Hiking Water Calculator
Estimate how much drinking water to carry on a hike from your hours on the trail and the conditions. It starts at half a liter per hour and scales up for heat and effort.
How to estimate hiking water
- Enter how many hours you will be hiking.
- Pick the conditions: mild, hot or strenuous.
- Or set your own drinking rate in liters per hour.
- Read the total water to carry in liters and ounces.
Examples
Six hour hike in mild weather
hours 6, conditions mild
0.5 L per hour, 3 liters, 101.44 oz
Frequently asked questions
How much water do I need per hour of hiking?
About half a liter per hour is a common baseline in mild weather. Hot or strenuous days can push that to three quarters of a liter or more.
Is this a precise medical recommendation?
No. It is a planning guideline only. Real needs vary with heat, altitude, body size, effort, diet and how much you sweat.
What counts as hot or strenuous?
Hot means high temperatures or strong sun. Strenuous means steep, fast or heavily loaded hiking. Both raise how fast you lose fluids.
Should I also carry electrolytes?
On long, hot or sweaty hikes, yes. Plain water alone can leave you low on sodium. Electrolyte mixes or salty snacks help you stay balanced.
Can I refill on the trail instead of carrying it all?
Often yes, if reliable water sources exist. Always treat or filter wild water, and carry enough to reach the next safe refill point.
Related tools
Hiking Time Calculator
Estimate how long a hike will take with Naismith's rule. Enter distance, elevation gain and pace to get total walking time in hours and minutes.
Trail Calorie Calculator
Estimate calories burned hiking using MET values. Enter your weight, hours and effort to see kilocalories burned on the trail. Free and private.
Backpack Weight Calculator
Find a recommended maximum pack weight from your body weight. See your pack as a percent of body weight and whether it sits within the limit.
Pace Count Calculator
Convert between distance and paces for land navigation. Enter your pace count per 100 m to find total paces for a distance, or distance from paces.
Sleeping Bag Rating Calculator
Find a recommended sleeping bag temperature rating from the expected overnight low. Adds a safety margin based on whether you sleep warm or cold.