Ian Welkins
The person who builds, checks and maintains Treadmill Pace Calculator.
What I build
I am an independent web developer based in Houston, Texas, and I build free, single-purpose calculator websites. Each site takes one narrow subject — a sport, a craft, a household job — and builds the best set of tools it can for that subject alone, instead of spreading thin across everything. Treadmill Pace Calculator is the newest site in that fleet: nine treadmill tools and a pace chart, and nothing that is not about the belt.
The pattern is the same on every site I run. The tools are free, with no accounts and no sign-up, and they run entirely in the visitor's browser. The formulas and data come from published sources — standards documents, peer-reviewed research and professional guidelines — and those sources are named on the page that uses them, so any reader can open the same document and check the same figure. The method is never a trade secret kept in a help centre; it is printed next to the calculator it describes, with worked examples that can be reproduced by hand.
There is no team behind this site. I research the sources, write the pages, build the tools, test the outputs and answer the error reports myself. If a page carries my name, I am the person who checked it — and the person to write to when it is wrong.
How I check the work
My checking process has three steps, and it is the same for a unit conversion as for the incline model. First, the figure is taken from the primary published source — for this site that means sources such as Minetti and colleagues on the energy cost of running at a gradient, Jones and Doust on the treadmill grade that matches road running, Tanaka and colleagues on maximum heart rate, the ACSM intensity classes, and the NIST unit definitions — never copied from another calculator site. Second, every worked example on a page is computed by hand and then reproduced through the site's own code in a test harness, so a broken formula fails loudly instead of shipping quietly. Third, each page states its own limits: where a number is an estimate, where a band is a coaching convention rather than an official standard, and where belt calibration and individual variation will move the real answer.
The Methodology page lists this site's formulas and sources in full, and the editorial policy sets out the standards every page is held to, including how corrections are made and dated. The About page explains why this particular site exists.
One honest limit, stated plainly: I am a developer, not a running coach, and not a medical professional. Nothing on this site is coaching, and nothing on it is medical advice. The calculators give estimates worked out from published formulas — useful for translating a treadmill session into the language of a training plan, but your coach, your doctor and your own legs all outrank a website.
Elsewhere
My public profiles — the same accounts linked from every site in the fleet.
The quickest way to reach me is email at ianwelkins@gmail.com, through the contact page, or — for a wrong number, which is the message I most want — the report-an-error page, which I read myself.