Nephelometric turbidity units to formazin nephelometric units
Type a value in NTU to get it in FNU instantly.
5FNU
That's about the same as the drinking water limit. That is visibly cloudy.
What it means
How cloudy is it?
Suspended solids and Secchi depth are correlations, not conversions: the same NTU from fine clay and from algae gives quite different figures.
The math
How to convert NTU to FNU
To convert nephelometric turbidity units to formazin nephelometric units, multiply by 1.
Example: 5 NTU × 1 = 5 FNU.
In the other direction, 1 FNU = 1 NTU.
Every unit
Your turbidity in every unit
Tables
NTU to FNU conversion table
| NTU | FNU |
|---|---|
| 0.1 NTU | 0.1 FNU |
| 0.3 NTU | 0.3 FNU |
| 1 NTU | 1 FNU |
| 4 NTU | 4 FNU |
| 5 NTU | 5 FNU |
| 10 NTU | 10 FNU |
| 50 NTU | 50 FNU |
| 100 NTU | 100 FNU |
| 500 NTU | 500 FNU |
| 1,000 NTU | 1,000 FNU |
| 4,000 NTU | 4,000 FNU |
FNU to NTU conversion table
| FNU | NTU |
|---|---|
| 0.1 FNU | 0.1 NTU |
| 0.3 FNU | 0.3 NTU |
| 1 FNU | 1 NTU |
| 4 FNU | 4 NTU |
| 5 FNU | 5 NTU |
| 10 FNU | 10 NTU |
| 50 FNU | 50 NTU |
| 100 FNU | 100 NTU |
| 500 FNU | 500 NTU |
| 1,000 FNU | 1,000 NTU |
| 4,000 FNU | 4,000 NTU |
Quick answers
Quick answers
- How many FNU is 1 NTU?
- 1 NTU is 1 FNU.
- How many FNU is 10 NTU?
- 10 NTU is 10 FNU.
- How many FNU is 5 NTU?
- 5 NTU is 5 FNU.
The units
About these units
Nephelometric turbidity units (NTU)
The standard, measured by scattering at 90 degrees.
Formazin nephelometric units (FNU)
The same measurement with an infrared source, as ISO specifies.
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