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Home›Health & Fitness›Water Intake Calculator

Water Intake Calculator

Daily hydration requirement

Quick Answer — Water Intake

The Water Intake Calculator is a free online health & fitness tool that helps you daily hydration requirement. Enter your values above for instant, accurate results — no signup required. All calculations run privately in your browser.

Standard Formula Updated 2026
kg
70kg
20kg200kg
Methodology
Free forever Data stays on your device Works offline (PWA) Verified formulas

Maintained by: Sagar Sahni, Calc Labz  |  Review: formula checks, worked examples, and periodic updates

Use with care: Health outputs are informational estimates only and do not replace medical advice.

Need a correction? Contact us with the calculator name and the issue you found.

Formula & Worked Example

The math behind the Water Intake Calculator

Mathematical Formula

Daily\\;Water = Weight \\times Activity\\;Factor
Activity Factors: - Sedentary = 30ml/kg, Moderate = 35ml/kg, Active = 40ml/kg, Very Active = 45ml/kg - IOM: Men ~3.7L/day, Women ~2.7L/day (including food) - ~20% from food, increase 500ml+ during exercise/heat

Step-by-Step Worked Example

**70 kg, moderately active**: - 70 × 35 = **2,450 ml** (2.45 L) - Glasses (250ml): **10 glasses** - Hourly: 2,450 / 16 waking hrs = **153 ml/hour**

Frequently Asked Questions

Common questions about the Water Intake Calculator

What is the Water Intake Calculator?
The Water Intake Calculator is a free online tool designed to calculate daily hydration requirement instantly, securely, and accurately without any signups or registration.
How do I use the Water Intake Calculator?
Simply fill in the fields (like Weight) in the form above. The calculator will automatically perform the calculations and show the main and secondary outputs in real-time.
Is my personal data saved when using this calculator?
No. Calc Labz is a client-side progressive web application. All calculations are performed in your browser's runtime. We do not transmit or save any of your inputs on our servers, ensuring 100% data privacy.
Can I use the Water Intake Calculator on my mobile phone?
Yes. The Water Intake Calculator is fully responsive and works on all devices — desktop, tablet, and mobile. You can also install Calc Labz as a Progressive Web App (PWA) for instant access and offline use, even without an internet connection.
How accurate is the Water Intake Calculator?
Our Water Intake Calculator uses verified, standard health formulas that are regularly reviewed and updated for accuracy. Results are intended for informational and planning purposes — for critical decisions, we recommend consulting a qualified professional.

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What is the Water Intake Calculator?

The Water Intake Calculator is a free online health & fitness tool that helps you daily hydration requirement. Built for accuracy and speed, this calculator uses verified formulas and provides instant results without requiring any signup or registration. All calculations run entirely in your browser, ensuring complete privacy — no personal data is ever sent to our servers.

How to Use the Water Intake Calculator

  1. Enter Weight: Enter your weight (in kg) in the input field. The calculator will validate your input automatically.
  2. View Your Results: The Water Intake Calculator displays your results instantly in the output panel. You will see the primary result along with a detailed breakdown of secondary outputs. Scroll down for charts, interpretations, and expert advice.

Key Features

  • Instant Water Intake calculations with real-time updates
  • No signup, no registration — 100% free forever
  • All calculations happen in your browser — zero data sent to servers
  • Works offline as a Progressive Web App (PWA)
  • Mobile-friendly responsive design
  • Verified health & fitness formulas updated for 2026

Why Use Calc Labz Water Intake Calculator?

The Calc Labz Water Intake Calculator stands out because it combines accuracy with simplicity. Unlike other online calculators, we provide detailed breakdowns, step-by-step formulas, and actionable advice alongside your results. Our health & fitness calculators are regularly updated to reflect current rates, rules, and standards for India (2026). Whether you are a student, professional, or just need a quick calculation — Calc Labz delivers reliable results instantly.

Key Terms & Glossary

BMI
Body Mass Index — a screening tool that estimates body fat using weight and height (kg/m²).
BMR
Basal Metabolic Rate — the number of calories your body burns at complete rest to maintain vital functions.
TDEE
Total Daily Energy Expenditure — total calories burned per day including BMR, activity, and thermic effect of food.
Macros
Macronutrients: protein, carbohydrates, and fats — the three main nutrients that provide energy (calories).
Caloric Deficit
Consuming fewer calories than your TDEE, causing your body to use stored fat for energy, leading to weight loss.
Body Fat %
The percentage of your total body weight that is composed of fat tissue, as opposed to lean mass.