Example 1
- 70 kg
- 33 ml/kg
9.24
How many glasses at 70 kg and 33 ml/kg? 9.24. 2310 / 250, two places.
Hydration (glasses)
Type weight and ml per kg. 70 × 33 give 9.24. 80 × 30 give 9.60. 60 × 35 give 8.40. The metric glass is 250 ml. Below 10 glasses the calculator shows two places.
Not a clinic verdict. The calculator divides millilitres by 250. Day water at 33 ml/kg lives on the water card. Here the result is glasses.
Results
Enter data and click Calculate.
How it works
Hydration (glasses) in this calculator is weight in kg times ml per kg, then over 250. 70 × 33 = 2310 ml. 2310 / 250 = 9.24. The calculator writes 9.24 because the result is below 10. 80 × 30 = 2400 ml, 9.60 glasses. 60 × 35 = 2100 ml, 8.40.
When glasses are 10 or more, the script keeps one place (one decimal place). 9.24, 9.60, and 8.40 go through two decimal places. A US glass is 240 ml. The examples use 250.
The millilitre row is an add-on. The main result is the glass count, with no word glasses in the result string. 9.24 is a bare number with two places.
The water card at 70 kg and 33 ml/kg shows 2310 ml, not glasses. Hydration during exercise uses 5 ml/kg/h for a session. Here a day in 250 ml glasses.
Type weight, type ml per kg, then Calculate. Zero in either field leaves a blank. A comma in 33.5 parses. A sketch, not a clinic drinking order.
70 kg × 33 give 9.24. 80 × 30 give 9.60. 60 × 35 give 8.40. With a US header, weight is pounds and the glass is 240 ml. Glasses follow the metric header, not US cups.
Formula
glasses = (kg × ml/kg) / 250
How to use
- Type weight and ml per kg to get 250 ml glasses.
- Type ml per kg, for example 33.
- Click Calculate. The result is 9.24.
- 80 and 30 give 9.60. 60 and 35 give 8.40.
- Millilitres for the day live on the water card. Here 250 ml glasses.
70 kg × 33 = 9.24
Glasses = (kg × ml/kg) / 250. 70 and 33 give 9.24. Below 10 the calculator shows two places.
- glasses
- The main result. 70 kg and 33 show 9.24. the result string has no unit word.
- water
- The ml product. 80 × 30 is 2400 ml, then 9.60 glasses. A day in ml lives on the water card.
- metric
- A 250 ml glass. 60 × 35 = 2100 ml, 8.40 glasses. US uses 240 ml.
Examples
Example 2
- 80 kg
- 30 ml/kg
9.60
How many glasses at 80 kg and 30 ml/kg? 9.60.
Example 3
- 60 kg
- 35 ml/kg
8.40
How many glasses at 60 kg and 35 ml/kg? 8.40.
Related calculators
Common questions
How many glasses at 70 kg and 33 ml/kg?
9.24. 70 × 33 = 2310, 2310 / 250 = 9.24, two decimal places.
What about 80 kg and 30?
9.60. 2400 / 250.
What about 60 kg and 35?
8.40. 2100 / 250.
Why two places, not one?
The code: below 10 glasses uses two decimal places. From 10 up, one decimal place.
How many ml is a glass?
250 ml in metric. 240 ml in US. The 9.24 examples use 250.
Is 9.24 a drinking order?
No. A sketch from a product. Not a clinic verdict.
How is this different from the water card?
There the result is ml. 70 kg is 2310 ml. Here that 2310 goes through 250.
What if weight is 0?
A blank. Weight and ml/kg must be positive.
Does a comma in 33.5 work?
Yes. 70 × 33.5 / 250 gives 9.38.
Knowledge sources
The calculator divides millilitres by 250. The result is glasses, not a WHO litre target.
Page updated in 2026.