---
title: "Hydration Calculator - Modern Stamina"
description: "Estimate your daily water intake with the Modern Stamina Hydration Calculator based on weight, activity, and climate."
url: "https://www.modernstamina.com/calculators/hydration"
language: "en"
---

[ Back to Calculators ](/calculators)

# Hydration Calculator

Estimate your daily water intake based on your body weight, activity level, and climate.

Imperial \(lbs\) Metric \(kg\)

Current Weight \(lbs\)

Current Weight \(kg\)

Activity Level Low \(Sedentary, minimal exercise\) Moderate \(3-5 days/week of exercise\) High \(6-7 days/week or intense training\)

Climate Cool Moderate Hot

Calculate Hydration

Estimated Daily Water Target

\-- ml

Approx. \-- glasses \(250ml each\) 

## Understanding Your Estimated Result

### What this result means

This result estimates your baseline daily water intake in milliliters \(ml\) and approximate glasses to stay adequately hydrated.

### Formula used

This calculator estimates baseline hydration at 35ml per kilogram of body weight, then adds additional allowances for increased physical activity and warmer climates to account for extra fluid loss through sweat.

### Limitations of this calculation

This formula provides a general rule of thumb and does not account for total fluid intake from water-rich foods, beverages like tea or coffee, specific medical conditions affecting fluid balance, or acute fluid losses during extreme endurance events.

### Who may benefit from professional guidance

These estimates are not exact personalised prescriptions. If you have a history of heart failure, kidney disease, or are taking medications that affect fluid retention, speak with a qualified healthcare professional before making significant changes to your fluid intake.

### Related educational guides

  * [Nutrition: Fuel for daily energy](/eat)
  * [Recovery: Recharging the system](/recover)

Last reviewed: August 2026