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Water Intake Calculator

Estimate daily water intake based on body weight and exercise duration.

About this calculator

The Water Intake Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to estimate daily water intake based on body weight and exercise duration. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.

Formula used

ml/day = weight × 35 + (exercise_minutes × 12)

What you'll need

  • Weight (kg) (e.g. 70)
  • Exercise (minutes/day) (e.g. 30)

What you'll get

  • Daily Water (ml)
  • Daily Water (L)
  • Glasses (250 ml)
Formula
ml/day = weight × 35 + (exercise_minutes × 12)

Frequently Asked Questions

Is 8 glasses a day universal? +

No — needs vary by body size, climate, and activity. Use thirst and pale-yellow urine as practical signals.

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