Planck lengths (ℓP)
The Planck length, about 1.6 × 10⁻³⁵ m, is the unit of length in the Planck system of natural units.
Convert Planck lengths to any length unit
1 Planck length = 6.3632087 × 10-34 inches
Quick facts
- Unit
- Planck length (plural: Planck lengths)
- Symbol
- ℓP
- Measures
- Length / Distance
- System
- Scientific & atomic
- Equals
- 1.616255 × 10-35 meters
- Definition
- √(ħG/c³) ≈ 1.616255 × 10⁻³⁵ m.
1 Planck length in other units
| Inches | 6.3632087 × 10-34 in |
| Meters | 1.616255 × 10-35 m |
| Centimeters | 1.616255 × 10-33 cm |
| Feet | 5.3026739 × 10-35 ft |
| Kilometers | 1.616255 × 10-38 km |
| Miles | 1.0042943 × 10-38 mi |
| Millimeters | 1.616255 × 10-32 mm |
| Yards | 1.767558 × 10-35 yd |
What is a Planck length?
The Planck length, about 1.6 × 10⁻³⁵ m, is the unit of length in the Planck system of natural units. It is far smaller than anything that can be measured: a proton is about 10²⁰ Planck lengths across. Physicists expect that quantum effects of gravity become important at this scale.
Where the Planck length sits among length units
The Planck length is number 1 of 231 on our scale of length units, ordered from smallest to largest.
Top Planck length conversions
- Planck lengths to inches
- Planck lengths to meters
- Planck lengths to centimeters
- Planck lengths to feet
- Planck lengths to kilometers
- Planck lengths to miles
- Planck lengths to millimeters
- Planck lengths to yards
- Planck lengths to micrometers
- Planck lengths to nanometers
- Planck lengths to nautical miles
- Planck lengths to light-years
Common amounts of Planck lengths
Convert Planck lengths to all 230 other units
Metric (SI)
- ℓP to m
- ℓP to cm
- ℓP to km
- ℓP to mm
- ℓP to µm
- ℓP to nm
- ℓP to dm
- ℓP to pm
- ℓP to fm
- ℓP to dam
- ℓP to hm
- ℓP to Gm
- ℓP to Mm
Imperial & US customary
- ℓP to in
- ℓP to ft
- ℓP to mi
- ℓP to yd
- ℓP to ftm
- ℓP to fur
- ℓP to hh
- ℓP to th
- ℓP to ch
- ℓP to lea
- ℓP to rd
- ℓP to cubit
- ℓP to barleycorn
- ℓP to li
- ℓP to span
- ℓP to line
- ℓP to ell
- ℓP to palm
- ℓP to Ramsden's chain
- ℓP to finger
- ℓP to nail
- ℓP to shaftment
US survey
Nautical
Astronomical
- ℓP to ly
- ℓP to au
- ℓP to pc
- ℓP to kpc
- ℓP to Mpc
- ℓP to R⊕
- ℓP to ls
- ℓP to light-minute
- ℓP to LD
- ℓP to R☉
- ℓP to Gpc
- ℓP to light-day
- ℓP to light-hour
- ℓP to RJ
- ℓP to light-week
- ℓP to Hubble length
- ℓP to siriometer
Scientific & atomic
Ancient
- ℓP to Roman mile
- ℓP to royal cubit
- ℓP to stadion
- ℓP to Biblical cubit
- ℓP to Roman foot
- ℓP to Greek foot
- ℓP to Roman pace
- ℓP to parasang
- ℓP to Egyptian common cubit
- ℓP to Egyptian digit
- ℓP to Egyptian palm
- ℓP to Gallic league
- ℓP to Greek cubit
- ℓP to Greek finger
- ℓP to Roman cubit
- ℓP to Roman digit
- ℓP to Roman inch
- ℓP to Roman palm
- ℓP to Roman stadium
- ℓP to Roman step
- ℓP to handbreadth
- ℓP to Biblical finger
- ℓP to Biblical parasang
- ℓP to Biblical span
- ℓP to Greek palm
- ℓP to Greek span
- ℓP to Sabbath day's journey
- ℓP to Talmudic mil
- ℓP to bema
- ℓP to beru
- ℓP to day's journey
- ℓP to diaulos
- ℓP to dichas
- ℓP to hippikon
- ℓP to iteru
- ℓP to khet
- ℓP to kondylos
- ℓP to kush
- ℓP to nindan
- ℓP to orgyia
- ℓP to plethron
- ℓP to pygme
- ℓP to reed
- ℓP to remen
- ℓP to shu-si
- ℓP to ush
East & Southeast Asian
- ℓP to 里
- ℓP to 尺
- ℓP to 寸
- ℓP to 尺
- ℓP to 里
- ℓP to 間
- ℓP to 寸
- ℓP to wa
- ℓP to 리
- ℓP to 丈
- ℓP to 步
- ℓP to 分
- ℓP to 厘
- ℓP to 分
- ℓP to 치
- ℓP to 町
- ℓP to 자
- ℓP to 丈
- ℓP to khuep
- ℓP to kujirajaku
- ℓP to nio
- ℓP to sen
- ℓP to sok
- ℓP to 引
- ℓP to yot
- ℓP to 厘
- ℓP to 푼
- ℓP to 毫
- ℓP to 忽
- ℓP to kraphiat
- ℓP to 毛
- ℓP to 丝
South Asian & Middle Eastern
- ℓP to gaj
- ℓP to kos
- ℓP to yojana
- ℓP to angul
- ℓP to farsakh
- ℓP to hasta
- ℓP to arsin
- ℓP to barid
- ℓP to danda
- ℓP to dhira
- ℓP to qasaba
European (pre-metric)
- ℓP to Swedish mil
- ℓP to versta
- ℓP to arshin
- ℓP to lieue
- ℓP to ligne
- ℓP to pied du roi
- ℓP to sazhen
- ℓP to toise
- ℓP to Irish mile
- ℓP to Prussian mile
- ℓP to Russian mile
- ℓP to Scottish mile
- ℓP to pouce
- ℓP to vershok
- ℓP to Danish mile
- ℓP to French point
- ℓP to Prussian ell
- ℓP to Prussian foot
- ℓP to Prussian inch
- ℓP to Prussian rod
- ℓP to Rhineland rod
- ℓP to Russian foot
- ℓP to Swiss hour
- ℓP to aln
- ℓP to aune
- ℓP to duim
- ℓP to dyuym
- ℓP to famn
- ℓP to liniya
- ℓP to pyad
- ℓP to Welsh mile
- ℓP to fjardingsvag
- ℓP to tochka
Spanish & Portuguese
- ℓP to Castilian vara
- ℓP to Spanish league
- ℓP to Texas vara
- ℓP to pulgada
- ℓP to Castilian foot
- ℓP to Mexican vara
- ℓP to braca
- ℓP to legua
- ℓP to Portuguese foot
- ℓP to Portuguese vara
- ℓP to palmo
- ℓP to polegada
- ℓP to Spanish pace
- ℓP to linea
- ℓP to linha
- ℓP to punto
Everyday comparisons
- ℓP to American football field
- ℓP to marathon
- ℓP to smoot
- ℓP to Earth circumference
- ℓP to Eiffel Tower height
- ℓP to Olympic pool length
- ℓP to banana
- ℓP to double-decker bus
- ℓP to soccer pitch length
- ℓP to Mount Everest height
- ℓP to blue whale length
- ℓP to credit card length
- ℓP to human hair width
- ℓP to Burj Khalifa height
- ℓP to Earth diameter
- ℓP to Empire State Building height
- ℓP to Statue of Liberty height
- ℓP to human height
- ℓP to giraffe height
- ℓP to grain of rice
- ℓP to paperclip length
- ℓP to pencil length
- ℓP to sheppey
- ℓP to smartphone length
Convert to Planck lengths
- Inches to Planck lengths
- Meters to Planck lengths
- Centimeters to Planck lengths
- Feet to Planck lengths
- Kilometers to Planck lengths
- Miles to Planck lengths
- Millimeters to Planck lengths
- Yards to Planck lengths
- Micrometers to Planck lengths
- Nanometers to Planck lengths
- Nautical miles to Planck lengths
- Light-years to Planck lengths
Frequently asked questions
What is a Planck length?
The Planck length, about 1.6 × 10⁻³⁵ m, is the unit of length in the Planck system of natural units.
How is the Planck length defined?
√(ħG/c³) ≈ 1.616255 × 10⁻³⁵ m.
How many inches are in a Planck length?
One Planck length equals 6.3632087e-34 inches.
How many meters are in a Planck length?
One Planck length equals 1.616255e-35 meters.
How many centimeters are in a Planck length?
One Planck length equals 1.616255e-33 centimeters.