Kg To Stone Uk – Official NHS Weight Conversion Guide

Converting kilograms to stones is a practical necessity in the United Kingdom and Ireland, where body weight is commonly measured in stones and pounds. The NHS and healthcare professionals rely on this system for medical records, BMI calculations, and patient consultations.

Whether you are tracking fitness goals, updating a health record, or simply curious about your weight in the traditional UK unit, understanding the kg to stone conversion is essential. This article provides a clear, fact-based guide using official NHS sources and established conversion formulas.

How Many Kilograms Are in a Stone?

The fundamental conversion rate is fixed: one stone equals exactly 6.35029318 kilograms. For everyday use, it is commonly rounded to 6.35 kg. This value is derived from the avoirdupois system, where one stone also equals 14 pounds.

1 stone = 6.35 kg (approx.)

1 kg = 0.15747 stone (approx.)

1 stone = 14 pounds

Common reference: 60 kg = 9 stone 6 lb

Key insights

The stone is a UK imperial unit predominantly used for body weight.
NHS weight conversion charts are the trusted clinical reference in healthcare settings.
To convert kg to stones manually: multiply kg by 0.15747 to get total stones, then separate the whole number and multiply the decimal by 14 to get pounds.
Rounding is common: most calculators use 1 stone = 6.35 kg (2 decimal places), but the exact value is 6.35029318 kg.
Conversion accuracy matters for medical records where precise body weight is critical.
Stone and pounds remain the standard in UK gyms, fitness apps, and daily conversation.

Quick reference table

Value	Stones	Pounds	Approx. kg
2 stone	2	0	12.70 kg
10 stone	10	0	63.50 kg
60 kg	9	6	60 kg
70 kg	11	0.3	70 kg
80 kg	12	8.4	80 kg
90 kg	14	2	90 kg
100 kg	15	10	100 kg
65 kg	10	3	65 kg
72 kg	11	4.7	72 kg
84 kg	13	3.2	84 kg

How to Convert kg to Stone and Pounds Using a Calculator

Using an online converter is the most straightforward method. Enter your weight in kilograms, and the tool returns the equivalent in stones and pounds based on the standard formula. Many calculators also provide step-by-step results, showing the decimal stone value and the breakdown into pounds.

Conversion tip

When using a calculator, check whether it uses the exact conversion factor (6.35029318) or the rounded 6.35. For clinical or official purposes, prefer tools that reference NHS charts.

Manual method for verification

To double-check a calculator result, divide the kilogram weight by 6.35029318. The whole number is the stone count. Multiply the remaining decimal by 14 to obtain pounds. For example, 60 kg ÷ 6.35029318 = 9.448, so 9 stone, and 0.448 × 14 = 6.27 pounds, which rounds to 6 lb.

Where to find trusted converters

Reliable online tools include The Calculator Site, which offers an interactive converter with reference tables, and UnitConverters.net for a simple utility. Official NHS resources, such as the Sussex NHS weight conversion chart (PDF) and the Grampian NHS healthy weight chart (PDF), provide authoritative tabular references for clinical use.

Common Weight Conversions: kg to Stone and Pounds

The following conversions cover the most frequently searched weights in the UK. These values appear on NHS charts and are used daily in healthcare, gyms, and personal tracking.

2 stone in kg – 2 stone = 12.70 kg (exact: 12.70058636 kg)
10 stone in kg – 10 stone = 63.50 kg (exact: 63.5029318 kg)
60 kg in stone and pounds – 60 kg = 9 stone 6 lb (rounded: 9 st 6.3 lb)
80 kg in stone and pounds – 80 kg = 12 stone 8 lb (rounded: 12 st 8.4 lb)
100 kg in stone – 100 kg = 15 stone 10 lb (15.75 st)
13 kilos in stone – 13 kg = 2 stone 0.7 lb (2 st 0.7 lb)
12 stone in kg – 12 stone = 76.20 kg (exact: 76.20351816 kg)
65 kg in stone and pounds – 65 kg = 10 stone 3 lb
72 kg in stone and pounds – 72 kg = 11 stone 4.7 lb
84 kg in stone and pounds – 84 kg = 13 stone 3.2 lb

Rounding note

These conversions use standard rounding (nearest tenth of a pound or whole pound in common tables). Exact values may differ slightly when using the precise conversion factor. NHS charts typically round to the nearest half pound for clinical simplicity.

Why Is the Stone Unit Used in the UK?

The stone has deep historical roots in British and Irish culture. It predates the metric system and was standardised in the 19th century. Despite official metrication starting in the 1960s, body weight continues to be expressed in stones and pounds across healthcare, fitness, and everyday life.

How Did the Stone Unit Evolve Over Time?

Pre-19th century: The stone was used as a trade weight in various European countries, with local variations.
1835: The UK Weights and Measures Act defined the stone as exactly 14 pounds (avoirdupois).
1985: The UK stopped using the stone as a legal unit for trade, but it remained in common use for personal body weight.
Present day: The NHS and UK health services continue to use stones and pounds alongside kilograms in patient records and public health guidance.

How Accurate Is the kg to Stone Conversion?

The exact conversion factor is 1 stone = 6.35029318 kg, defined by international agreement. For most everyday purposes, rounding to 6.35 kg per stone is acceptable. However, for medical records, clinical charts use the full factor to ensure precision.

Established information

1 stone = 6.35029318 kg (exact, from NIST and UK legislation)
NHS charts use precise conversion to ensure clinical accuracy
60 kg = 9 stone 6.3 lb in exact conversion, rounded to 9 st 6 lb on NHS charts

Information that remains imprecise

Rounding practices vary between different NHS trusts (some round to nearest pound, others to nearest half pound)
Consumer calculators may use different rounding thresholds (e.g., 6.35 kg vs 6.35029318 kg)
No single official NHS calculator exists; each trust publishes its own chart

Why Do UK Health Services Still Use Stones and Pounds?

The continued use of stones and pounds for body weight in the UK is a combination of cultural habit, patient preference, and clinical continuity. Patients understand their weight better in familiar units, and healthcare professionals find it efficient for communication. NHS resources, such as the Sussex NHS weight conversion chart, are specifically designed to support this dual-system approach.

What Are the Official Sources for Weight Conversion?

The most authoritative references for kg to stone conversion in the UK come from NHS trusts and international standards bodies:

NHS Sussex – Weight Conversion Chart (PDF) – updated March 2023
NHS Grampian – Kilograms to Stones and Pounds (PDF) – sourced from Grampian Health Board
NIST – International System of Units (SI) – for the exact conversion factor (6.35029318 kg per stone)
The UK Weights and Measures Act 1835 that legalised the 14‑pound stone.

“The NHS weight calculators display weight in stones and pounds, and conversion charts are standard in UK healthcare facilities.”

— From NHS Sussex and Grampian resources

What Is the Most Reliable Method for Converting kg to Stone?

For personal use, an interactive calculator like the one on The Calculator Site provides quick results with clear breakdowns. For clinical or official purposes, downloading a verified NHS conversion chart ensures accuracy. You can also use the manual formula: multiply kg by 0.15747 for stones, then convert the remainder into pounds by multiplying by 14.

If you need to convert stones to kg or use our comprehensive weight conversion calculator, these tools are built on the same official conversion rates.

Frequently Asked Questions About kg to Stone Conversion

How many pounds are in a stone?

One stone equals 14 pounds (avoirdupois). This is a fixed conversion used in the UK and Ireland.

Is the stone unit the same in the UK and US?

Yes, the stone of 14 pounds is the same in both the UK and US, but the US rarely uses the stone unit for body weight. In the UK it remains common.

How accurate is the kg to stone conversion?

The exact conversion is 1 stone = 6.35029318 kg. Rounding to 6.35 kg per stone is typical for everyday use, but NHS charts use the full factor for clinical precision.

Why is stone used for weight in the UK?

Historical tradition and patient familiarity keep the stone in use. The NHS and fitness industry continue to use it alongside metric units.

What is the NHS weight conversion chart?

It is a PDF table published by NHS trusts (e.g., Sussex, Grampian) showing kg equivalents in stones and pounds for clinical reference. It is free to download.

How do I convert 60 kg to stone?

60 kg divided by 6.35029318 equals 9.45 stone, which is 9 stone 6.3 pounds. Rounded to the nearest pound, that is 9 stone 6 lb.

How much is 100 kg in stone?

100 kg is approximately 15.75 stone, or 15 stone 10.5 pounds. NHS charts commonly list it as 15 stone 10 lb.

What is 10 stone in kg?

10 stone equals exactly 63.5029318 kg, commonly rounded to 63.50 kg.

Can I use metric scales for UK body weight?

Yes, many digital scales allow you to switch between kg and stones/pounds. If only kg is available, use a conversion chart to get the UK value.

Do Irish health services use stones?

Yes, the Republic of Ireland also commonly uses stones and pounds for body weight, similar to the UK, especially in healthcare and fitness.