Enter the amount of sodium (mg) and the amount of water (L) into the Sodium to Water Ratio Calculator. The calculator will evaluate and display the Sodium to Water Ratio. 

Sodium to Water Ratio Formula

The following formula is used to calculate the Sodium to Water Ratio. 

STW = S / W

  • Where STW is the Sodium to Water Ratio (mg/L)
  • S is the amount of sodium (mg) 
  • W is the amount of water (L) 

How to Calculate Sodium to Water Ratio?

The following example problems outline how to calculate Sodium to Water Ratio.

Example Problem #1:

  1. First, determine the amount of sodium (mg). 
    • The amount of sodium (mg) is given as: 500.
  2. Next, determine the amount of water (L). 
    • The amount of water (L) is provided as: 3.
  3. Finally, calculate the Sodium to Water Ratio using the equation above: 

STW = S / W

The values given above are inserted into the equation below and the solution is calculated:

STW = 500 / 3 = 166.67 (mg/L)


Example Problem #2: 

For this problem, the variables required are provided below:

amount of sodium (mg) = 600

amount of water (L) = 2

Test your knowledge using the equation and check your answer with the calculator above.

STW = S / W = ?