Daily Water Intake Calculator

Calculate your personalized daily hydration requirement based on body mass, sweat rate, daily physical activity, and climate.

BMR
1,659 kcal
Calories at total rest
Maintenance (TDEE)
2,571 kcal
Calories to stay the same weight
Your target
2,571 kcal/day
Adjusted for your goal
SUGGESTED DAILY MACROS
Protein20%
126g
Fat25%
71g
Carbs55%
356g

Estimates only — individual metabolism varies. Consult a doctor or registered dietitian before making major dietary changes.

Today's Food Log

Search foods, select unit (grams, slices, pieces, cups, oz...), and track your daily macros.

TOOLS THAT MAKE HITTING YOUR TARGET EASIER
Meal prep containers
Portion-controlled sets that make hitting your target calories easier.
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Kitchen food scale
Accurate gram measurements — the single biggest upgrade for calorie tracking.
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Whey / plant protein powder
A fast way to hit your daily protein target from the macros below.
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⚕️MEDICAL & YMYL DISCLAIMERReviewed August 2026

Educational Purpose Only: The calculations, formulas, and estimates provided by this calorie & nutrition calculator are intended solely for educational, research, and informational purposes. They do not constitute medical advice, diagnosis, or personalized treatment plans.

Always consult a qualified healthcare professional, physician, or registered dietitian before making changes to your diet, exercise regimen, calorie intake, or pregnancy care plan. Never disregard or delay professional medical advice because of something you read on this website.

SCIENTIFIC FORMULA & METHODOLOGY
Clinical Hydration Baseline Formula
Baseline Intake = Weight (kg) × 35 mL  (or Weight in lbs ÷ 2 in oz)
Exercise Add-on: +350-500 mL per 30 minutes of vigorous workout

Standard physiological guidelines recommend approximately 30-35 mL of water per kilogram of body weight, plus additional fluids for sweat loss during training.

Clinical Limitations & Considerations

Individuals with kidney conditions or heart failure should follow personalized fluid restrictions prescribed by their physician.

Scientific References & Literature

  • Sawka, M. N., et al. (2007). "American College of Sports Medicine position stand. Exercise and fluid replacement." Medicine & Science in Sports & Exercise, 39(2), 377-390.

Frequently Asked Questions

How many glasses of water should I drink per day?

While "8 glasses a day" (64 oz / ~2 L) is a common rule of thumb, most active adults require 2.5 to 3.7 liters (85–125 oz) from all fluids and food.