Health calculator
Water Intake Calculator
Estimate daily water intake from body weight and activity adjustment.
Formula
Water intake estimate
Hydration needs vary with climate, health, medications, diet, pregnancy, and activity.
Daily water = body weight x 35 ml, adjusted for activity
70 kg x 35 ml = 2,450 ml before activity adjustment.
FAQs
Is this medical advice?+
No. It is a general hydration estimate.
Should athletes drink more?+
Often yes, especially during heat, long workouts, or heavy sweating.
How does the Water Intake Calculator calculate the result?+
It uses the Water intake estimate: Daily water = body weight x 35 ml, adjusted for activity. 70 kg x 35 ml = 2,450 ml before activity adjustment.
What information do I need to use the Water Intake Calculator?+
Estimate daily water intake from body weight and activity adjustment.
How accurate is the Water Intake Calculator?+
Water Intake Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Water Intake Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Health guide
How to use the Water Intake Calculator
Estimate daily water intake from body weight and activity adjustment. The page also explains the water intake estimate and shows a practical example: 70 kg x 35 ml = 2,450 ml before activity adjustment.
- 1
Enter your details
Enter body weight and activity adjustment, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the water intake estimate: Daily water = body weight x 35 ml, adjusted for activity.
- 3
Compare scenarios
Change one or more inputs to see how they affect the water Intake Calculator result before you use the estimate.
Was this calculator useful?
0/1200