*I posted this on another website before I realized they'd patented the site! So I have moved it here.*

The answer depends on your stride length, the length of each step.

Number of kilometers in 10,000 steps =

10,000 steps X Stride Length in kilometers

Stride length can be measured or calculated:

Women .413 * height

Men .415 * height

For example a women of 160cm (5'3") would have a stride length of 160 * .413 = 66.08cm = 0.0006608 km to walk 10,000 steps she must walk:

10,000 steps * 0.0006608 km stride length = 6.608 km

**Of course you can also do the reverse. How many steps did you take if you know how far you've walked:**

Number of steps = Number of kilometers walked / Stride length in kilometers

For example the same woman with stride length 0.0006608 km walks 4 kilometers how many steps has she taken:

4 km walked / 0.0006608 km stride length = 6053 steps