Light Year Converter
Light Year Converter
1 ly = 9.461 × 10¹² km
What is the Light Year Converter?
Light Year Converter convert light years to kilometers, au, and parsecs. It is part of Home of Calculators's Astronomy Calculators suite for orbital mechanics, stellar properties, and cosmological calculations. The calculator is designed for astronomers, students, space enthusiasts, but anyone can use it. No signup, no ads, no tracking. Just accurate math, computed locally in your browser using a BigNumber-precision math engine.
A light-year is the distance that light travels in one year in a vacuum. Since light moves at 299,792 km/s, one light-year equals approximately 9.461 trillion kilometers or 63,241 astronomical units.
cSpeed of light (299,792 km/s)tOne year (31,536,000 s)How to use the Light Year Converter
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Understand the unit
One light-year = speed of light × seconds in one year.
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Convert to kilometers
Multiply light-years by 9.461 × 10¹² to get kilometers.
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Convert to parsecs
Divide light-years by 3.262 to get parsecs.
Quick tips
- All calculations run locally in your browser; your data never leaves your device.
- For best results on mobile, rotate to landscape when entering many values.
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Why Home of Calculators
- 100% private (calculations run in your browser)
- 128-bit BigNumber precision (no rounding errors)
- Works on any device: phone, tablet, desktop
- Free forever (no signup, no ads, no upsells)
Frequently asked questions
Is the Light Year accurate?
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Yes. Home of Calculators uses a BigNumber-precision math engine (64-128 decimal digits) to ensure calculations are accurate. We run 96+ automated tests covering unit conversion, financial formulas, health formulas, and more. For critical decisions (financial, medical, legal), we still recommend consulting a qualified professional.
Is the Light Year Converter free?
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Yes. Every calculator on Home of Calculators is 100% free, with no signup, no ads, and no hidden fees. The entire platform is free forever.
Do you store the values I enter?
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No. All calculations happen in your browser. We never see, store, or transmit your inputs to any server. Your data stays on your device.
Can I use the Light Year on my phone?
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Yes. Home of Calculators is fully responsive and works on any device (phone, tablet, laptop, or desktop). The interface adapts to your screen size.
Can I embed this calculator on my own website?
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Yes. Click the "Share" button to get an iframe embed code. The embedded calculator will look like any other Home of Calculators widget. You can also build a fully customized version using our visual builder.
Can I build my own custom calculator?
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Absolutely. Home of Calculators's visual builder lets you add fields, write formulas, choose a theme, and brand the result with your own logo, all without writing code.