Smart Outdoor Tools for Hikers, Backpackers, and Campers

Enjoy safe and smart adventures with outdoor tools and calculators. These tools help outdoor enthusiasts make informed decisions about water, gear, and trail safety.
Whether you’re planning a one-day or multi-day camping trip, our tools can help you calculate your needs so you can get started with confidence.
 
Calculate Water
Trail Hydration Calculator

Calculate Exactly How Much Water You Need for Hiking

Proper hydration is key to safe and efficient hiking. Our hydration tool helps you determine how much water to drink based on the time of day, temperature, and activity level.
 
Instead of relying on guesswork, this tool provides personalized hydration estimates so you can:
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The Hiking Water Calculator: Built on Sports Science, Not Guesswork.

Our calculator isn’t just a random formula. It’s based on guidelines from the American Hiking Society and hydration studies from the National Institutes of Health (NIH) .

We factor in the variables that matter most:

  • Duration: The longer you're out, the more you sweat.
  • Temperature: Heat index directly impacts fluid loss.
  • Intensity: A steep incline doubles your required intake compared to a flat walk.
  • Body Weight: (Optional) We personalize the math for your specific physiology.
Hydration Studies Hiking

Feature List

Instant Results

Get your number in seconds.

Mobile Friendly

Works on the trail, right from your phone.

Practical Advice

We don't just give you liters. We tell you how many standard 32oz Nalgene bottles that is.

How It Works

Get Your Number in Three Steps

Step 1​

Enter your hike details (Time, Temp, Difficulty).

Step 2

(Optional) Add your weight for precision.

Step 3

Get your result and hit the trail prepared.

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Trail Wisdom: 3 Hydration Rules We Live By

Get Your Number in Three Steps

01
The "Plus 0.5L" Rule

Always add half a liter to your calculated number. This is your emergency buffer for delays, wrong turns, or helping a fellow hiker in need.

02
Electrolytes Matter

If your hike is over 2 hours or in high heat, plain water isn’t enough. Pack electrolyte tablets or powders to prevent hyponatremia (water intoxication).

03
Sip, Don't Chug

Your body absorbs water better if you take small, frequent sips every 15-20 minutes rather than chugging a liter at a rest stop.

Frequently Asked Questions.

Altitude increases your respiratory water loss. While our calculator focuses on temp and exertion, we recommend adding an extra 10-20% to your result for any hike above 8,000 feet.

Absolutely. If you select “Difficult” intensity, the formula adjusts for the higher exertion rate of running.

If you’re using standard 1-liter smartwater bottles (popular for hiking), that’s 3 bottles. If you’re using a 32oz Nalgene, that’s roughly 3 bottles as well (since 32oz is just under 1 liter).