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Earth Curvature Calculator
How much a distant object is hidden by the curvature of the Earth.
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Curvature drop at this distance
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How much a distant object is hidden by the curvature of the Earth.
Earth Curvature Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Drop = d2 / (2R).
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
Earth Quick Guide
Typical values for reference.
| Distance km | Eye height m | Drop | |
|---|---|---|---|
| 20 | 1.7 | 31.4 m | |
| 5 | 1.7 | 2.0 m | |
| 50 | 10 | 196.2 m | |
| 100 | 30 | 784.8 m | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Earth Curvature Calculator FAQ
Answers to common questions about this calculator.
About 8 inches per mile squared, in simple terms.
Drop = distance squared over twice the Earth radius.
Yes, light bends slightly.
It is a simple model.