About StepWheelTools

StepWheelTools is a small, independent collection of twenty calculators for the arithmetic of moving — steps, pace, heart rate, gears, tyres and journey costs — built to be fast, private and honest about its own limits.

Why this site exists

Anyone who walks, runs or rides eventually meets the same handful of questions. How far was that, really? What pace does this race time mean? Is this gear low enough for that hill? What will the drive actually cost? The answers exist, scattered across forums, spreadsheets and app screens that each want an account, a subscription or your location history. StepWheelTools gathers the twenty most-asked of those questions into one quiet place where each is answered on a single page, instantly, with nothing asked in return.

The site is deliberately unglamorous technology: static pages, hand-written code, no accounts, no database, no tracking of what you calculate. Your weight, your dates and your race times never leave your device because architecturally they cannot — there is nothing here to send them to.

How we choose and check the maths

Every tool rests on a named, published method wherever one exists: Riegel’s exponent for race prediction, Mifflin-St Jeor for resting energy, the Compendium of Physical Activities for exercise burn, the US Navy circumference method for body fat, the Karvonen method for heart-rate zones, and plain geometry for wheels and tyres. Where a method has a known error band, the tool page says so in numbers. Before publication, each calculator is checked against hand-worked examples, and the site’s pages are machine-checked for broken links and unwired form fields.

What we will not do

We will not present an estimate as a measurement, invent precision a formula does not have, or turn a health-adjacent number into a diagnosis. BMI, body fat and heart-rate zones are planning aids; the disclaimer page explains their boundaries, and nothing on this site replaces a clinician who knows your history.

Corrections and requests

If a number looks wrong, we want to know — the contact page reaches a human, and corrections are published with the same prominence as the original figure. Tool requests are read and counted; the homepage’s “what is not here yet” section is written from them.