Light Year Converter
Converts an astronomical distance between light-years, astronomical units, parsecs, kilometers, and miles. 1 AU converts to 149597870.7 km.
What this calculator does
The Light Year Converter estimates your result instantly from the values you enter, using standard math & conversions formulas. Converts an astronomical distance between light-years, astronomical units, parsecs, kilometers, and miles. 1 AU converts to 149597870.7 km. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About Light Year Converter
The Light Year Converter changes an astronomical distance from one unit to another across five units: light-years, astronomical units, parsecs, kilometers, and miles. Choose the From and To units and enter the distance.
Formula & Mathematical Calculation
Converted Value = f(Distance, From, To)
Calculated according to standard math formulas implemented in the calculator core.
Calculation Example
Enter 1, set From to AU and To to km, then click Calculate. The Converted Value box shows:
149597870.7 km
The note reads: 1 AU equals 149597870.7 km.
Key Benefits
- Converts between five astronomical distance units
- Supports light-years, AU, parsecs, kilometers, and miles
- Uses precise base factors in meters
- Shows the result to six decimals with the target unit
How to Use this Calculator
-
Enter the distance
Type the distance into the Distance field. -
Choose units
Select the source unit in From and the target unit in To. -
Calculate and read
Click Calculate and read the Converted Value box.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Light Year Converter produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.