330 ppb to ppm

330 ppb = 0.33 ppm

ppbppm
315 ppb0.315
320 ppb0.32
325 ppb0.325
3300.33
335 ppb0.335
340 ppb0.34
345 ppb0.345

330 ppb = 0.33 ppm

Formula

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