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Free Stones to Kilograms Converter

Convert body weight between stones and kilograms. One stone is 14 pounds, or about 6.35 kg. Type in either box for an instant result.

1 st = 6.35 kg

Pick any units and edit either box — it converts instantly in your browser.

Quick answer

To convert stones to kilograms, multiply by 6.35029318, because one stone equals 14 pounds, or 6.35029318 kg. For example, 12 stone = 76.2 kg. To go back, divide kilograms by 6.35029318.

Formula & method

kilograms = stones × 6.35029318
  • stones — weight in stones
  • 6.35029318 — kilograms in one stone (14 lb)

A stone is 14 pounds, so stones × 14 gives pounds.

Common stones to kilograms

Stones (st)Kilograms (kg)
1 st6.35 kg
5 st31.75 kg
8 st50.80 kg
10 st63.50 kg
11 st69.85 kg
12 st76.20 kg
15 st95.25 kg
20 st127.01 kg

Examples

Example 1: 1 stone
Input
1 st
Result
6.35 kg
Why
1 × 6.35029318 = 6.35.
Example 2: 10 stone
Input
10 st
Result
63.5 kg
Why
10 × 6.35029318 = 63.50.
Example 3: 12 stone
Input
12 st
Result
76.2 kg
Why
12 × 6.35029318 = 76.20.

When to use this tool

  • Converting body weight between UK stones and metric kilograms.
  • Filling in a health form that uses the other unit.
  • Comparing weight figures across regions.

Common mistakes

  • Forgetting the pounds part. Body weight in the UK is often given as “11 stone 4,” meaning 11 stone plus 4 pounds.
  • Treating a stone as 10 pounds. It’s 14 pounds.
  • Rounding 6.35 too hard for medical contexts where precision matters.

Frequently asked questions

How do I convert stones to kilograms?

Multiply the stones by 6.35029318. For example, 9 stone × 6.35 ≈ 57.2 kg.

How many kilograms is one stone?

About 6.35 kilograms, because a stone is exactly 14 pounds.

How do I handle stones and pounds together?

Convert the stones to pounds (× 14), add the extra pounds, then convert pounds to kilograms (× 0.45359237).

How do I convert kilograms back to stones?

Divide the kilograms by 6.35029318, or type a value into the kilograms box here.

Why is the stone still used?

It remains common for body weight in the UK and Ireland, even though most other measurements there use the metric system.

Is the stone unit used anywhere outside the UK?

Primarily the UK and Ireland for body weight. Most other Commonwealth nations and the world use kilograms. It remains a cultural holdover in British health contexts.

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  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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