About three miles an hour, but it varies depending on terrain.
As far as we can tell, Google Maps doesn’t publish its method of working out your walking speed.
We asked, but they haven’t replied yet – so we did some tests.
On a fairly flat piece of Surrey countryside (with pavements) Google reckons it should take you an hour to walk three miles. Our maths department tells us that’s three miles per hour.
So far so good, but what if you go up or down a hill?
Posting online, one Google employee said Google Maps accounts for this sort of thing.
To check, we chose Edinburgh’s famous Royal Mile, which slopes from Edinburgh Castle down to the Palace of Holyroodhouse.
But here Google might’ve got too big for its digital boots, as Ben-Nevis.com says it takes three-and-a-half to four hours – or even longer – just to reach the top.