Example 1
- 70 kg
- 30 ml/kg
2100 ml
How many ml at 70 kg and 30 ml/kg? 2100 ml. Product only, no training add-on.
Water and weight
Type weight and ml per kg. 70 × 30 give 2100 ml. 80 × 33 give 2640 ml. 60 × 35 give 2100 ml. The calculator multiplies and rounds millilitres. This is not 33 ml plus training from the water card.
Not a clinic verdict. The result is ml = kg × ml/kg. You type the factor. The water card uses a fixed 33 and an effort add-on.
Results
Enter data and click Calculate.
How it works
Water and weight in this calculator is mass in kg times a ml-per-kg factor. 70 × 30 = 2100. The script rounds to an integer. Without Format the result is 2100 ml. 80 × 33 = 2640 ml. 60 × 35 = 2100 ml, the same 2100 from another pair.
Field a is weight. Field b is ml per kg, not a fixed 33. 30, 33, or 35 stay what you type. The calculator does not add 350 ml for training.
The water card at 70 kg with no add-on computes 70 × 33 = 2310 ml. Here 70 × 30 stays 2100 ml because the factor is 30. Hydration in glasses divides those millilitres by 250.
With a US header, weight is pounds and field b is ml per lb. The 2100 ml and 2640 ml examples are from kilograms and ml/kg. Format.volume can print litres at 2100 ml; extras keep 2100 ml after rounding.
Type weight, type ml per kg, then Calculate. Zero in a field leaves a blank. A comma in 30.5 parses. A fluid sketch, not a clinic order.
70 kg × 30 give 2100 ml. 80 × 33 give 2640 ml. 60 × 35 give 2100 ml. Two different inputs can land on the same 2100 ml.
Formula
ml = kg × ml/kg
How to use
- Type weight and ml per kg, for example 70 and 30.
- Type ml per kg, for example 30.
- Click Calculate. The result is 2100 ml.
- 80 and 33 give 2640 ml. 60 and 35 give 2100 ml.
- 33 ml/kg with an effort add-on lives on the water card.
70 kg × 30 = 2100 ml
ml = kg × ml/kg. 70 and 30 give 2100 ml. 60 and 35 again give 2100 ml.
- water
- Mass times the factor. 70 × 30 shows 2100 ml. Not the fixed 33 from the water card.
- weight
- Field a in kg. 80 kg and 33 give 2640 ml.
- fluid
- The rounded millilitre result. 60 × 35 is 2100 ml. A fluid sketch, not an order.
Examples
Example 2
- 80 kg
- 33 ml/kg
2640 ml
How many ml at 80 kg and 33 ml/kg? 2640 ml.
Example 3
- 60 kg
- 35 ml/kg
2100 ml
How many ml at 60 kg and 35 ml/kg? 2100 ml. The same 2100, another pair.
Related calculators
Common questions
How many ml at 70 kg and 30 ml/kg?
2100 ml. 70 × 30, then rounding and an ml suffix.
What about 80 kg and 33?
2640 ml. 80 × 33 = 2640.
What about 60 kg and 35?
2100 ml. Another pair, the same 2100.
Does the calculator add training?
No. The product only. 350 ml for a session lives on hydration during exercise.
How is this different from the water card?
There a fixed 33 and an add-on. Here you type ml/kg. 70 × 30 is 2100, not 2310.
Is 2100 ml an order?
No. A sketch from a product. Not a clinic verdict.
What if weight is 0?
A blank. Mass and the factor must be positive.
Does a comma in 30.5 work?
Yes. 70 × 30.5 gives 2135 ml.
Does a US header change 70 × 30?
Yes. Then 70 is pounds and 30 is ml/lb. The 2100 ml examples are metric.
Knowledge sources
The result is ml = kg × ml/kg. You type the factor.
Page updated in 2026.