Skip to story
ELI5 Yahaaa

A thousand times, not a bit

How Much Bigger Is a Billion Than a Million?

A billion is a thousand millions, a gap so large that counting turns it into years.

A thousandbarely visiblehereA milliona thousandthousandsA billiona thousandmillions
These words sound similar. The quantities are not.
  1. Step 1 of 5

    The words sound alike, so the gap hides.

    How they sound?Two big numbersWhat they are One is a thousand ofthe other

    Million and billion differ by three letters and sound like neighbours, which makes it easy to treat them as roughly similar amounts.

  2. Step 2 of 5

    Each step up multiplies by a thousand.

    A thousand1000A milliona thousandthousandsA billiona thousandmillions

    A thousand thousands is a million. A thousand millions is a billion. Every new name is not a bit more, it is a thousand times more.

  3. Step 3 of 5

    Turning them into seconds makes it obvious.

    A million seconds: 11daysA billion seconds: 32years

    A million seconds is under a fortnight. A billion seconds is nearly 32 years. Same word ending, wildly different amounts of life.

  4. Step 4 of 5

    Counting a billion is not humanly possible.

    1 One number asecond2 Never stopping3 32 years toreach a billion

    Counting one number a second without sleeping would take about 32 years to reach a billion, and you would still be counting.

  5. Step 5 of 5

    This is why big-number news is hard to judge.

    A million poundsa good houseA billion poundsa thousand ofthose houses

    A headline saying a million or a billion feels similar, yet the second is a thousand times the first. The wrong word changes everything.

    A million seconds is 11.5 days and a billion seconds is 31.7 years — the same words, a difference you could live through.

The short version

A billion is a thousand millions, and converting both into seconds turns an abstract gap into eleven days against thirty-two years.

Try it yourself

Ask someone to guess how long a billion seconds is. Almost everyone guesses far too short, usually months rather than decades.

Topics