Water Needed
1.7 L
Ounces
57 oz
Per Hour
0.4 L
Total Water Needed
1.7 L
57 fl oz
Per Hour
0.4 L
Bottles
4
Bladder Fills
0.8
Inputs
Result
0.5 × (170/150) × 0.75 × 1.0 × 4 = 2.3 L.
Inputs
Result
0.5 × 1.0 × 1.0 × 1.6 × 6 = 4.8 L.
The standard recommendation is 0.5 liters (17 oz) per hour for moderate conditions. Hot weather or strenuous hiking can double that to 1 liter per hour.
| Condition | Per Hour | 4-Hour Hike | Container |
|---|---|---|---|
| Cool/easy | 0.4 L | 1.6 L | 2L bladder |
| Moderate | 0.6 L | 2.4 L | 3L bladder |
| Hot/hard | 1.0 L | 4.0 L | Bladder + bottles |
Yes. Larger hikers sweat more and need proportionally more water. A 200-lb hiker needs about 33% more water than a 150-lb hiker under the same conditions.
Hot weather dramatically increases water needs. Hiking in 90°F heat requires 60% more water than a mild 60°F day due to increased sweating.
Early signs include dark urine, headache, dizziness, and fatigue. By the time you feel thirsty, you may already be mildly dehydrated.
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Last Updated: Mar 20, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.