Planet Year Length Calculator
Result
Orbital period (Earth days)686.98
Orbital period (Earth years)1.8808873557
↗ Space
Compare the orbital year length of the eight planets.
Formula
Earth years = Orbital period in days ÷ 365.2425
- Choose a planet to see its approximate orbital period in Earth days and Earth years.
- The main inputs are Planet. Enter them in the units and format shown in the calculator.
- Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Planet Year Length
Inputs
- Planet: mars
Mars takes about 686.98 Earth days, or 1.88 Earth years, to orbit the Sun.
Sample result: Calculating…
Frequently asked questions
What does this calculator estimate?
It compares planetary orbital periods around the Sun.
Is this an exact mission-planning tool?
No. It is an educational calculator based on the stated constants and simplified assumptions.
How accurate is the result?
Rounded mean orbital periods are used; small differences arise depending on the astronomical epoch and convention.
What does the Planet Year Length calculate?
Compare the orbital year length of the eight planets.
Which values should I enter?
Enter Planet using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Earth years = Orbital period in days ÷ 365.2425.