Example 1
- 70 kg
- 60 min
350 ml
How many ml at 70 kg and 60 min? 350 ml. 5 ml/kg/h × 1 h.
Hydration during exercise
Type weight and training minutes. 70 kg and 60 min give 350 ml. 80 kg and 90 min give 600 ml. 60 kg and 30 min give 150 ml. The result is ml, not liters.
Not a clinic verdict. The calculator computes ml: 5 ml per kg per hour times time. The hub wrongly said liters. The code prints millilitres.
Results
Enter data and click Calculate.
How it works
Hydration during exercise in this calculator is weight in kg times 5 ml per hour, times minutes over 60. 70 × 5 × (60/60) = 350. The result is 350 ml. 80 × 5 × 1.5 = 600 ml. 60 × 5 × 0.5 = 150 ml.
The constant is 5 ml/kg/h. An hour at 70 kg is 350 ml, not 0.35 L on the result label. The script rounds millilitres and appends ml. There are no gallons in this formula.
With a US header, weight is in pounds and the calculator converts to kg before it multiplies by 5. The 350, 600, and 150 examples are from kilograms. Time is always minutes.
This is an add-on for the session, not water for the whole day. A day at 33 ml/kg lives on water requirement: 70 kg with no training is 2310 ml. Here only the session.
Type weight, type minutes, then Calculate. Zero minutes leaves a blank. A comma in 70.5 parses. Heat and illness change losses: then a doctor, not this 5.
70 kg and 60 min give 350 ml. 80 kg and 90 min give 600 ml. 60 kg and 30 min give 150 ml. A sketch, not a clinic order.
Formula
ml = weight[kg] × 5 × (minutes / 60)
How to use
- Type weight and training minutes, for example 70 kg and 60 min.
- Type training minutes, for example 60.
- Click Calculate. The result is 350 ml.
- 80 kg and 90 min give 600 ml. 60 kg and 30 min give 150 ml.
- Water for the whole day lives on water requirement. Here only the session.
70 kg and 60 min = 350 ml
ml = kg × 5 × (min/60). 70 kg and 60 min give 350 ml. This is not in liters.
- Hydration
- The session add-on. 70 kg and 60 min show 350 ml. This is not 33 ml/kg for the day.
- exercise
- Time in minutes. 90 min at 80 kg gives 600 ml. 30 min at 60 kg gives 150 ml.
- constant
- 5 ml per kg per hour. An hour at 70 kg is 350 ml, not 0.35 L on the label.
Examples
Example 2
- 80 kg
- 90 min
600 ml
How many at 80 kg and 90 min? 600 ml. An hour and a half.
Example 3
- 60 kg
- 30 min
150 ml
How many at 60 kg and 30 min? 150 ml. Half an hour.
Related calculators
Common questions
How many ml at 70 kg and 60 min?
350 ml. 70 × 5 × 1 = 350. The result is ml, not liters.
What about 80 kg and 90 min?
600 ml. 80 × 5 × 1.5 = 600.
What about 60 kg and 30 min?
150 ml. 60 × 5 × 0.5 = 150.
Is the result in liters?
No. The code rounds ml and appends ml. The hub wrongly said L and gallons.
Where does 5 ml/kg/h come from?
A constant in the script. An hour at 70 kg is 350 ml. Not 33 ml/kg from the day card.
Is this water for the whole day?
No. The session add-on only. 2310 ml at 70 kg with no training lives on the water card.
Is 350 ml an order?
No. A sketch from a product. Not a clinic verdict. Heat can differ.
What if minutes are 0?
A blank. Time must be positive.
Does a comma in 70.5 work?
Yes. 70.5 × 5 × 1 = 352.5, the calculator rounds to 353 ml.
Knowledge sources
The calculator computes ml: 5 ml per kg per hour times time. This is not lab osmolality.
Page updated in 2026.