Length Converter
Convert between any length units - from quantum scale to cosmic distances with comprehensive visual feedback
Popular: Most commonly used units
Popular: Most commonly used units
Did you know about Meters?
💡 Originally defined as 1/10,000,000 of the distance from equator to North Pole
⚛️ Quantum
Planck length
1.616 × 10⁻³⁵ m
👤 Human
Average height
1.7 m (5.6 ft)
🏗️ Architecture
Burj Khalifa
828 m (2,717 ft)
🌌 Cosmic
1 Light year
9.46 × 10¹⁵ m
The meter was originally defined as 1/10,000,000 of the distance from the equator to the North Pole through Paris.
A light-year equals approximately 9.46 trillion kilometers - the distance light travels in one year.
The Planck length (1.616×10⁻³⁵ m) is the smallest length that has any meaning in physics.
One inch was historically defined as the width of a man's thumb, but is now exactly 2.54 centimeters.
The mile comes from the Latin 'mille passus' meaning 'a thousand paces' of a Roman soldier.
At the quantum scale, the very concept of distance becomes uncertain due to Heisenberg's uncertainty principle.