The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the first example the result is 2.6 L.
The calculator is not a fluid order and does not replace thirst or a scale. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters.
Enter data and click Calculate.
The calculator uses the numbers you enter. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the first example the result is 2.6 L.
The five form fields are Sweaty training time per day, Ambient temperature, Estimated relative humidity, Salty / ultra-processed meals, and Urine color / mouth dryness proxy. Liter estimate means: This is the main result on this page. In the first example it is 2.6 L. Sweaty training time per day means: The first form field. It enters the formula or sits beside the result. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. Ambient temperature means: The second form field. The calculator is not a fluid order and does not replace thirst or a scale.
The second example gives 3.5 L. The third example gives 2.0 L. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the first example the result is 2.6 L.
The calculator is not a fluid order and does not replace thirst or a scale.
Enter 45, 24, 55, 4, 3, then click Calculate. A comma in 12.5 is read the same way as a period. Fields on a 0-10 scale are notes and are not the primary result unless this page formula says so.
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters.
In the first example the result is 2.6 L. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters.
2.6 L
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the first example the result is 2.6 L.
3.5 L
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the second example the result is 3.5 L.
2.0 L
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. In the third example the result is 2.0 L.
In the first example the result is 2.6 L. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters.
With the second set of fields the result is 3.5 L.
With the third set of fields the result is 2.0 L.
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters.
The calculator is not a fluid order and does not replace thirst or a scale.
This is the main result on this page. In the first example it is 2.6 L. The first form field. It enters the formula or sits beside the result. The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. The second form field. The calculator is not a fluid order and does not replace thirst or a scale.
Yes. 12.5 and 12,5 are read the same way.
No. Fields on a 0-10 scale are notes, unless this page formula counts marked items from them. The primary result comes from this page formula.
A 2 L base, then 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%.
No. The calculator does not replace thirst or a scale. Salt and urine notes do not change the liters.
Degrees below 22 do not add 0.04 L. The 2 L base stays, and sweat and humidity can still add liters.
Hours of sweaty effort. Temperature in Celsius, humidity in percent.
It is the base on this page, not a medical order and not a norm for every body mass.
The estimate starts at 2 L, then adds 0.6 L per sweaty hour, 0.04 L per degree above 22 °C, and 0.01 L per humidity point above 50%. Salt and urine notes do not change the liters. The calculator is not a fluid order and does not replace thirst or a scale.
Page updated in 2026.
