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Free Kilograms to Stones Converter

In the United Kingdom and Ireland, body weight is traditionally expressed in stones and pounds rather than kilograms alone. Converting kilograms to stones is essential for anyone moving between countries or comparing health metrics with British and Irish populations. One kilogram equals 0.157 stones.

1 kg = 0.157 st

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

Quick answer

Divide kilograms by 6.35 to get stones, or multiply by 0.1575. A 70-kilogram adult weighs approximately 11 stones. This conversion is standard for UK and Irish medical records, gym memberships, and everyday weight discussions.

Formula & method

stones = kilograms × 0.1574730444
  • kg — value in kilograms
  • st — result in stones
  • 0.1574730444 — exact conversion factor (1 kg = 0.1574730444 st)

To convert back, divide by 0.1574730444 (1 st = 6.350293 kg).

Kilograms to Stones — common values

Kilograms (kg)Stones (st)
10 kg1.575 st
20 kg3.149 st
40 kg6.299 st
50 kg7.874 st
60 kg9.448 st
70 kg11.023 st
80 kg12.598 st
100 kg15.747 st

Examples

Example 1: Light luggage
Input
10 kg
Result
1.575 st
Why
Carry-on baggage for a short trip
Example 2: A child or lightweight adult
Input
50 kg
Result
7.874 st
Why
Typical weight range for a growing teenager or smaller adult
Example 3: Average adult weight
Input
70 kg
Result
11.023 st
Why
Common baseline for fitness and health discussions in the UK
Example 4: Heavier adult or athlete
Input
100 kg
Result
15.747 st
Why
Weight range for rugby players or larger individuals

Common mistakes

  • Rounding too early. Multiply by the full factor (0.1574730444) first, then round only the final stones value.
  • Converting the wrong way. This page goes Kilograms → Stones; to go back, divide by 0.1574730444.

Frequently asked questions

How many stones is 70 kilograms?

Approximately 11 stones (or 11 st 0 lb exactly). This is a common reference weight for adults in UK health guidelines.

Why do the UK and Ireland still use stones?

Historical convention. Despite metrication in 1965, body weight and some food weights remain measured in stones and pounds in everyday British and Irish life. It's similar to how the US retained pounds despite awareness of metric.

What's the difference between a stone and a pound?

One stone equals 14 pounds. This ancient division made arithmetic easier before calculators. When converting kilograms to stones, remember 1 stone = 6.35 kilograms.

Do UK medical records use stones or kilograms?

Modern NHS (National Health Service) records typically record weight in kilograms for clinical precision, but doctors often communicate results to patients in stones, especially for body weight monitoring.

How precise is this conversion for health metrics?

It's precise to three decimal places (0.157 stones per kilogram), which is accurate enough for all health tracking and fitness assessments.

Is there a simple mental math trick for kg to stones?

A rough approximation: divide kilograms by 6.35 and round. For 70 kg, that's 70 ÷ 6.35 ≈ 11 stones. For exact conversions, use this converter.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

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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.

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