Does tea or coffee count toward fluid intake?

Most beverages contribute fluid, but water is still the simplest default. Alcohol can increase fluid loss and should not be used for hydration planning.

Can I drink too much water?

Yes. Excessive water intake can be unsafe, especially during endurance exercise without electrolytes. Use this as a planning estimate.

Should athletes add electrolytes?

For long, intense, or very sweaty sessions, electrolytes may be useful. Needs vary by sweat rate, climate, and workout duration.

Health & Fitness

Daily Water Intake Calculator

Estimate daily fluid needs from body weight, climate, and exercise intensity with metric or imperial inputs.

Key terms

Adjust inputs

Unit system

Weight

30220

ClimateExercise intensity

Exercise duration

min

0180

Formula Explanation

Water target = weight kg x 35 ml + climate adjustment + exercise adjustment

This estimator starts with a body-weight fluid baseline, then adds extra fluid for hotter conditions and sweat-producing exercise.

Step-by-Step Example

1Convert body weight to kilograms if imperial units are selected.
2Estimate baseline hydration as 35 ml per kilogram of body weight.
3Add a climate adjustment for hot or humid environments.
4Add exercise fluid based on workout duration and intensity.

Reference

Benchmark Table

Compare common scenarios quickly. Scroll horizontally on smaller screens.

Reference 1

Weight: 50 kg
Temperate: 1.75 L
Hot climate: 2.25 L
45 min moderate exercise: 2.20 L

Reference 2

Weight: 70 kg
Temperate: 2.45 L
Hot climate: 2.95 L
45 min moderate exercise: 2.90 L

Reference 3

Weight: 90 kg
Temperate: 3.15 L
Hot climate: 3.65 L
45 min moderate exercise: 3.60 L

Weight	Temperate	Hot climate	45 min moderate exercise
50 kg	1.75 L	2.25 L	2.20 L
70 kg	2.45 L	2.95 L	2.90 L
90 kg	3.15 L	3.65 L	3.60 L

FAQ

A simple estimate is about 30 to 35 ml per kilogram of body weight, with extra fluid for heat, humidity, and exercise.

Daily fluid target

2.9 L/day

Details