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Earth Orbit Calculator
Orbital speed and period of a satellite at a given altitude above Earth.
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Orbital speed
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Orbital speed and period of a satellite at a given altitude above Earth.
Earth Orbit Estimator
Enter your numbers below for an instant estimate.
0
π‘ Tip: v = sqrt(GM/r); T = 2 pi r / v.
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.
| Orbit | Speed | Period | |
|---|---|---|---|
| ISS (400 km) | 7.67 km/s | 92 min | |
| Starlink (550 km) | 7.59 km/s | 96 min | |
| GPS (20,200 km) | 3.87 km/s | 718 min | |
| Geostationary (35,786 km) | 3.07 km/s | 1436 min | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Earth Orbit Calculator FAQ
Answers to common questions about this calculator.
About 7.7 km/s at 400 km.
About 35,786 km.
Gravity is weaker.
Circular orbit approximation.