How many kilograms are in 1 slug?

1 slug = 14.593902937 kilograms, based on 1 slug = 32.174 lbm at standard gravity.

Can I convert kilograms back to slugs?

Yes. This tool also converts kg to slugs using slug = kg ÷ 14.593902937.

Where is the slug unit used?

The slug is an Imperial unit of mass used mainly in engineering and physics contexts in the US, especially when force is in pound-force and acceleration is in ft/s².

Slug to kg Converter – convert slugs to kilograms (and kg to slugs)

Slug to kg Converter

Convert slugs to kilograms and kilograms to slugs using the standard engineering definition: 1 slug = 14.593902937 kg. This is useful when you’re moving from Imperial/US customary mechanics to SI-based calculations.

Slug US imperial mass

Kilogram (kg) SI

1 slug → 14.593902937 kg

Common slug → kg conversions

Slugs	Kg	Notes
0.5	7.296951	Half slug
1	14.593903	Standard slug
2	29.187806	≈ 29.19 kg
5	72.969514	Medium mass
10	145.939029	~146 kg

Formula

kg = slug × 14.593902937

slug = kg ÷ 14.593902937

This factor comes from: 1 slug is the mass that accelerates 1 ft/s² when acted on by 1 lbf; using standard gravity and lbm definitions you get 1 slug ≈ 32.174 lbm ≈ 14.5939 kg.

Example

You have 3.2 slugs:

3.2 × 14.593902937 = 46.700... kg

To go backwards, 50 kg ÷ 14.593902937 = 3.426 slug

When do I see “slug”?

In some engineering textbooks or aerospace problems that use feet, seconds, and pounds-force, the slug is used to make F = m × a “work nicely”. If you need to report in SI, just plug the slug value here and get kg.