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About this tool
Convert light-years to miles instantly. Free, bidirectional, and fully in-browser.
1 light-year equals 5.878625e+12 miles — enter any light-year value to convert it to miles instantly. This Light-year to Mile converter is a client-side tool: it applies a single multiplication (mi = ly × 5.878625e+12) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert miles back to light-years. A reference table lists common light-year values already converted, and nothing you enter is sent to a server.
Open Light-year to Mile Converter on AltFTool — it loads instantly in your browser.
Type the value you want to convert into the Light-year field.
Read the equivalent in miles in the result field, and copy it if needed.
Use the decimal-places slider for more or less precision, or press swap to convert miles to light-years.
The result updates as you type, and the swap button flips the conversion to mile → light-year without reloading.
The conversion uses the precise factor (mi = ly × 5.878625e+12), so the number matches a manual calculation to the decimal places you choose.
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Everything runs locally in your browser — no upload, no account, no limit on conversions.
One light-year is 5.878625e+12 miles. Multiply the light-year value by 5.878625e+12 to convert. For example, 10 ly = 5.878625e+13 mi.
mi = ly × 5.878625e+12. This tool applies it automatically and shows a worked example: 10 ly = 5.878625e+13 mi.
Yes. Press the swap button, or type into the mile field, and the tool converts miles to light-years using the inverse of the same relationship.
It uses the standard distance and length definition (mi = ly × 5.878625e+12), not a rounded approximation, so results are exact to the number of decimal places you select.
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Add the Light-year to Mile Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
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