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How Much Water To Drink A Day Calculator

How Much Water To Drink A Day Calculator uses a teaching rule: kilograms × 0.033 litres, then ×1 for light activity, ×1.2 for moderate, and ×1.4 for high. Seventy kilograms is about 2.31 litres before activity, and about 2.77 litres at the moderate setting. Food and tea also contain water. The page does not subtract them.

How Much Water To Drink A Day Calculator uses a teaching rule: kilograms × 0.033 litres, then ×1 for light activity, ×1.2 for moderate, and ×1.4 for high. Seventy kilograms is about 2.31 litres before activity, and about 2.77 litres at the moderate setting. Food and tea also contain water. The page does not subtract them.

Reviewed 2026-11-08. The result is an educational estimate, not professional advice.

Enter your values

This calculation stays in your browser. Nothing is sent when you press Calculate.

Result

Enter values to calculate.

Formula

Daily water (liters) = weight (kg) × 0.033

Example

70 kg person should aim for about 2.3 liters/day as a general estimate.

Illustration for the Water Intake Calculator used by CalculatorX.
Illustration only. Use the formula and the result box for the number.

How to use How Much Water To Drink A Day Calculator

Weight is in kilograms. Choose the activity that looks like an ordinary day, not your hardest day, unless that is the question.

The formula that actually runs is: Daily water (liters) = weight (kg) × 0.033

70 kg person should aim for about 2.3 liters/day as a general estimate.

Where this estimate stops

People told to limit fluids should follow that personal advice. More water is not automatically safer.

The calculation stays in your browser. CalculatorX does not save the numbers as an account.

If you need a different figure, look at Water Intake Calculator, Water Intake Calculator.

How to use this calculator

  1. Start with the numbers you already have. Weight is in kilograms. Choose the activity that looks like an ordinary day, not your hardest day, unless that is the question.
  2. Press Calculate. The result uses only the fields on this form and the formula printed under it.
  3. Read the limit. People told to limit fluids should follow that personal advice. More water is not automatically safer.

Questions about How Much Water To Drink A Day Calculator

How does How Much Water To Drink A Day Calculator get its result?

Weight is in kilograms. Choose the activity that looks like an ordinary day, not your hardest day, unless that is the question.

What formula is on the how much water to drink a day calculator page?

Daily water (liters) = weight (kg) × 0.033

Can I trust “how much water to drink a day calculator” as a final decision?

People told to limit fluids should follow that personal advice. More water is not automatically safer.

Is this stored or sent anywhere?

No. The page calculates in your browser and does not create an account.

What this helps you do

  • Estimate How Much Water To Drink A Day from the inputs you already have.
  • Check the result against the formula and the worked example.
  • Change one value at a time and compare the new estimate.

Limits to keep in mind

  • The figure is only as complete as the inputs on this form.
  • Rounding, fees, and local rules can change the real-world number.
  • Use it to learn and compare. Confirm important finance or health decisions with a qualified professional.