UD5 Toolkit
Tent Size Calculator – How Many People Fit Comfortably?
Find the right tent size for your group. Converts person count to recommended floor area and dimensions, accounting for gear storage and comfort.
Outdoor & Adventure
41+ toolsHike Difficulty Rating Calculator – Distance & Elevation Gain
Rate a hike's difficulty based on distance and total elevation gain using common formulas (Naismith's rule, Shenandoah). Plan your outdoor trips with confidence.
Campsite Level Check – Phone Clinometer for Your Sleeping Platform
Use your phone's accelerometer as a digital level to see how tilted your sleeping platform is. Find the best spot to park.
Tinder Identification Quiz – Can You Find Dry Fluff in the Rain?
Identify the best natural tinder sources from photos. Practice before you're in a real emergency.
Packraft Inflation Pressure Guide – PSI for Water Temperature
Enter the water temperature to see the recommended packraft pressure. Avoid over‑inflation on hot days that can burst seams.
Camp Chair Seat Height Selector – Comfort for Tall & Short Campers
Enter your height and see whether a low‑style, standard, or high‑back camp chair will be easiest to get in and out of.
Field Repair Kit Planner – Build a Custom Kit for Your Activity
Select your outdoor activity and trip length to generate a list of essential repair items: tenacious tape, needle, thread, zip ties, etc.
Down Loft Restoration Checker – Tumble Dry with Tennis Balls
Photos show good loft vs flattened loft. Instructions for low‑heat drying with tennis balls to re‑fluff down after storage.
Crampon Anti‑Balling Plate Compatibility Checker
Select your crampon model to see if a factory or aftermarket anti‑bailing plate is available and how to attach it.
Bear Bag Hang Calculator – Height, Branch Distance & Counterweight
Calculate the required rope length and branch height to properly hang a bear bag 12 ft high and 6 ft from the trunk.
DIY Handwashing Station Planner – Bottle, Soap & Bleach Setup
A visual guide to setting up a simple handwashing station with a water jug, soap, and a strainer for group camps.
Compression Sack Volume Calculator – Before & After Straps
Enter the loft of your clothes and the sack dimensions to see how small it gets when compressed. Pack more efficiently.
Camp Grill Grate Gap Safety – Prevent Food Falling Through
Enter the gap between bars and the size of your food pieces to see if they'll fall through. Use foil or a griddle if needed.
Personal Poop Kit Inventory – Build a LNT Bathroom Bag
Select your trip type and group size to get a list of items for a complete backcountry bathroom kit. Stay clean and pack it out.
Offline Map Rectangle Viewer – Does Your Tile Set Cover This Area?
Draw a rectangle on a world map and the tool displays the approximate latitude/longitude bounds. Helps you confirm offline map downloads.
Multi‑Use Gear Savings Calculator – One Item, Many Jobs
List two items you plan to replace with one multi‑use item and see the weight and space saved. Simplify your pack.
River Crossing Safety Evaluator – Depth & Speed Limits
Enter the estimated water depth and current speed to assess if it's safe to ford. Know when to turn back.
Backpacking Meal Planner – DIY Dehydrated Recipes
Plan lightweight, high‑calorie backpacking meals by selecting ingredients to dehydrate. Get a shopping list and drying times for each component.
Tent Zipper Maintenance Log – Lubricate Before It Snags
Log the number of nights used and get a reminder to apply zipper lubricant before the zipper starts sticking. Prolong tent life.
Campfire Bread Stick Selector – Peeled Willow or Metal Skewer?
Select the type of dough and cooking method to get the recommended stick thickness and wood type for perfect dough‑on‑a‑stick.
WAG Bag Usage Calculator – How Many for Your Trip?
Based on the number of people and days, calculate how many waste alleviation and gelling bags to pack for a Leave No Trace trip.
Head Net Visibility Tester – Which Color Hinders Vision Least?
Upload a scene photo and overlay different head net mesh colors to compare how well you can see through them.
Biodegradable Soap Safe Distance Checker – From Water Source
Even biodegradable soap should be used 200ft from water. Enter the river or lake location and see a circle showing where to wash.
Sleeping Bag Liner Temperature Boost Estimator
Select your sleeping bag's rating and add a liner to see how many extra degrees of warmth you gain. Extend your bag's range.
Bivy Sack Condensation Risk Estimator – Dew Point & Breathability
Enter the overnight temperature and humidity to estimate condensation inside a bivy sack. Decide if you need extra ventilation.
Cliff Jump Safety Depth Calculator – Minimum Water Depth by Height
Enter the jump height to see the absolute minimum water depth recommended. Always check for submerged objects first.
Sawmill Log Length Optimizer – Maximize Usable Lumber
Enter your log diameter and target board dimensions to find the best bucking lengths to minimize waste.
Splitting Maul Weight Selector – Match to Your Strength & Wood
Answer a few questions about your strength and the type of wood you split to get a maul weight recommendation (4 lb to 8 lb).
Filter Backflush Timer – Maintain Flow Rate of Sawyer/Platypus
A reminder to backflush your hollow‑fiber filter after a certain number of liters or when flow rate drops. Keeps water flowing.
Backpack Load Lifter Adjustment Guide – 45‑Degree Angle Check
Use your phone's camera to measure the angle of your load lifter straps. Get feedback on whether they're at the ideal 45° for weight transfer.
Pull Cord Length Estimator – Canyoneering & Caving Retrieval
Enter the rappel length and rope stretch to calculate the minimum pull cord length needed to retrieve your rope from the anchor.
Outdoor Gear Expiration Tracker – Helmets, Ropes & Harnesses
Log the purchase date of safety gear and get alerts based on manufacturer recommended lifespan (e.g., helmets every 5‑10 years).
Mosquito Net Drape Calculator – Achieve 360° Coverage
Enter your sleeping area dimensions to find the ideal suspension point height and line length so the net drapes without touching your skin.
Sternum Strap Height Finder – Prevent Shoulder Strap Slippage
Based on your torso length and pack size, find the optimal height for the sternum strap, usually just below the collarbone.
Knife Sharpening Angle Trainer – Hold Your Pocket Stone Correctly
Use your phone's gyroscope to practice holding a knife at exactly 20° on a flat stone. Build muscle memory for field sharpening.
Flash‑to‑Bang Lightning Distance – Seconds to Miles/Km
Tap when you see the lightning and tap again when you hear thunder. The tool calculates the distance and advises if you're in the danger zone.
Nature Scavenger Hunt Builder – Customize Your Outdoor List
Choose from a list of items (pinecone, bird, yellow flower) to build a custom scavenger hunt. Print and take it on your next nature walk.
Climbing Rope Length Estimator – Sport & Top-Rope Routes
Estimate the minimum rope length required for a climbing route based on wall height and overhang. Prevents coming up short on your next outdoor project.
Tarp Tensioner Knot Tutorial – Adjust Guyline Without Un‑tying
Animated steps to tie a prusik loop onto a guyline and a slipped buntline hitch, creating an easily adjustable tensioning system.
Hammock Structural Ridgeline Length – 83% Rule Calculator
Enter your hammock length to get the ideal fixed ridgeline length (83% of hammock length). Achieve a consistent, comfortable sag.
Geocaching Puzzle Helper – Online Cipher & Coordinate Tool
Common tools for solving mystery caches: base conversions, ciphers, coordinate format converter.