15.5 % to ppm

15.5 % = 155,000 ppm

%ppm
12.5 %125,000
13.5 %135,000
14.5 %145,000
15.5155,000
16.5 %165,000
17.5 %175,000
18.5 %185,000

15.5 % = 155,000 ppm

Formula

1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm