How big is a million?

Numbers too big to picture

Close your eyes and picture five apples. Easy! Now picture the kids in your class. Still fine. Now try to picture a million of anything. Most people can't. Our brains are good at small groups, but huge numbers just turn into "lots".

The trick is to compare big numbers with things we already know. First, let's see how they are built. A thousand (1,000) is ten hundreds. A million (1,000,000) is a thousand thousands. A billion (1,000,000,000) is a thousand millions.

Look at the zeros. A thousand has three, a million has six and a billion has nine. This is called place value: each time you add three more zeros, the number becomes a thousand times bigger. So the jump from a million to a billion is just as giant as the jump from a thousand to a million.

Counting in seconds

Imagine counting out loud, one number every second, with no breaks and no sleep. To reach a thousand would take 16 minutes and 40 seconds. That is shorter than a lunch break.

To reach a million would take about 11 and a half days. To reach a billion would take about 31 years and 8 months! So a thousand seconds is part of a lunch break, a million seconds is more than a week and a half, and a billion seconds is more than 30 years.

In real life it would take even longer. A number like "seven hundred and forty-three thousand, two hundred and nineteen" takes a few seconds just to say. And you would need to eat and sleep. Counting all the way to a billion is something nobody could really do.

Filling the footy ground

The Melbourne Cricket Ground, or MCG, is Australia's biggest sports stadium. The AFL Grand Final there can draw up to 100,000 fans. Imagine all those people cheering at once.

Now imagine ten full MCGs. That is a million people. To reach a billion, you would need 10,000 MCGs, every seat taken.

The Australian Bureau of Statistics estimates that 27,921,150 people lived in Australia on 31 March 2026. That is almost 28 million. Our whole country would fill the MCG about 280 times over.

Stacks, squares and cubes

A sheet of printer paper is about 0.1 millimetres thick. A stack of a thousand sheets is about 10 centimetres tall. A stack of a million sheets would be about 100 metres tall, as tall as a 100-metre sprint track standing on its end. A billion sheets would reach 100 kilometres into the sky. If you could drive straight up at 100 kilometres an hour, it would take a whole hour to reach the top.

Squares work too. A square metre split into tiny squares 1 millimetre wide holds 1,000 rows of 1,000 squares. That is exactly a million.

If your classroom has base-ten blocks, the little cube is 1 centimetre on each side, and the big cube is worth a thousand. A million little cubes would fill a cube 1 metre long, 1 metre wide and 1 metre high. A billion would fill a cube 10 metres on every side.

Kilo, mega, giga

Scientists around the world use short word-starters called prefixes to write big numbers quickly. Kilo means a thousand, so a kilometre is 1,000 metres. Mega means a million, so a megalitre is a million litres. Giga means a billion, and tera means a trillion.

An Olympic swimming pool 50 metres long, 25 metres wide and 2 metres deep holds 2.5 million litres, or 2.5 megalitres. In Australia, the water in dams and rivers is often measured in megalitres.

Next time you hear "a billion" in the news, remember what it really means: not just a lot, but a thousand millions.

📚 Words to know

Million

A thousand thousands, written 1,000,000.

Billion

A thousand millions, written 1,000,000,000.

Place value

The value a digit has because of where it sits in a number. In 300, the 3 is worth three hundreds.

Prefix

A word part added to the front of a word. Kilo, mega and giga are prefixes that mean a thousand, a million and a billion.

Estimate

A careful, sensible guess, often worked out using numbers you already know.

🧪 Try this: measure a million

1. Set a timer and count out loud from 1 to 100. How many seconds did it take?
2. Multiply your time by 10,000 to estimate how long it would take to count to a million, because 100 × 10,000 = 1,000,000. Divide the answer by 3,600 to turn seconds into hours. Remember that big numbers take longer to say, so the real time would be even longer.
3. Squeeze together 100 sheets of printer paper and measure the stack with a ruler. It should be about 1 centimetre tall.
4. A million sheets is 10,000 of those stacks. Work out how tall that would be in metres. Then find something in your neighbourhood that is about that tall or long.