairs does a person lose in 80 years?
- How many hairs grow on a human head?
- How many kilograms does 1 billion euros weigh in 100-euro notes?
- How many kilograms does a blue whale's tongue weigh?
- How many kilograms does the air in a 25 m² living room with a 2.5 m ceiling weigh?
- How many kilometres does a person walk in 80 years at 7,500 steps a day?
- How many kilometres does an Arctic tern fly in its lifetime?
- How many kilometres does the Moon travel along its orbit in one day?
- How many kilometres of stone-paved roads did the ancient Romans build?
- How many kilometres tall is a stack of 1 trillion dollars in 100-dollar bills?
- How many LEGO pieces are made worldwide every second?
- How many litres of air do you breathe in a day?
- How many litres of blood does your heart pump in a day?
- How many litres of milk does it take to make one kilogram of cheese?
- How many litres of saliva does a person make in 80 years?
- How many litres of water do you use in a year if you shower for 10 minutes every day?
- How many litres of water does a large oak tree release through its leaves in one year?
- How many litres of water does a single cup of coffee take, from the bush to the cup?
- How many litres of water does it take to make a single pair of jeans?
- How many metres of fingernail do you grow in a lifetime, all ten fingers together?
- How many metres of hair grow on your head per day, all hairs added together?
- How many metres tall is a stack of 1 billion euros in 100-euro notes?
- How many minutes does a radio signal take to reach Mars when it is farthest from Earth?
- How many Moons would fit inside Earth?
- How many new red blood cells does your body make every second?
- How many Olympic swimming pools of rain and snow fall on Earth every second?
- How many Olympic swimming pools pour over Niagara Falls in one hour?
- How many people are sitting in a plane somewhere in the world right now?
- How many people board a plane worldwide in a single day?
- How many people fit shoulder to shoulder on a football pitch?
- How many people have ever lived on Earth?
- How many people must be in a room for a better than 50% chance that two share a birthday?
- How many people must hold hands to reach once around the equator?
- How many people would have to stand on each other’s shoulders to reach the height of Mount Everest?
- How many pizzas are baked in Italy in a single day?
- How many smartphones are sold worldwide in a single day?
- How many stars in the whole sky are bright enough to see with the naked eye?
- How many steps does it take to walk once around the Earth?
- How many stone blocks make up the Great Pyramid of Giza?
- How many times can light travel around the Earth in a single second?
- How many times do you blink in a day?
- How many times does a heart beat in 80 years?
- How many times does lightning flash on Earth in a single day?
- How many times does the International Space Station orbit the Earth in a day?
- How many times must you fold a sheet of paper (0.1 mm thick) for the stack to reach the Moon?
- How many tonnes does 1 million euros weigh in 1-euro coins?
- How many tonnes does a fair-weather cloud weigh?
- How many tonnes of air press down on every square metre of ground?
- How many tonnes of dust from space settle on Earth every day?
- How many trees are cut down worldwide every second?
- How many trees are there on Earth per person?
- How many watts does your brain use?
- How many WhatsApp messages are sent every second?
- How many words does a person speak in 80 years?
- How many years in total does a person who reaches 80 spend asleep?
- How many years of video are uploaded to YouTube every day?
- How many years would an airliner take to fly to the nearest star?
- How much buying power do 100 euros have after 50 years of 2% inflation?
- In how many ways can you arrange 10 books on a shelf?
- One cent doubles every day for 30 days. How many euros do you end up with?
- Someone invests one euro in the year 1 at 1% interest. How many euros is it today?
- Squeeze the history of the Earth into a single day. How many seconds before midnight do modern humans appear?
- The Eiffel Tower is melted down and cast as a slab exactly over its footprint. How many centimetres thick is the slab?
- The richest person in the world splits their entire fortune evenly among everyone on Earth. How many dollars do you get?
- The water of all the oceans is shared among everyone. How many litres does each person get?
- The whole atmosphere is shared out fairly among everyone. How many tonnes of air does each person get?
- You count out loud, one number per second, without a break. How many years until you reach one billion?
- You drive to the Sun at 130 km/h without a break. How many years does it take?
- You earn 15 euros an hour, 40 hours a week. How many years until you have 1 billion?
- You get 1 dollar every second. How many years until you are as rich as the richest person in the world?
- You roll 6 dice. One in how many rolls shows six sixes?
- You save 5 euros every day for 40 years and earn 7% interest. How many euros do you have at the end?
- You spend 1,000 euros every day. How many years does one billion euros last?
- You spend 10,000 dollars every day. How many years does the wealth of all the world's billionaires last?
- You walk around the Earth, 8 hours a day at 5 km/h. How many days does it take?
- You work for 45 years, 220 days a year, 8 hours a day. How many years is that in one stretch?
- Your DNA is printed out as letters. How many thick books (500 pages) do you need?
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