#1447 · Health Tool

Weekly Hydration Calculator

Compare your actual weekly water intake with an exercise-adjusted estimate based on body weight and training days.

Calculator

Hydration inputs
kg
L/day
days
L
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How to use this calculator

  • Enter body weight in kilograms.
  • Enter average daily water intake.
  • Add workout days and extra water per workout day.
  • Calculate to compare actual intake with estimated need.

What the result means

The result estimates whether your weekly intake is below, near, or above a body-weight-based hydration target.

Base need = body weight × 35ml × 7. Exercise need = workout days × extra water. Achievement = actual intake ÷ total need × 100.

Hydration needs vary with climate, sweat rate, sodium intake, and health conditions.

Example calculation

For 70kg, 2L/day, 4 workout days, and 0.5L extra, estimated need is 19.15L and actual intake is 14L.

Tips for better results

  • Spread intake throughout the day.
  • Add water around workouts.
  • Consider electrolytes during heavy sweating.
  • Avoid excessive intake far above need.

FAQ

How much water should I drink in a week based on body weight?

A simple estimate is body weight in kg multiplied by 35ml and seven days.

Should workout days increase my weekly water target?

Yes. Exercise increases fluid loss, especially with sweating.

How do I calculate my hydration achievement rate?

Divide actual weekly intake by estimated weekly need and multiply by 100.

Is drinking too much water a problem?

Excessive intake can be risky, especially if electrolytes are not balanced.

Why is my hydration score low even if I drink daily water?

Your intake may be below your body-weight-based or workout-adjusted need.

Hydration metrics

MetricMeaning
Estimated needBody-weight-based weekly water target.
Actual intakeAverage daily intake multiplied by seven.
AchievementActual intake divided by estimated need.

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