Question 1

What is 1,390 ppm in PSU?

Accepted Answer

1,390 ppm = 1.397 PSU. Use the converter on this page to convert to other salinity / tds units instantly.

Question 2

How do you convert ppm to PSU?

Accepted Answer

Formula: 1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation). Multiply your ppm value by the appropriate factor to get PSU, or use the interactive converter above.

Question 3

What is 1.397 PSU in ppm?

Accepted Answer

1.397 PSU = 1,390.2 ppm.

ppm	PSU
1,375 ppm	1.382
1,380 ppm	1.387
1,385 ppm	1.392
1,390	1.397
1,395 ppm	1.402
1,400 ppm	1.407
1,405 ppm	1.412

1,390 ppm to PSU

Formula