TechTools

Astronomical Distance Converter

From
To
Sig. figures:

Ångström

Å

1.49598e+21

Nanometer

nm

1.49598e+20

Micrometer

μm

1.49598e+17

Millimeter

mm

1.49598e+14

Centimeter

cm

1.49598e+13

Meter

m

1.49598e+11

Kilometer

km

1.49598e+8

Foot

ft

4.90807e+11

Mile

mi

9.29558e+7

Astronomical Unit

AU

1(input)

Light-second

ls

499.005

Light-minute

lmin

8.31675

Light-hour

lh

0.138612

Light-day

ld

0.00577552

Light-year

ly

0.0000158125

Parsec

pc

0.00000484814

Kiloparsec

kpc

4.84814e-9

Megaparsec

Mpc

4.84814e-12

Gigaparsec

Gpc

4.84814e-15

Hover any row to copy the value or use it as the new input. Enable Sci notation for extreme distances.

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Convert distances across 19 units: Metric (Å, nm, μm, mm, cm, m, km), Imperial (ft, mi), and Astronomical (AU, light-second, light-minute, light-hour, light-day, light-year, pc, kpc, Mpc, Gpc). Constants: 1 AU = 1.495978707×10¹¹ m (IAU 2012); 1 ly = c × 365.25 × 86400 s; 1 pc = 648000/π AU ≈ 3.0857×10¹⁶ m. Quick-reference covers Sun-Earth, Proxima Centauri, Milky Way, Andromeda, and observable universe. Enable sci notation for Gpc-scale. 100% browser-based.

How to Use

  1. 1Type a distance value in the input field
  2. 2Select your starting unit (AU, ly, pc, km, etc.) from the From dropdown
  3. 3Select your target unit in the To dropdown
  4. 4All 19 conversions appear across Metric, Imperial, and Astronomical groups
  5. 5Hover any row to copy or use as input
  6. 6Enable Sci notation - essential for Mpc/Gpc values or Ångström comparisons
  7. 7Click ⇄ to swap From/To units
  8. 8Open the quick-reference table for solar system, stellar, and cosmological distances

Features

  • 19 units: Å, nm, μm, mm, cm, m, km, ft, mi + AU, ls, lmin, lh, ld, ly, pc, kpc, Mpc, Gpc
  • Metric, Imperial, and Astronomical groups
  • Astronomical group shown full-width in 2 columns
  • All 19 conversions shown simultaneously
  • Click any row to use as new input
  • Sci notation essential for Gpc or Å scale
  • Adjustable sig. figures (3–12)
  • Quick-reference: Sun-Earth, Proxima Cen, Milky Way, Andromeda, observable universe
  • IAU 2012 exact AU definition: 1 AU = 1.495978707×10¹¹ m
  • 100% browser-based - no server

Frequently Asked Questions

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