# Calculator for Kepler's 3rd law

Calculates the square of the ratio of the orbital periods and the cube of the ratio of the semimajor axes of two planets and compares them with each other.
The formula for Kepler's 3rd law is _{1}/T_{2})²=(a_{1}/a_{2})³

Please enter three or four values or select planets, the fourth value and the two ratios will be calculated. The more distant planet should be selected first, otherwise the ratio may become 0 by rounding. Due to the very large numbers in this calculation, the ratios are only approximately the same.

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