户外与冒险

Free Backpack Weight Calculator — calculate your pack's base weight, total weight, Big Three breakdown, and weight-to-body ratio in lbs and kg. Includes gear checklist for every category, consumable estimators, and weight reduction tips.

Free Bike Frame Size Calculator — find your perfect bicycle frame size using height and inseam length for road, mountain, hybrid, and kids bikes.

Free Bow Draw Weight Calculator — find your actual draw weight at your personal draw length, get archer-profile recommendations, and calculate arrow kinetic energy and hunting suitability.

Free Bullet Drop & Ballistic Trajectory Calculator — compute drop, wind drift, velocity, energy, and time of flight at any range with G1/G7 drag models, atmospheric corrections, and DOPE card export.

免费的野营炉燃料计算器，适用于背包旅行和露营。估算所需的总燃料（克和盎司），获取罐装推荐，比较尺寸，并检查部分罐装。

Free Cycling Power Output Calculator — compute required watts from speed, or find achievable speed from power, using real physics (gravity, aerodynamic drag, and rolling resistance).

Free Elevation Gain Calculator — calculate total elevation gain, grade percentage, difficulty scores, energy miles, and calories burned for hiking, running, and treadmill workouts.

Free Fish Weight Estimator — estimate the weight of your catch using species-specific formulas. Supports 30+ freshwater and saltwater species with length + girth or length-only calculations, body condition scoring, relative weight (Wr) index, trophy comparison, and catch log with CSV export.

Free Fishing Line Strength Calculator — convert between PE number, diameter, monofilament, and braided line ratings. Includes knot strength estimator, species recommendations, line condition factor, and safe working load.

Free Game Meat Yield Calculator — estimate boneless meat yield, freezer space, servings, and cost savings from any big game animal including deer, elk, moose, bear, and more.

Free World Handicap System (WHS) Golf Handicap Index calculator. Enter up to 20 rounds to compute your official Handicap Index, Course Handicap, Playing Handicap, and score differentials — with trend chart, round history, and CSV export.

Free Hike Time Estimator — calculate hiking time using Naismith's Rule, Book Time, Tobler's Function, Langmuir, and Tranter corrections. Supports multi-segment routes, terrain, fitness, pack weight, weather, and group adjustments.

Free Hiking Calorie Calculator — estimate calories burned hiking based on your body weight, pack load, distance, elevation gain, terrain type, altitude, and temperature. Includes multi-day trip planner and food weight estimator.

Free Kayak Size Calculator — find the right kayak length, width, weight capacity, and hull volume for your height, weight, kayak type, and paddling style.

Free Marathon Pace Calculator — calculate your required pace from a target finish time, generate per-mile and per-km split tables, predict race times across distances using Riegel's formula, and get VDOT-based training zones.

Free Rock Climbing Grade Converter — instantly convert between YDS, French, UIAA, British, Australian, South African, Hueco V-Scale, and Fontainebleau bouldering grades with difficulty band labels and a full reference table.

点击使用此免费工具

点击使用此免费工具

点击使用此免费工具

免费睡袋温度评级计算器 — 根据夜间最低气温、庇护类型、风、湿度、高度、衣物层数和内衬保暖性，找到您所需的确切EN/ISO舒适和最低限度评级。包括睡眠系统比较器和垫子R值适用性检查。

点击使用此免费工具

点击使用此免费工具

Free tent capacity calculator for event tents and camping tents. Enter your guest count or tent dimensions to find the right tent size for any occasion.

点击使用此免费工具