Water Intake Calculator by Weight

About the Water Intake Calculator by Weight

Water Intake Calculator estimates how much water you should drink per day based on your body weight, daily exercise minutes and climate. Uses the common 33 ml-per-kg baseline with adjustments for sweat and heat.

How to use

1. Enter your weight in kilograms.
2. Enter your typical exercise minutes per day.
3. Pick your climate (cool, normal, hot) and click Calculate.

Benefits & key features

• Personalised to your body and lifestyle rather than a flat 2-litre rule.
• Accounts for sweat losses during workouts.
• Aids weight-loss efforts by reducing hunger-thirst confusion.
• Pairs naturally with the Calorie Deficit and Protein Intake tools.

Pro tip

Sip throughout the day rather than chugging. Clear-pale urine is a real-world sign of good hydration.

Why choose toolsfy for Health & Fitness tools?

A BMI calculator that harvests your email address, a TDEE estimator that upsells coaching — the health-and-fitness web is riddled with dark patterns. toolsfy's tools compute the same peer-reviewed equations (Mifflin-St Jeor for TDEE, WHO BMI bands, U.S. Navy body-fat formula) without asking for anything more than the numbers needed to run the math.

Common use cases

• Personal trainers running quick BMI and body-fat estimates for new clients during their first consultation, with nothing logged or stored.
• Home cooks planning a short calorie-deficit cycle and wanting the daily target in plain numbers rather than a vague "app score".
• Patients preparing for a doctor's appointment by converting a mg/dL blood-sugar reading into mmol/L (or vice versa) before their consult.

Frequently asked questions