Secchi depth to nephelometric turbidity units
Type a value in cm to get it in NTU instantly.
30.29NTU
That's 6.1× as cloudy as the drinking water limit, while a river after rain is 1.65× cloudier. That is visibly cloudy.
Convert the other way: NTU to cm
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 cm to NTU
NTU, FNU and FTU are the same scale; a JTU is about 19 NTU. Secchi depth follows the empirical cm ≈ 244 ÷ NTU^1.14, which is a correlation rather than a conversion.
Example: 5 cm = 30.2882 NTU.
Every unit
Your turbidity in every unit
Tables
cm to NTU conversion table
| cm | NTU |
|---|---|
| 0.1 cm | 936.693 NTU |
| 0.3 cm | 357.33 NTU |
| 1 cm | 124.281 NTU |
| 4 cm | 36.8368 NTU |
| 5 cm | 30.2882 NTU |
| 10 cm | 16.4897 NTU |
| 50 cm | 4.01865 NTU |
| 100 cm | 2.18786 NTU |
| 500 cm | 0.533196 NTU |
| 1,000 cm | 0.290286 NTU |
| 4,000 cm | 0.0860405 NTU |
NTU to cm conversion table
| NTU | cm |
|---|---|
| 0.1 NTU | 3,369.93 cm |
| 0.3 NTU | 963.17 cm |
| 1 NTU | 244.13 cm |
| 4 NTU | 50.2658 cm |
| 5 NTU | 38.9758 cm |
| 10 NTU | 17.6857 cm |
| 50 NTU | 2.82355 cm |
| 100 NTU | 1.28121 cm |
| 500 NTU | 0.204548 cm |
| 1,000 NTU | 0.0928156 cm |
| 4,000 NTU | 0.0191105 cm |
Quick answers
Quick answers
- How many NTU is 1 cm?
- 1 cm is 124.281 NTU.
- How many NTU is 10 cm?
- 10 cm is 16.4897 NTU.
- How many NTU is 5 cm?
- 5 cm is 30.2882 NTU.
The units
About these units
Secchi depth (cm)
How deep a white disc stays visible.
Nephelometric turbidity units (NTU)
The standard, measured by scattering at 90 degrees.
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