calculatorsonline.co.uk
Kepler Third Law Calculator
Orbital period from semi-major axis using Kepler third law.
star Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Period
Compare Your Options And Get Clear Answers
Orbital period from semi-major axis using Kepler third law.
Kepler Third Law Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: T = sqrt(a^3 / M)
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
Kepler Quick Guide
Typical values for reference.
| Semi-major axis (AU) | Central mass (solar masses) | Spare | Period |
|---|---|---|---|
| 1 | 1 | 0 | 1.00 years |
| 5.2 | 1 | 0 | 11.9 years |
| 0.387 | 1 | 0 | 0.24 years |
| 30 | 1 | 0 | 164 years |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Kepler Third Law 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.
T = sqrt(a^3 / M)
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.