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Light Years Calculator — Free Online Calculator
Light Years solves 1 light-year = 9.461 × 10¹² km — the distance light travels in one Julian year, at c = 299,792,458 m/s. Enter your known values and the calculator solves for the rest instantly. All processing happens client-side in your browser, with nothing sent to a server. Free, unlimited, and no registration needed.
How to use Light Years
- Enter your known values in the fields.
- The result updates instantly as you type.
- Copy or note down the result.
Frequently asked questions
- What formula does Light Years use?
- 1 light-year = 9.461 × 10¹² km — the distance light travels in one Julian year, at c = 299,792,458 m/s.
- 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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