basic

Stellar Parallax Distance Calculator

d_pc = 1 / p_arcsec.

Compute the distance to a star from its annual parallax angle in arcseconds, using d (parsecs) = 1 / parallax_arcsec. Reports the result in pc, ly, and AU.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

arcsec

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

d (pc) = 1 / parallax_arcsec; 1 pc ≈ 3.262 ly ≈ 206,265 AU.

In depth

Compute the distance to a star from its annual parallax angle in arcseconds, using d (parsecs) = 1 / parallax_arcsec. Reports the result in pc, ly, and AU.