About Running Toolkit
Running Toolkit is a collection of simple, transparent calculators for runners who want practical planning numbers without black-box outputs.
Who Maintains This Site
Mark Portman is an amateur runner and the creator of Running Toolkit. He geeks out on running data and builds calculators that make pace, speed, and training estimates easier to understand.
Running Toolkit is published by Hiddenwork Development. The site focuses on clear formulas, source links, implementation checks, and plain-language limitations so runners can understand how each result is produced.
Editorial Review Policy
Running Toolkit pages are reviewed when formulas, sources, implementation tests, or calculator behavior change. Corrections prioritize transparent formulas, source links, and plain-language limitations.
Articles and calculators do not currently use an external reviewer. When a qualified reviewer is involved, the page should name that reviewer and show the review date.
Health and Training Disclaimer
The tools are for planning, education, and comparison. They are not medical advice, nutrition prescriptions, coaching plans, or lab measurements. Consult a qualified professional for personal health, injury, nutrition, or training decisions.