About Trailomen
Trailomen does one thing: pre-trip hiking math. How long a route really takes, how much water to carry, how many calories the day costs, what the pack should weigh, and how cold the summit will feel. Nothing else — no trip reports, no gear reviews, no social feed.
Why we built it
Hiking apps are excellent at recording what you did. Almost nothing is good at telling you what to expect before you go — and the generic calculators that exist tend to use fitness-app math that ignores elevation, load, and terrain, the three things that define hiking. We wanted the planning tools mountain clubs teach on paper, as fast interactive pages.
Our methodology
Every calculator is built on a published, citable model — never a tuned-by-feel constant:
- Hiking time — Naismith's rule (1892) with terrain corrections after Langmuir's Mountaincraft and Leadership.
- Energy — the Pandolf load-carriage equation (Pandolf, Givoni & Goldman, 1977, USARIEM) with Soule & Goldman terrain factors.
- Water — US National Park Service hiking-safety guidance (0.5–1 L/h) with heat, altitude, load, and sun adjustments.
- Wind chill — the JAG/TI standard adopted by the US National Weather Service and Environment Canada in 2001, plus the ISA lapse rate for altitude cooling.
- Pack weight — community-standard base-weight definitions and the 20% body-weight guideline used across load-carriage research.
Who runs this site & how content is made
Trailomen is built and maintained by a small independent team — the Trailomen Editors — combining hands-on hiking experience with software-engineering discipline. Every page follows the same production process: drafts are prepared with AI assistance, then every formula, constant, and safety figure is checked by a human against the original published source before anything ships. The automated test suite re-verifies the formula implementations against hand-computed reference values on every change, and the corrections policy below applies to every word we publish.
Why bother with all this math? A belief, really — one a 16th-century philosopher named Wang Yangming put better than we can: to know and not to act is not yet to know. A plan you never walk is just a spreadsheet. We stand in a long line of people who felt that pull — Thoreau went to the woods to "live deliberately"; John Muir heard the mountains calling and went.
And one more thing the numbers teach: the mountain sets the terms — we only visit. Good math doesn't shrink the wild; it teaches respect for it. Start earlier than feels necessary, carry more margin than the spreadsheet demands, tell someone where you're going, and turn around without shame when the day says no. The summit is optional. Coming home is not. That's what every calculator on this site is really for: so you go prepared, come back safe, and leave the trail as you found it.
Each tool page states its formula's limitations as plainly as its strengths — where a model is not valid, the tool says so instead of inventing a number.
Accuracy & corrections
The formula implementations are covered by an automated test suite checked against hand-computed reference values from the source publications. If you find an error — in the math, a factor, or a citation — please tell us; verified corrections ship fast and are noted on the affected page.
One honest disclaimer
These are planning estimates, not guarantees. Mountains produce weather, terrain, and days that beat any formula. Build in margin, check local advisories, and make conservative calls on the ground — the calculator is the start of good judgment, not a substitute.