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Water Intake Calculator

Estimate how much water to drink each day based on your weight and activity.

Inputs

kg
kg

minutes
minutes

Saved Scenarios

— select 2+ to compare

Daily Water Intake

2.66 L

Spark says

How it's calculated

Formula

Water=(Weight×0.033)+(⌊Exercise30⌋×0.35)Water = (Weight \times 0.033) + \left(\left\lfloor\dfrac{Exercise}{30}\right\rfloor \times 0.35\right)
Weight
— Body weight in kilograms
Exercise
— Minutes of exercise per day

What is the Water Intake Calculator?

This calculator uses a common hydration heuristic — roughly 33ml of water per kilogram of body weight, plus extra for exercise — to estimate a daily water target.

How to use it

  1. 1 Enter your body weight.
  2. 2 Enter how many minutes you typically exercise per day.

Worked examples

70kg, 30 minutes of exercise

About 2.66 litres a day.

Try it

Limitations

  • •A general guideline, not medical advice — climate, health conditions and diet all affect real needs.

Tips

  • 💡 Food also contributes to hydration — this estimate is for water and other fluids specifically.

Frequently asked questions

Does coffee or tea count toward water intake?

Yes, in moderation — despite the mild diuretic effect of caffeine, tea and coffee still contribute net fluid intake.

Sources & references