Steps To Calories Calculator

Steps To Calories Calculator — Steps-to-Calories AI Skill Backed by Peer-Reviewed Research

**Find out exactly how many calories your walk burned — calculated from a real biomechanics study, not a generic guess.**

An open-standard [agentskills.io](https://agentskills.io/specification) skill that turns any compatible AI agent into a walking-calorie calculator. It asks for body weight and step count, then computes net calories burned walking using the metabolic-cost-per-stride relationship established in a controlled treadmill study published in the _Journal of Experimental Biology_.

100% self-contained. No API keys, no fitness-tracker integration, no external services — just weight, steps, and one formula.

Compatible with

• Claude (Claude Code, Claude apps, Claude Skills)
• OpenClaw / ClawHub
• Hermes Agent (Nous Research)
• Any other agent supporting the agentskills.io open standard

What it does

1. Asks for body weight (kg or lb, auto-converts).
2. Asks for step count (a walk, or a daily total).
3. Optionally checks pace/terrain to flag when the estimate is less reliable (steep inclines, loaded backpacks, non-walking gaits).
4. Computes: calories_kcal = 2.74 × weight_kg × (steps ÷ 2) ÷ 4184.
5. Shows the full calculation so the result is auditable, and states the ~9% margin of error the source study reports — no false precision.

The science

Formula is derived from:

Weyand, P. G., Smith, B. R., Puyau, M. R., & Butte, N. F. (2010). _The mass-specific energy cost of human walking is set by stature._ Journal of Experimental Biology, 213(23), 3972–3979. DOI: [10.1242/jeb.048199](https://doi.org/10.1242/jeb.048199)

The study measured, via indirect calorimetry, that humans spanning a 6-fold range in body mass and ages 5–32 expend an essentially constant **2.74 J per kg of body mass per stride** when walking at a normal, self-selected pace on level ground. A stride = 2 steps, so the formula div