UnitConvConvert
Length

Convert light years to centimeters

1 ly=9.4607e17cm

Use the converter below to change any light years value into centimeters instantly — with formula, conversion table, and real-world examples.

9.4607e17

Conversion formula

Forward
centimeters = light years × 9.4607e17
Reverse
light years = centimeters × 1.0570e-18

Example: 10 ly × 9.4607e17 = 9.4607e18 cm.

About both units

From

Light Year

ly

A light year is the distance light travels in one Julian year — approximately 9.461 × 10¹⁵ meters, or 63,241 AU. It is used in astronomy to describe distances between stars and galaxies. The nearest star to the Sun, Proxima Centauri, is 4.24 light years away.

Real-world: Proxima Centauri, the nearest star beyond the Sun, is 4.24 ly away. The Milky Way is about 100,000 ly across.
Read full light year reference →
To

Centimeter

cm

The centimeter equals one hundredth of a meter and is the everyday metric unit for body measurements, clothing sizes and furniture. European clothing tags, height on ID documents and household rulers are all marked in cm. An A4 sheet is 21 × 29.7 cm.

Real-world: An average adult is 160–185 cm tall. An A4 sheet is 21 × 29.7 cm. A standard passport photo is 3.5 × 4.5 cm.
Read full centimeter reference →

Light Year to Centimeter conversion table

Common light years to centimeters values for quick reference.

Light Year (ly)Centimeter (cm)
1 ly9.4607e17 cm
5 ly4.7304e18 cm
10 ly9.4607e18 cm
25 ly2.3652e19 cm
50 ly4.7304e19 cm
100 ly9.4607e19 cm
250 ly2.3652e20 cm
500 ly4.7303e20 cm
1,000 ly9.4607e20 cm
5,000 ly4.7304e21 cm

Tips & common mistakes

Quick tips

  • The light year is a unit of distance, not time, despite the name.
  • Professional astronomers usually prefer parsecs (1 pc ≈ 3.26 ly) for precision work.
  • Light from the Andromeda galaxy takes 2.5 million years to reach us — we see it as it was 2.5 Myr ago.

Avoid these

  • Confusing light year with light second — light second ≈ 300,000 km.
  • Treating light years as time rather than distance in casual conversation.
  • Using light years for solar-system distances — use astronomical units (AU) instead.

Frequently asked questions

How many centimeters in a light year?
One light year equals 9.4607e17 centimeters.
How do I convert light years to centimeters?
Multiply the light year value by 9.4607e17 to get the equivalent in centimeters.
What is 100 light years in centimeters?
100 light years equals 9.4607e19 centimeters.
Is a light year bigger than a centimeter?
Yes. 1 light year equals 9.4607e17 centimeters, so one light year is larger.
How to convert light years to centimeters without a calculator?
Multiply by 9.4607e17 for a quick estimate; use a calculator for precise results.

Related length conversions

📊 See full comparison matrix →

More from Light Year

ly → m
1 = 9.4607e15 m
ly → km
1 = 9,460,700,000,000 km
ly → mm
1 = 9.4607e18 mm
ly → mi
1 = 5,878,606,438,399.75 mi
ly → yd
1 = 1.0346e16 yd
ly → ft
1 = 3.1039e16 ft
ly → in
1 = 3.7247e17 in
ly → nmi
1 = 5,108,369,330,453.56 nmi

More to Centimeter

m → cm
1 = 100 cm
km → cm
1 = 100,000 cm
mm → cm
1 = 0.1 cm
mi → cm
1 = 160,934.4 cm
yd → cm
1 = 91.44 cm
ft → cm
1 = 30.48 cm
in → cm
1 = 2.54 cm
nmi → cm
1 = 185,200 cm

Conversions in other categories

WeightKilogram → PoundTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower