Two people walk the same route. One finishes on 9,400 steps and the other on 7,100, and both of them read the number as if it meant the same thing. It doesn't. Step length scales with height, so a shorter walker banks more steps for the identical distance — and a taller one can walk further while a watch congratulates them less.
This converts between the two. Put your height in, and it will tell you roughly how long your step is, how many of them make a mile, and what any given daily number is actually worth on the ground.
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How to use the number
The point of this isn't the trivia. It's that a step target you inherited from somewhere else may be describing a completely different walk than the one you're actually doing.
If you're 5 foot 2, ten thousand steps is around four miles. If you're 6 foot 3, the same ten thousand is closer to five. Same target, an extra mile a day, and nothing on the screen tells either person that. The number is not the thing. The distance and the pace are the thing, and the counter can only see one of them.
So the useful moves are the same ones in the article. Take a Baseline Fortnight and find out what you're genuinely doing. Run it through here to see what it's worth on the ground. Then set a floor you could hit on a bad day rather than a target that turns most of the week into a failure.
And if you want to know whether a walk counted for anything beyond the tally, the counter can't help you — but the Legs-and-Lungs Test can, in about thirty seconds and without any equipment at all.
Where the maths comes from
Step length is estimated at roughly 0.414 × your height, a ratio that has been used in pedometer research for decades and holds up reasonably well across most adults. Male and female figures differ by a whisker either side of that, which is why the build setting barely moves the answer.
Pace matters more. Stride lengthens as you speed up, so this applies a modest adjustment — shorter when strolling, longer when you're moving properly — and estimates walking time at about 4, 5 and 6 km/h for the three settings.
- Strolling — pottering, window shopping, walking with someone slower than you.
- Brisk — breathing has changed, you could talk but not sing. This is the default.
- Fast — properly moving, late for something.
None of this is precise to the individual and it isn't trying to be. It's here to stop a number on a screen meaning more than it should.
If you're recovering from illness, managing a heart or lung condition, dealing with joint pain, or you've been told to be careful with exertion, the sensible starting number is the one a GP or physiotherapist gives you rather than one from a calculator.