Water Intake Calculator Guide: Formula & Worked Example
Short answer
How much water to drink per day. In the fixed example below, daily water is 2.66 L. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Water Intake Calculator calculation using weight, exercise per day
The inputs are weight, exercise per day. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Weight
- 70
- Exercise per day
- 30
- Daily water: 2.66 L
- Glasses (250 ml): 11
Understanding the result
How much water to drink per day. Start with the base example, then replace each value with the figure that matches your situation.
Weight
The example uses 70 kg for weight. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Exercise per day
The example uses 30 minutes for exercise per day. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The comparison changes only weight, keeping every other example input fixed. This isolates that input's effect on the primary result. It does not predict future outcomes.
This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Lower input | Weight: 56 kg | Daily water: 2.2 L |
| Base example | Weight: 70 kg | Daily water: 2.66 L |
| Higher input | Weight: 84 kg | Daily water: 3.12 L |
Common mistakes
- Using the wrong units for weight.
- Comparing results while changing more than one input at a time.
- This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.
Checklist
- Confirm weight is expressed in kg.
- Confirm exercise per day is expressed in minutes.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
This is a screening or planning estimate, not a diagnosis. Age, pregnancy, medication and individual medical history can change how the result should be interpreted.