Every number on SnapStepsCalc uses one of the four formulas on this page. No proprietary "black-box" adjustments — just the same equations used in peer-reviewed exercise physiology and public-health research.

1. Stride length from height

We estimate one step's length as a fraction of the walker's standing height. This is the standard approach in gait research and matches within ~5% of measured stride length at a normal pace:

stride_m (men)   = height_cm × 0.415 / 100
stride_m (women) = height_cm × 0.413 / 100
stride_m (avg)   = height_cm × 0.414 / 100

When the user does not enter a height we default to an average adult stride of 0.74 m — the mean value reported by the ACSM adult reference population.

Source: American College of Sports Medicine, ACSM's Guidelines for Exercise Testing and Prescription, 11th ed., 2022, p. 156.

2. Steps to distance

distance_km    = steps × stride_m / 1000
distance_miles = distance_km × 0.621371

A 1.75 m tall adult with a 0.72 m stride covers 7.2 km (4.47 miles) in 10,000 steps. Change any of the three inputs — steps, height or pace — and the whole chain recomputes.

3. Calories burned (MET-based)

We use the Metabolic Equivalent of Task (MET) system — the same one that powers the Compendium of Physical Activities (Ainsworth et al., 2011).

kcal = MET × weight_kg × duration_hours

Walking MET values used:
  3.2 km/h (leisurely)  →  MET 2.8
  4.0 km/h (casual)     →  MET 3.0
  5.0 km/h (moderate)   →  MET 3.5
  5.6 km/h (brisk)      →  MET 4.3
  6.4 km/h (fast)       →  MET 5.0
  7.2 km/h (very fast)  →  MET 6.3

For every calculator page we compute duration from duration_hours = distance_km / pace_kmh and use the MET value that matches the selected pace.

Source: Ainsworth BE, Haskell WL, Herrmann SD, et al. "2011 Compendium of Physical Activities: A Second Update of Codes and MET Values." Med Sci Sports Exerc. 2011;43(8):1575-1581.

4. Walking Plan™ intensity thresholds

The Walking Plan classifies effort using WHO's 2020 physical activity guidelines. Moderate-intensity walking is defined as 3.0–6.0 METs; anything below is recovery, anything above is vigorous.

Recovery — under 3.0 METs (pace < 4 km/h). Great for daily steps and mobility, minimal cardio load.
Daily fitness — 3.0–3.9 METs (4.0–4.9 km/h). Counts toward WHO's 150 min / week moderate-activity target.
Fat-burning — 4.0–5.0 METs (5.0–6.3 km/h). The zone where a high proportion of energy comes from fat oxidation.
Endurance — 5.1+ METs (> 6.3 km/h). Counts toward WHO's 75 min / week vigorous-activity target.

Source: World Health Organization, WHO Guidelines on Physical Activity and Sedentary Behaviour, 2020. See also Bull FC et al., Br J Sports Med 2020;54:1451-1462.

Assumptions and limits

All formulas assume level ground. Incline, stairs and uneven terrain can raise energy expenditure by 20–60%.
MET values are population averages. Real energy cost varies with fitness, age, footwear and gait economy.
Body composition is not modelled. Two 70 kg adults with different fat-free mass will burn slightly different amounts of energy.
Numbers are estimates for planning, not medical advice. Talk to a clinician before starting a new exercise program.

How your data is handled

All calculations run in your browser. Nothing you enter — height, weight, step count, goals — is sent to a server or stored anywhere except your own device (when you opt in to the local progress tracker). See our Privacy Policy for the full details.

How we calculate steps, distance and calories