Kepler's Third Law
Calculate Kepler's Third Law instantly with the exact formula and a worked example.
Kepler's Third Law
Semi-major axisAU
Period (yrs)
1
More about: Kepler's Third Law
What it calculates
The “Kepler's Third Law” calculator computes Period (yrs) from 1 parameter: semi-major axis (AU).
An astronomy calculation for enthusiasts and scientists.
Example calculation
With parameters Semi-major axis = 1 AU the result is 1.
How to use
- Enter semi-major axis — each field above is adjustable with a slider.
- Period (yrs) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Kepler's Third Law calculated?
The Kepler's Third Law calculator computes Period (yrs) from semi-major axis. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Kepler's Third Law calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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