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How much does a uranium atom weigh?

3.95 × 10⁻²⁵ kgWhich one: 3.95 × 10⁻²⁵ kg

A uranium atom has a mass of about 3.95 × 10⁻²⁵ kg.

Atomic masses converted to kilograms, for the very smallest puzzles.

How heavy is that?

• A uranium atom weighs about as much as 240 hydrogen atoms.

About the same weight

• Ant 1 mg
• Mosquito 2.5 mg
• Sesame seed 3 mg
• Housefly 15 mg

More atoms

• Water molecule 2.99 × 10⁻²⁶ kg
• Iron atom 9.27 × 10⁻²⁶ kg
• Gold atom 3.27 × 10⁻²⁵ kg