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Your height. It's just genetics, right?

Actually, no. If you grew up in a country without proper toilets, the chances are you'd have lost a fair few inches along the way.

How tall would you be?

Enter your height to get started:

cm ft/in

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So somewhere between a grasshopper and a giraffe. Perfect!

Next, enter your gender:

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Wow! The results are in – and they're pretty surprising.

Ready to find out how tall you might have been?

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So , puts you the average height.

But if you’d grown up in you could be a full shorter – in large part because you didn't have access to a basic human right: a decent loo.

Desperate to know why? Share your result, then let's talk toilets:

Undernutrition is a complex issue with a multitude of factors playing a role. The WaterAid Height Calculator is a simplified tool to highlight the link between sanitation and undernutrition. It is based on the best available data but we make no claims as to its scientific accuracy.

© WaterAid/Rajesh Gurung

OK, so lots of things can affect your height, but can having a toilet really make you taller?

The answer is yes – and it's not difficult to see how:

If you were growing up without a proper loo, where would you go instead?

© WaterAid/Adam Ferguson

? That's not very hygienic now is it, If?

In the absence of a proper toilet, germs spread fast. So fast, in fact, you'd soon be very, very ill.

You'd likely get diarrhoea or another infection, which would make things worse.

You'd start to get weak. Your body would stop absorbing vital nutrients – the nutrients you need for your brain to develop. And, of course, for your body to grow.

These aren’t just short-term effects. The consequences last a lifetime.

How can I help end this crap situation?
© WaterAid/Ernest Randriarimalala

, share our height calculator on Facebook to champion the life-saving loo:

We're working hard to make sure governments around the world reach the one in three people without a decent toilet by 2030.

Share the calculator with your nearest and dearest and help us get the word out: