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VLOS Distance Calculator
Compute line-of-sight distance to the horizon between two heights above ground.
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LOS distance
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Compute line-of-sight distance to the horizon between two heights above ground.
VLOS Distance Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: d (km) = 3.57 x (sqrt(h1) + sqrt(h2)) x sqrt(k), heights in metres.
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
VLOS Quick Guide
Typical values for reference.
| h1 m | h2 m | k | Distance km |
|---|---|---|---|
| 2 | 2 | 1.33 | 11.6 km |
| 10 | 2 | 1.33 | 18.8 km |
| 30 | 10 | 1.33 | 35.6 km |
| 100 | 30 | 1.33 | 63.7 km |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
VLOS Distance Calculator FAQ
Answers to common questions about this calculator.
The straight path between two points without obstruction from the Earth curve.
Radio waves bend slightly with the atmosphere.
Yes, hills and buildings block paths.
About 4.12 sqrt(h) km for antennas.