Outdoor tools

Distance and elevation difficulty calculator

Use the Distance and elevation difficulty calculator to calculate practical planning results from your outdoor activity inputs.

Grade angle and percent converter

Use the Grade angle and percent converter to calculate practical planning results from your outdoor activity inputs.

Elevation gain rate calculator

Divides elevation gain by hiking hours and distance to output your climbing rate in meters per hour and per kilometer.

Sunset descent margin calculator

Checks remaining descent distance and hiking speed against minutes to sunset and a safety buffer to flag whether you'll make it down in time.

Recommended hiking start time calculator

Works backward from sunset time using round-trip distance, elevation gain, and break minutes to recommend a hiking start time.

Hiking water calculator

Estimate trail water from duration, temperature, altitude, and body weight.

Backpack weight calculator

Calculate a recommended pack-weight range from body weight and trip style.

Hiking checklist

Build and save a gear checklist by season and hike type.

Seasonal hiking gear generator

Generate season-specific hiking gear for spring, summer, autumn, or winter.

Temperature and altitude clothing recommender

Adjusts starting temperature for elevation gain, wind speed, and rain to recommend how many clothing layers to pack for the summit.

Altitude temperature change calculator

Takes elevation gain, starting temperature, and a lapse rate to project the altitude-adjusted summit temperature and whether extra insulation is needed.

Altitude sickness risk reference

Use the Altitude sickness risk reference to calculate practical planning results from your outdoor activity inputs.

GPX distance and elevation analyzer

Parse GPX locally in the browser for distance, ascent, descent, and altitude range.

GPX to KML converter

Convert GPX tracks to KML LineString files entirely in the browser.

Compass bearing calculator

Calculate initial bearing and great-circle distance between two coordinates.

Hiking group speed calculator

Uses the slowest hiker's speed among a group list, plus distance and elevation gain, to project a realistic total hiking time.

Headlamp runtime calculator

Combines battery capacity, current draw, and a reserve percentage to estimate conservative runtime hours against your planned night hike time.

Power bank runtime calculator

Estimate charges and extra runtime from capacity, device battery, and efficiency.

Hiking safety checklist

Check weather, descent time, contacts, and procedure before leaving.

Hiking log card generator

Fills a trail name, hours, and note into distance and elevation figures to generate an average speed, climb rate, and log card table.

Avalanche slope reference

Use the Avalanche slope reference to calculate practical planning results from your outdoor activity inputs.

UV exposure reference calculator

Use the UV exposure reference calculator to calculate practical planning results from your outdoor activity inputs.

Naismith hiking pace calculator

Open Naismith hiking pace calculator to calculate inputs and organize the results.

Hiking slope calculator

Open Hiking slope calculator to calculate inputs and organize the results.

Hiking calories calculator

Open Hiking calories calculator to calculate inputs and organize the results.

Backpacking food calorie calculator

Open Backpacking food calorie calculator to calculate inputs and organize the results.

Feels-like temperature calculator

Open Feels-like temperature calculator to calculate inputs and organize the results.

Trekking pace calculator

Open Trekking pace calculator to calculate inputs and organize the results.

Arrival time with breaks calculator

Open Arrival time with breaks calculator to calculate inputs and organize the results.

Coordinate format converter

Open Coordinate format converter to calculate inputs and organize the results.

Map scale distance calculator

Open Map scale distance calculator to calculate inputs and organize the results.

Fishing line capacity calculator

Use the Fishing line capacity calculator to calculate practical planning results from your outdoor activity inputs.

Line diameter and size converter

Use the Line diameter and size converter to calculate practical planning results from your outdoor activity inputs.

PE braided line size converter

Use the PE braided line size converter to calculate practical planning results from your outdoor activity inputs.

Sinker size and weight converter

Use the Sinker size and weight converter to calculate practical planning results from your outdoor activity inputs.

Fish length to weight calculator

Use the Fish length to weight calculator to calculate practical planning results from your outdoor activity inputs.

Fishing trip checklist

Use the Fishing trip checklist to calculate practical planning results from your outdoor activity inputs.

Casting distance calculator

Use the Casting distance calculator to calculate practical planning results from your outdoor activity inputs.

Reel gear retrieve calculator

Use the Reel gear retrieve calculator to calculate practical planning results from your outdoor activity inputs.

Rod power and line guide

Matches a lure weight in grams to a recommended rod power class, from ultralight to extra-heavy, and a matching line pound-test range.

Sinker weight by depth recommender

Weighs water depth and current strength, plus a surf, boat, or finesse note, to suggest a light-to-heavy sinker weight range in grams.

Wind and point direction calculator

Compares a wind direction and a casting or point direction in degrees to report the angle difference and whether it is a head, tail, or crosswind.

Fishing knot selection guide

Use the Fishing knot selection guide to calculate practical planning results from your outdoor activity inputs.

Fish minimum size checker

Use the Fish minimum size checker to calculate practical planning results from your outdoor activity inputs.

Fish closed season calendar

Use the Fish closed season calendar to calculate practical planning results from your outdoor activity inputs.

Catch log

Records species, length, weight, and spot for each catch on its own line, then totals the weight and finds the most-caught species.

Fishing cost calculator

Use the Fishing cost calculator to calculate practical planning results from your outdoor activity inputs.

Tide term converter

Use the Tide term converter to calculate practical planning results from your outdoor activity inputs.

Seawater salinity calculator

Divides dissolved salt amount by water volume to compute salinity in parts per thousand and compare it against standard seawater.

Fish target by water temperature

Reads a water temperature in Celsius and matches it against a species table to suggest which fish are likely active right now.

Lure weight unit converter

Open Lure weight unit converter to calculate inputs and organize the results.

Boat fishing cost split

Open Boat fishing cost split to calculate inputs and organize the results.

Camping checklist

Save a checklist by camping style, people, and season.

Camping water calculator

Calculate drinking and reserve water by people, nights, and activity level.

Camping power usage calculator

Add device watts and hours to estimate required battery Wh.

Power station runtime calculator

Estimate runtime from power-station Wh, device watts, and efficiency.

Camping gas fuel calculator

Estimate canister count from burner output, usage time, and can size.

Firewood calculator

Use the Firewood calculator to calculate practical planning results from your outdoor activity inputs.

Surfboard volume calculator

Use the Surfboard volume calculator to calculate practical planning results from your outdoor activity inputs.

Diving air consumption calculator

Use the Diving air consumption calculator to calculate practical planning results from your outdoor activity inputs.

Scuba MOD calculator

Use the Scuba MOD calculator to calculate practical planning results from your outdoor activity inputs.

Kayak paddle length calculator

Use the Kayak paddle length calculator to calculate practical planning results from your outdoor activity inputs.

Camping food calculator

Open Camping food calculator to calculate inputs and organize the results.

Tent size recommender

Open Tent size recommender to calculate inputs and organize the results.

Bike cadence and gear speed calculator

Use the Bike cadence and gear speed calculator to calculate practical planning results from your outdoor activity inputs.

Cycling calories calculator

Use the Cycling calories calculator to calculate practical planning results from your outdoor activity inputs.

Bike tire pressure reference

Use the Bike tire pressure reference to calculate practical planning results from your outdoor activity inputs.

Marathon time predictor

Use the Marathon time predictor to calculate practical planning results from your outdoor activity inputs.

Running split calculator

Use the Running split calculator to calculate practical planning results from your outdoor activity inputs.

Interval training generator

Builds a set-by-set workout timeline from your set count, hard-effort minutes, warmup, and cooldown, with recovery time filled in automatically.

Grade-adjusted pace calculator

Use the Grade-adjusted pace calculator to calculate practical planning results from your outdoor activity inputs.

Ski binding setup worksheet

Use the Ski binding setup worksheet to calculate practical planning results from your outdoor activity inputs.

Golf handicap calculator

Use the Golf handicap calculator to calculate practical planning results from your outdoor activity inputs.

Golf club distance log

Takes a list of clubs and their carry distances, then sorts them longest to shortest so you can build a yardage reference table.

Golf Stableford calculator

Use the Golf Stableford calculator to calculate practical planning results from your outdoor activity inputs.

Billiards score log

Logs player names and scores line by line, then ranks the leader and shows how many points remain to reach your target score.

Bike speed distance time calculator

Open Bike speed distance time calculator to calculate inputs and organize the results.

Bike gear ratio calculator

Open Bike gear ratio calculator to calculate inputs and organize the results.

Running pace calculator

Open Running pace calculator to calculate inputs and organize the results.

Bowling score calculator

Open Bowling score calculator to calculate inputs and organize the results.

Badminton and table tennis bracket generator

Open Badminton and table tennis bracket generator to calculate inputs and organize the results.

Leisure cost splitter

Open Leisure cost splitter to calculate inputs and organize the results.

Ski slope converter

Open Ski slope converter to calculate inputs and organize the results.