The numbers behind the tools

Distance and step count

Distance equals step count multiplied by the length of one step. The reverse calculation divides distance by step length. The tools convert inputs into compatible units before calculating. They use 1 inch = 0.0254 metres, 1 mile = 1,609.344 metres, and 1 kilometre = 1,000 metres. These are exact unit relationships.

The uncertainty is in the walking inputs. Step length changes, devices estimate counts differently, and route measurements can be imperfect. The default 30-inch step length is an illustrative starting value. It is not assigned from your height, age, or sex, and it is not presented as a population average.

Walking time and treadmill steps

Moving time equals distance divided by speed. The calculator converts hours to minutes for the display. Treadmill distance equals belt speed multiplied by duration, after matching the units. Dividing that distance by step length gives an estimated step count.

These calculations assume the selected speed and step length remain representative. They do not automatically account for hills, breaks, speed intervals, or gait changes. Use separate calculations for distinct session segments when that is more appropriate.

Energy estimates

The energy tools estimate minutes as step count divided by cadence in steps per minute, counting both feet. They then use the conventional MET equation: gross kilocalories = MET × 3.5 × body mass in kilograms × minutes ÷ 200. Active kilocalories use MET minus one, excluding the model’s resting baseline. A dietary calorie is a kilocalorie, abbreviated kcal.

Walking intensity values are informed by the 2024 Adult Compendium of Physical Activities. Its level-walking category at 2.8 to 3.4 mph has a value of 3.8 MET. The example cadence of 100 steps per minute is a separate illustrative assumption, not a measured mapping to that intensity. MET values do not measure your individual metabolism.

What we round, and what we do not infer

Results are rounded for readable displays after the calculation. Step counts are shown as whole steps and distances retain a useful number of decimal places. Extra digits do not make the real-world estimate more certain.

The daily goal planner adds a chosen increase to a baseline. It does not generate a medical target. No tool converts estimated energy into a guaranteed weight change. The health guides provide general context and link to public primary sources.

Time-based energy and pace

The walking calorie calculator uses the same MET equation as the steps-based tools but takes minutes directly, so it needs no cadence assumption. The pace calculator divides 60 by speed to give minutes per mile (with speed in mph) or minutes per kilometre (with speed in km/h); seconds are shown by converting the fractional minute. The popular step-count pages apply the distance formula above with a 30-inch example step and quote the range for 26-inch and 34-inch steps so the dependence on step length is visible.

Why your tracker shows a different distance

A phone or watch rarely uses the arithmetic on this page. Most devices either store a step length, estimated from the height and sex you entered at setup or learned from GPS walks, or they drop step counting altogether and measure distance from GPS or from a wheel sensor on a treadmill. Each of those methods has its own error, and they disagree with each other as often as they disagree with us.

That is why a watch, a phone in a pocket and this calculator can all report different distances for the same walk. None is automatically right. The value of the arithmetic here is that every input is visible and editable: if you replace the example step length with one you measured, you know precisely what produced the result. If your tracker lets you set your step length manually, entering a measured value will usually bring the two closer together.

Stair machines and energy per mile

The stair climber calculator uses the same MET equation with the 2024 Adult Compendium values for a stair treadmill ergometer (9.3 MET, code 02065) and for climbing real stairs (4.5 to 9.3 MET, codes 17131–17138). Console levels are not converted, because the Compendium does not map them to MET values.

The calories-per-mile calculator converts a distance into minutes at the chosen speed (minutes = miles × 60 ÷ mph), then applies the MET value the Compendium gives for that walking or running speed. Where the Compendium gives a speed band, the calculator uses a speed inside that band and names it in the option label.