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Visibility Reduction Fog Calculator
Estimate visibility in fog from the extinction coefficient using Koschmieder law.
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Visibility
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Estimate visibility in fog from the extinction coefficient using Koschmieder law.
Visibility Reduction Fog Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Visibility = ln(1 / contrast threshold) / extinction coefficient.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Visibility Quick Guide
Typical values for reference.
| Extinction | Visibility | Category | Spare |
|---|---|---|---|
| 0.5 /km | 7824 m | Clear | – |
| 1.5 /km | 2608 m | Clear | – |
| 3 /km | 1304 m | Mist | – |
| 15 /km | 261 m | Fog | – |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Visibility Reduction Fog Calculator FAQ
Answers to common questions about this calculator.
It links visibility to the extinction coefficient of the air.
Visibility under 50 metres.
Droplets scatter light.
One that lets you stop within the distance you can see.