1 Planck mass
21.76 µgMass · definition
A theoretical scale made from physical constants. It is not a proven smallest object or a hard physical limit.
Mass
Just how heavy is 1 Planck mass?
In your hand
1 mP
1 Planck mass
A theoretical scale made from physical constants.
2.176 × 10⁻⁸ kgMass in kilograms
0 kg
Planck mass
The Planck mass is a theoretical mass scale derived from fundamental constants, significant in discussions of quantum gravity.
2.176 × 10⁻⁸ kgMass in kilograms
0 kg
Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.
A little perspective
1 Planck mass is approximately equal to the Planck mass.
Measurements, assumptions & sources +
1 Planck mass
Mass: 21.76 µg; definition.
A theoretical scale made from physical constants. It is not a proven smallest object or a hard physical limit.
Planck mass
Mass: 21.76 µg; theoretical.
A theoretical mass scale formed from fundamental constants. It is neither a universal minimum nor a universal maximum mass.
NIST — 2022 CODATA fundamental constants
The marked mass is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 1 Planck mass with the Planck mass. The notes below explain how each value was chosen.
Planck mass
21.76 µgMass · theoretical
A theoretical mass scale formed from fundamental constants. It is neither a universal minimum nor a universal maximum mass.
- Comparing
- Mass ↔ Mass
- Relative size
- 1 Planck mass is approximately equal to the Planck mass.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The Planck mass: This is a theoretical value calculated under stated physical assumptions, not a direct observation.
Mass is distinct from weight: an object’s mass stays the same as gravity changes.
2.1764 × 10⁻⁸ kgkilograms
4.7982 × 10⁻⁸ lbpounds
2.1764 × 10⁻¹¹ ttonnes
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