Water & Nutrition Calculator
Estimate how much water, electrolytes and food to carry for the day.
Runs in your browser. Results are estimates to help you plan — always check current conditions and your own limits.
Estimate water, electrolytes & calories for your hike.
A practical starting point — always adjust to your body and conditions.
For educational use only — not medical advice. Listen to your body, hike within your limits and consult a clinician for health questions.
Guides that go with this tool
How Much Water Should You Bring Hiking?
A practical formula for hiking water — by hour, body weight, climate and elevation. Plus when to filter, when to carry extra,…
Hiking Food: What to Pack for Day, Overnight & Multi-Day Trips
Hiking food guide — calorie targets, real packing examples, snacks, meals, weight-to-calorie ratios for day hikes through multi-day trips.
Hiking Hydration Systems: Bladders vs Bottles vs Filters
Hiking hydration systems compared — bladders, bottles, filters and combinations. When each works best and how to pick for your trip.