calculatorsonline.co.uk
Lighthouse Visibility Distance Calculator
Distance at which a light is visible over the horizon.
wave Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Visibility distance
Compare Your Options And Get Clear Answers
Distance at which a light is visible over the horizon.
Lighthouse Visibility Distance Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: D = 2.08 (sqrt(h) + sqrt(e))
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
Lighthouse Quick Guide
Typical values for reference.
| Light height (m) | Observer eye height (m) | Spare | Visibility distance |
|---|---|---|---|
| 30 | 3 | 0 | 15.0 nautical miles |
| 60 | 5 | 0 | 20.8 nautical miles |
| 15 | 2 | 0 | 11.0 nautical miles |
| 40 | 10 | 0 | 19.7 nautical miles |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Lighthouse Visibility Distance Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
D = 2.08 (sqrt(h) + sqrt(e))
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.