Water Intake in Hot Climate: The Extra 500ml You Need
Estimate how much water you should drink a day from your weight, exercise and climate — in liters, milliliters and 250 ml glasses, right in your browser.
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Result
About this tool
This page opens the water intake calculator with a 70 kilogram body weight, no added exercise, and the climate set to hot — isolating the climate adjustment so you can see exactly what it changes.
Hot or humid conditions increase fluid loss through sweat even without exercise, so the calculator adds a flat 500 ml on top of the baseline: 2.45 liters becomes about 2.95 liters, or roughly 12 glasses of 250 ml. It is a smaller jump than an hour of exercise, but it applies every single day you spend in that climate, which adds up over a season.
70 kg is used here as a round, easy-to-follow example weight — the climate bump scales the same way regardless of body size. Enter your own weight to see your personal target for a hot climate, and stack it with real exercise minutes if you are also active outdoors.
Example. A weight of 60 kg with no exercise and a temperate climate returns 2100 ml, 2.1 L, and 9 glasses of 250 ml.
Limit. Weight must be from 20 to 300 kg, exercise from 0 to 1440 minutes, and the additives are 35 ml per kg, 350 ml per 30 minutes, and 500 ml in a hot climate.