Daily Water Intake Calculator
How much to drink for your weight, climate and training.
Enter your values
Enter the body weight in lb.
Enter the exercise in minutes/day.
Choose one of: Temperate, Hot or humid, Cold.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Daily water target
- 106 oz
- In litres
- 3.13 L
- Standard 16 oz bottles
- 6.6
- 8 oz glasses
- 13.3
Quick answer
A common baseline is half your body weight in ounces of water per day, plus 12–16 oz for every 30 minutes of exercise.
At a glance
| What it does | How much to drink for your weight, climate and training. |
|---|---|
| Category | Health |
| Inputs needed | Body weight, Exercise, Climate |
| Main output | Daily water target |
| Cost | Free — no sign-up, no download |
How to use the Daily Water Intake Calculator
- 1Enter your body weight.
- 2Add daily exercise minutes.
- 3Pick your climate to adjust the target.
Inputs explained
- Body weight(lb)
- Enter the body weight in lb.
- Exercise(minutes/day)
- Enter the exercise in minutes/day.
- Climate
- Choose one of: Temperate, Hot or humid, Cold.
Worked example
Using the values the calculator loads with:
Inputs
- Body weight170 lb
- Exercise45 minutes/day
- ClimateTemperate
Results
- Daily water target106 oz
- In litres3.13 L
- Standard 16 oz bottles6.6
- 8 oz glasses13.3
Frequently asked questions
Do coffee and tea count?
Yes. Caffeinated drinks are mildly diuretic but still contribute net fluid to your daily total.
How do I know I'm hydrated?
Pale straw-coloured urine and infrequent thirst are the simplest day-to-day indicators.
What do I need to enter into the Daily Water Intake Calculator?
Just 3 values: body weight, exercise, climate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Daily Water Intake Calculator work out the answer?
A common baseline is half your body weight in ounces of water per day, plus 12–16 oz for every 30 minutes of exercise. The working is shown step by step so you can verify the result by hand.
Is the Daily Water Intake Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.