Enter the total grams of dissolved salts and the total grams of seawater into the calculator to determine the salinity.

## Salinity Formula

The following formula is used to calculate a salinity in ppt.

S = MS / MSW *1000

- Where S is the salinity (grams of salt per 1000 grams of seawater) (ppt)
- MS is the mass of the salts (grams)
- MSW is the mass of the salt water (grams)

## Salinity Definition

**What is salinity? **

Salinity is defined as the amount of salt, in mass, in a given unit of water. The water is often referred to as saltwater or seawater.

If there are 5 grams of salt in 1000 grams of seawater, the salinity in parts per 1000 would be 5ppt.

## Example Problem

How to calculate salinity?

**First, determine the number of grams of salt in the body of water.**This is usually done by evaporating the water and measuring the mass of salt left. For this example, the mass of the salt is 5 grams.

**Next, determine the mass of the seawater.**In this case, there were 5000 grams of seawater.

**Finally, calculate the salinity.**Using the formula above, the salinity is calculated to be:

S = MS / MSW *1000

S = 5 / 5000 *1000

S = 1 PPT

The salinity is 1 gram of salt per 1 thousand grams of seawater.