Trailpedia

The outdoor knowledge graph

Every outdoor term,
clearly defined.

From belay to bergschrund — 514 outdoor terms across nine sports, explained in plain English and cited to the source, with side-by-side comparisons and free, science-based tools.

514terms
9sports
89comparisons
6tools

Interactive tools

Free calculators built on published science — Naismith, Pandolf, ASTM and more.
All tools →
Unit Converter
Distance, temp, weight, pace & more.
Calorie Calculator
Calories burned hiking — Pandolf equation.
Pace & Time
Trip time — Naismith + Langmuir.
Base Weight
Gear list & ultralight tier.
R-Value Advisor
Pad R-value & bag rating.
Grade Converter
YDS · French · UIAA · V-scale · Font.

Settle the debate

89 honest, side-by-side comparisons to help you choose.
All comparisons →
Skiing vs SnowboardingDown vs SyntheticBoots vs Trail runnersCanister vs Liquid-fuelSleeping bag vs QuiltFilter vs Purifier
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