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Orbital Period Calculator — Free Online Calculator

Orbital Period solves T = 2π√(a³/GM) — T = orbital period, a = semi-major axis, G = gravitational constant, M = central mass — Kepler's third law. Enter your known values and the calculator solves for the rest instantly. Everything is computed locally in your browser — your data never leaves your device. Completely free, with no account required.

How to use Orbital Period

1. Enter your known values in the fields.
2. The result updates instantly as you type.
3. Copy or note down the result.

Frequently asked questions

What formula does Orbital Period use?

T = 2π√(a³/GM) — T = orbital period, a = semi-major axis, G = gravitational constant, M = central mass — Kepler's third law.

Can I use it on my phone?

Yes. The layout adapts to small screens and behaves the same on mobile as on desktop.

Is my input saved anywhere?

No. Values stay in your browser and are gone as soon as you close the tab.

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